London Marathon Training Plan 2027: Course Guide, Pacing Strategy & Race Day

The TCS London Marathon is the largest marathon in the world by finisher count. In 2025, 56,640 runners crossed the line, setting a Guinness World Record. The same race raised £87.3 million for charity in a single day and produced Tigst Assefa's women's-only world record of 2:15:50. The public ballot for 2026 drew more than 1.1 million applications, a staggering little data dragon that tells you exactly how badly runners want this start line.

The 2027 TCS London Marathon is scheduled for Sunday, April 25, 2027. London Marathon Events has also said it is exploring a possible one-off two-day format for 2027, so runners should confirm the final format once the event structure is formally announced.

The course itself is iconic almost to the point of absurdity: Blackheath, Greenwich, the Cutty Sark, Tower Bridge, Canary Wharf, Rainbow Row, the Tower of London, the Embankment, Big Ben, Birdcage Walk, Buckingham Palace, and The Mall. It is a city tour with a finish line dressed in royal theatre.

It is also one of the most misunderstood fast courses in the World Marathon Majors. London is flat. London is fast. London is absolutely capable of producing a PR. But London also has one of the most dangerous opening terrain patterns in major marathoning: a crowded start, a merge near mile 3, and then a sustained downhill through Charlton that makes goal pace feel laughably easy while quietly charging interest to your quads.

This guide is the honest version of the course. The famous danger is not the finish. It is not Tower Bridge. It is not even Canary Wharf. It is the early descent you will barely notice unless you know what it is doing.

London Marathon at a Glance

• Race: TCS London Marathon
• 2027 date: Sunday, April 25, 2027
• Start: Three colour-coded starts around Blackheath and Greenwich Park
• Finish: The Mall, St James's Park, Central London
• Course type: Point-to-point, southeast London to central London
• Starts: Red Start, Blue Start, and Green Start, merging near mile 3 in Woolwich
• Total elevation gain: Approximately 75 metres / 246 feet
• Biggest terrain feature: The Charlton descent between roughly km 5 and 7
• Key landmarks: Blackheath, Woolwich, Cutty Sark, Tower Bridge, Isle of Dogs, Canary Wharf, Rainbow Row, Tower of London, Blackfriars, Victoria Embankment, Big Ben, Birdcage Walk, Buckingham Palace, The Mall
• Fueling on course: BUXTON water, Lucozade Sport at miles 7, 15, 21, and 23, and Lucozade gels at miles 13 and 19
• Free race-day travel: Runners can travel free on Transport for London services by showing their bib
• BQ course: Yes, fast and certified
• Best training block: 16 to 18 weeks beginning in late December or early January
• Best single race-day instruction: Run the Charlton descent at goal pace, not at the pace your fresh legs are begging for.

The Course's Hidden Structure

On a map, London looks simple: start in southeast London, drift west, cross Tower Bridge, loop around the Isle of Dogs and Canary Wharf, then come home along the Embankment to The Mall.

That map is useful for spectators. It is not the map that matters for pacing.

The pacing map has two main features: the Charlton descent and the Embankment reckoning.

The Charlton descent: the early debt machine

After the three start routes merge near Woolwich, the course drops from the Blackheath plateau toward Greenwich. Between roughly kilometres 5 and 7, the course loses meaningful elevation in a steady, runnable, deceptively generous descent. The road is wide. The legs are fresh. The crowds are starting to swell. Your watch may show goal pace while your body reports that you are jogging through a postcard.

This is the trap. The descent feels free, but downhill running is never free. It loads the quadriceps eccentrically, especially if you overstride or chase the pace the hill offers. That cost does not always appear immediately. It appears later, around miles 20 to 24, when the course is flat and your legs suddenly feel like someone swapped your quads for wet sandbags.

The Embankment: where London collects

The Embankment from roughly miles 23 to 25 is flat, wide, and spectacular. It should be fast. For runners who managed Charlton, Tower Bridge, and Canary Wharf, it can be.

For runners who spent too much early, the Embankment is where the bill arrives. The road opens up. The finish is close but not close enough. Big Ben appears in the distance like a very grand stopwatch. The crowd is huge, but the legs are now giving sworn testimony about every early mistake.

Course Profile: Three Starts, One Descent, and What Actually Costs You

The three-start system

The London Marathon uses three start areas to manage an enormous field: Red, Blue, and Green. The Red Start is associated with Greenwich Park, while the Blue and Green Starts are on or near Blackheath. Each start is divided into zones based on predicted finish time, and all three starts merge near mile 3 in Woolwich.

This matters because the first 5K is not a clean, empty stretch of road. It is crowded, emotionally charged, and full of small decisions. Weaving around runners feels productive in the moment and foolish later. The first strategic win of the day is not a fast first mile. It is arriving at mile 3 without having spent unnecessary energy.

The elevation arithmetic

London's total elevation gain is modest: roughly 75 metres. The finish is slightly lower than the start. That is why London supports fast times and why elites treat it as a legitimate record course.

But the course is not evenly flat. The biggest drop comes early, and that concentration matters. A course that gently descends over 26 miles is one thing. A course that drops meaningfully in the first 7K, while the field is still sorting itself out and the adrenaline is still fizzing, is another creature entirely.

What actually costs you

The terrain cost of London is not the total climbing. It is the combination of:

• crowded opening miles that invite weaving
• the Charlton descent that invites overpacing
• Cutty Sark and Tower Bridge crowd noise that invites surging
• Canary Wharf GPS drift that invites panic-pacing
• the long, exposed psychological demand of the Embankment

The course is fast for the runner who refuses every early invitation.

Course Breakdown: Blackheath to The Mall

Miles 0 to 3: Blackheath, Greenwich, and the Merge

The London Marathon begins on Blackheath and around Greenwich Park, with runners divided across three start areas. This start is unlike a single-line American marathon start where everyone funnels forward from one boulevard. London is more like releasing three rivers into the same channel and asking them to behave politely.

The first miles are crowded but manageable. Your job is simple: stay calm, hold back, avoid weaving, and accept that the clean rhythm of the race may not fully arrive until after Woolwich. The course will open. You do not need to solve congestion in mile 1 like a caffeinated pinball.

Bring a throwaway layer for the wait. Blackheath can feel colder and windier than central London, especially while you are standing still. A cheap fleece, old long sleeve, or plastic poncho is not optional cleverness. It is race-morning sanity.

Miles 3 to 7: Woolwich, Charlton, and Cutty Sark

After the merge near Woolwich, the course begins the most important section of the race: the descent through Charlton toward Greenwich.

This is where London can make you stupid. The roads are fast. The legs are fresh. The gradient gives you speed without apparent effort. The crowd is now properly awake. Everything around you says, "Take the free pace."

Do not take it.

If your goal pace is 8:00 per mile, run 8:00 per mile. If your goal pace is 8:35, run 8:35. If the descent gives you 8:10 at 8:35 effort, back off until the watch and the body agree. The point is not to feel strong at mile 6. Everyone feels strong at mile 6. The point is to have quads that still answer emails at mile 23.

At approximately mile 6.5, the course wraps around the Cutty Sark in Greenwich. This is one of the first true London thunderclaps: huge crowd, narrow road, landmark directly in front of you, cameras everywhere. The Cutty Sark is an 1869 tea clipper, now dry-docked in Greenwich, and the turn around it is one of the course's signature images.

Enjoy it. Do not surge through it. If you want a photo, move to the side. Stopping mid-pack here is how little race-day avalanches are born.

Miles 7 to 12: Deptford, Rotherhithe, Bermondsey, and Tower Bridge

After Greenwich, the course threads through Deptford, Rotherhithe, Canada Water, and Bermondsey. The energy dips slightly after Cutty Sark before building again toward Tower Bridge. This is a useful stretch. It lets you settle into marathon pace after the early sensory fireworks.

The first Lucozade Sport station is at mile 7. Take it if you have trained with it or if it fits your fueling plan. At minimum, take water. This is early enough that skipping feels harmless and late enough that the cost starts to matter.

By mile 10, the Tower Bridge approach begins to announce itself. Charity crowds get thicker. Noise rises. The city feels as if it has begun leaning toward the road.

Mile 12: Tower Bridge

Tower Bridge is the London Marathon's great cathedral moment.

The bridge itself was built between 1886 and 1894, with twin Victorian Gothic towers rising above the Thames. On marathon day, it becomes less like infrastructure and more like a sound machine. The crowd is stacked on both sides, the river is underneath, the skyline is ahead, and the emotional voltage is high enough to power a small borough.

This is the second major pacing trap after Charlton. The body will want to sprint because the crowd tells the body it is starring in a film. The bridge rises slightly, the halfway point is near, and the adrenaline will make planned pace feel too slow.

Hold pace. Tower Bridge is for goosebumps, not for borrowing seconds.

Miles 13 to 17: The Highway and the Isle of Dogs

After Tower Bridge, the course turns east along The Highway. Runners pass outbound and inbound on opposite sides of the road, creating one of London's stranger psychological mirrors: runners at mile 13 can see runners at mile 22 heading back toward central London.

The first Lucozade gel station is at mile 13. If you have trained with Lucozade gels, take it. If not, use your own gel here instead. Do not wait until hunger appears. Hunger is not a reliable marathon dashboard light.

The Isle of Dogs loop is quieter than the landmarks on either side. This is not a bad thing. It is a working stretch. You are not being entertained; you are executing. Hold pace, fuel on schedule, avoid emotional drift, and let the towers of Canary Wharf ahead act as the next visual anchor.

Miles 18 to 20: Canary Wharf and the GPS Problem

Canary Wharf is London's financial district: tall glass, hard corners, reflected noise, crowd pockets, and watch chaos. GPS pace can become unreliable here because the buildings interfere with satellite signal. Your watch may briefly claim you are flying, crawling, or performing an avant-garde zigzag through a bank lobby.

Do not obey the watch blindly in Canary Wharf. Use official mile markers, elapsed time, lap splits, effort, cadence, and the pace group around you. If your watch suddenly says you dropped a 6:50 mile at marathon effort, you probably did not become Kelvin Kiptum in the shadow of HSBC.

The crowd in Canary Wharf has become much stronger in recent years. It can feel like a modern scream tunnel: glass, echo, and adrenaline. Enjoy the energy, but keep the leash short. The Embankment is still ahead.

Mile 21: Rainbow Row

Rainbow Row in Limehouse is a 250-metre stretch celebrating the LGBTQIA+ community and inclusion within the London Marathon. It arrives at a perfect moment: late enough that the race is genuinely hard, early enough that you still need a push before the final grind.

This is one of the course's best emotional injections. Take the energy. Keep the pace controlled. The line between being lifted and being launched is thin at mile 21.

Miles 22 to 23: Tower Hill, The Highway Return, and Blackfriars

At mile 22, the course passes back toward Tower Bridge and the Tower of London. The skyline layers itself in ridiculous fashion: Tower Bridge, the Tower, the Shard, the City towers, the river. Even deep in the race, this section can pull you out of your own suffering for a few seconds.

Then comes the small rise near Blackfriars. It is not dramatic on paper. At mile 23, paper is irrelevant. Shorten stride, maintain cadence, and do not let a modest rise become a mental catastrophe. This is London's final little terrain jab before the road opens onto the Embankment.

Miles 23 to 25: Victoria Embankment

Victoria Embankment is the truth serum.

The road is wide. The Thames is beside you. Charity cheer zones line the route. Big Ben starts to appear ahead. You are close enough to feel the finish but far enough that pretending you are done will wreck you.

If you managed the race correctly, this is where you can begin to build. Not a wild surge, not a cinematic sprint, but a controlled squeeze. Ten seconds per mile faster. Then another few if the body agrees. The Embankment rewards the runner who still has rhythm.

If you mismanaged Charlton, Tower Bridge, or Canary Wharf, this is where the course becomes very honest. There is nowhere to hide on a wide road next to a river. It is just you, the crowd, the clock, and whatever you brought from the first 22 miles.

Miles 25 to 26.2: Westminster, Birdcage Walk, Buckingham Palace, and The Mall

The course turns near Westminster and Big Ben, then enters Birdcage Walk alongside St James's Park. This is the beginning of the finish sequence and one of the great final miles in marathon running.

Birdcage Walk is loud, emotional, and strangely endless for a road that is objectively not endless. The crowds are close. The park is on one side. The finish is near, but the body is negotiating every step.

Then comes the turn at Buckingham Palace.

The Mall opens in front of you: flags overhead, Palace behind, finish gantry ahead, crowd packed along the barriers, red road underfoot. It is a 930-metre ceremonial runway and one of the finest marathon finishes on earth. This is where you spend everything. No more conserving. No more bargaining. Run the blue carpet equivalent. The city has saved its best theatre for last.

London Marathon Pacing Strategy

London's pacing strategy is not complicated. It is just emotionally difficult. The course gives you three chances to do something foolish: Charlton, Tower Bridge, and Canary Wharf. Your job is to decline all three invitations.

Phase 1: Miles 0 to 3 — patient sorting

Start controlled. Let the field sort itself. Do not weave. If mile 1 is a few seconds slow, that is fine. London is not lost by running mile 1 five seconds slow. It is often lost by trying to fix that five seconds with panic geometry.

Phase 2: Miles 3 to 7 — exact pace on the Charlton descent

This is the most important pacing section of the race. Run your planned pace exactly. Avoid overstriding. Keep cadence compact. Let the downhill feel restrained. The correct pace may feel too easy. That is the point.

Phase 3: Miles 7 to 13 — steady through Cutty Sark and Tower Bridge

Settle after Cutty Sark. Take Lucozade Sport at mile 7 if it fits your plan. Keep pace even through Bermondsey. Tower Bridge should be emotionally huge and physically boring. If the bridge split is faster than planned, you got tricked.

Phase 4: Miles 13 to 21 — execute through Isle of Dogs and Canary Wharf

Take the mile 13 gel or your own gel. Use internal pacing through the quieter Isle of Dogs. In Canary Wharf, demote GPS pace from boss to intern. Use effort and mile markers. Take Lucozade Sport at mile 15 and prepare for the mile 19 gel.

Phase 5: Miles 22 to 26.2 — build if you earned it

At mile 22, assess honestly. If the legs are intact, begin a progressive build. If they are not, protect form and keep moving. The Embankment is long enough to punish panic but short enough to reward discipline. Once you turn onto The Mall, spend the account.

Sample pacing framework for a 3:45 London Marathon

Use the Pace Perfect pacing calculator to build your London splits →

How to Train for London

London does not require mountain legs. It requires control: downhill control, flat-course restraint, and the ability to run your plan while 750,000 spectators try to turn you into a golden retriever at a birthday party.

1. Train the Charlton descent

The most London-specific training stimulus is controlled downhill running. You do not need brutal downhill repeats, but you do need regular exposure to sustained descent at marathon effort.

Beginning around week 5 or 6 of a 16 to 18 week plan, include controlled downhill work every 10 to 14 days. The goal is not to bomb downhill. The goal is to run smoothly at goal effort while keeping cadence quick and stride compact.

• 3 to 5 km continuous downhill at −2% to −4% grade
• Long runs with early downhill sections followed by sustained marathon-pace work
• Strength work that builds eccentric quad tolerance

The key is what happens after the downhill. London does not ask whether you can run downhill. It asks whether you can run downhill early and still have legs on the Embankment.

2. Build flat-course pacing discipline

London's non-downhill miles are largely flat. Flat marathons reward even pacing, but they also expose tiny errors. A pace that is 10 seconds too fast can feel harmless for a long time. Then the bill arrives in one lump.

Include long blocks at exact marathon pace. Not "about marathon pace." Exact. Train the skill of letting the number be boring.

3. Practice crowd-proof pacing

London is loud in a way that can scramble effort perception. Tower Bridge, Canary Wharf, Rainbow Row, and The Mall all generate pace surges if you let emotion drive the legs.

Practice this in training by doing marathon-pace segments in noisy or distracting environments: busy paths, group runs, park loops, race-pace workouts with other runners nearby. The skill is not just physical. It is behavioural.

4. Prepare for GPS failure

In Canary Wharf, GPS can lie. Practice using lap buttons at known markers. Learn what marathon effort feels like by breathing, cadence, and form rather than live watch pace. A runner who can only pace from the watch is vulnerable in London's urban canyon.

5. Strength train for the final 10K

London's late miles are not hilly, but they punish unstable form. Prioritise:

• eccentric quad work: step-downs, split squats, controlled downhill strides
• calf endurance for flat-course rhythm
• glute strength for posture late in the race
• core stability for the Embankment and Birdcage Walk

Weather: April in London

Late April in London can be perfect, damp, windy, sunny, cold at the start, or all of these before breakfast. The race's weather is not extreme by global marathon standards, but it is variable enough that a single-plan kit strategy is foolish.

The typical case

Most years bring cool spring marathon conditions: roughly 8 to 14°C / 46 to 57°F in the morning, warming slightly through the day. These are excellent running temperatures if cloud cover holds and wind stays modest.

The Blackheath problem

The start area is colder than the finish area feels in your imagination. You will stand around before running. You may be on exposed heathland. You may have wind. Bring throwaway clothing and gloves. This is not where to demonstrate minimalism.

The warm outlier

London can have warm April race days. If race morning is forecast to rise above 18°C / 64°F during your expected finish window, adjust your pace and be more deliberate with fluids. The Embankment can feel materially warmer than Blackheath, especially in sun.

The rain scenario

Rain is normal enough that it should be trained for. Wet roads around turns, wet shoes, wet charity vests, and wet throwaway clothing are all part of the possible London experience. A cap or visor is useful in rain, even in cool temperatures.

Use the marathon weather adjustment calculator →

Fueling: The London-Specific Plan

London's course nutrition is generous in fluids and sparse in gels. That distinction matters.

What the course provides

• BUXTON water: every three miles from mile 3 to mile 12, then every two miles from mile 12 to mile 24
• Lucozade Sport: miles 7, 15, 21, and 23
• Lucozade gels: miles 13 and 19

Two gel stations is not enough for most runners. A 3:30 to 4:30 marathoner generally needs more than two carbohydrate hits across the full race. Carry your own primary gels and treat course gels as backup or supplement unless you have trained with Lucozade specifically.

The key London fueling mistake

The mistake is assuming the official gel stations solve the plan. They do not. They are useful, but they are not complete.

If you normally take a gel every 30 to 35 minutes, London's mile 13 and mile 19 gel stations are too late and too far apart to be your only strategy. You need to enter the race with gels already on your person.

Recommended London fueling schedule

Plan your London Marathon fueling strategy →

Mental Strategy for Race Day

Miles 0 to 7: Blackheath to Cutty Sark

"Cold start. Crowded roads. Merge at Woolwich. Charlton descent. Run the number, not the feeling."

The first 7 miles are about restraint. You are not trying to feel amazing. You are trying to feel boringly correct. Cutty Sark is the first emotional reward. Take it without spending pace.

Miles 7 to 13: Bermondsey to Tower Bridge

"Settle. Lucozade at 7. The crowd builds. Tower Bridge is noise, not permission."

Tower Bridge is unforgettable. It is also a trapdoor with flags. Run across it like a professional, not like a Labrador released into a tennis ball warehouse.

Miles 13 to 21: Isle of Dogs, Canary Wharf, Rainbow Row

"Quiet miles. Gel at 13. GPS lies in Canary Wharf. Mile markers tell the truth. Rainbow Row gives energy."

This is the working section. You will not be carried by landmarks every minute. This is where the race becomes execution instead of sightseeing.

Miles 22 to 26.2: Tower Hill, Embankment, Westminster, The Mall

"Blackfriars rise. Embankment opens. Big Ben ahead. Birdcage Walk. Palace turn. The Mall. Spend it."

The final sequence is one of the great closing acts in sport. If you have saved enough, build from the Embankment. If you have not, hold form and let the crowd tow you home. Once you see Buckingham Palace, the thinking is over.

Logistics: Blackheath Start, Free Travel, and The Mall Finish

Getting to the start

Runners travel free on Transport for London services on race day by showing their bib. This includes the Underground, Overground, DLR, and buses. Use it. Driving to the start is a bad idea wrapped in road closures.

Most runners travel by train or DLR toward Blackheath, Greenwich, Maze Hill, or Cutty Sark depending on their assigned start. Plan the exact route after you receive your start colour. Add more time than the journey planner suggests because thousands of runners are doing the same thing with the same nervous bladder math.

The Running Show and bib collection

Race pack collection is at the TCS London Marathon Running Show at ExCeL London. Bib collection is in person. Go early if possible. Saturday is busiest, and spending hours on your feet the day before a marathon is the kind of avoidable nonsense that deserves a small fine.

Where to stay

The best hotel zones depend on your priorities:

• London Bridge / South Bank: excellent for start access and reasonable finish access
• Westminster / St James's: best for finish-line convenience
• Canary Wharf: easy race-weekend logistics and hotels near the course, but farther from the finish
• Greenwich: close to the start but less convenient after finishing

Spectator planning

London's spectator crowds are enormous. Supporters should choose exact landmarks, not vague locations. "Tower Bridge" is not a plan. "North side of Tower Bridge, west pavement, near the first tower" is a plan.

Good spectator locations include Cutty Sark, Tower Bridge, Canary Wharf, Rainbow Row, Tower Hill, and Victoria Embankment. Post-finish mobile signal can be terrible. Pick a physical meeting location in advance.

After the finish

The finish area around The Mall is controlled and crowded. Keep walking after the line, collect your medal, bag, and supplies, then move toward your pre-arranged meeting point. The emotional whiplash of finishing London is real: one minute you are on The Mall, the next you are trying to remember which lettered family meeting zone your people chose. Write it down.

Build Your London Marathon Training Plan

A strong London plan prepares for the actual race: the cold Blackheath wait, the crowded merge, the Charlton descent, the Tower Bridge surge risk, Canary Wharf GPS drift, sparse gel stations, and the final Embankment-to-Mall push.

FAQ

Is the London Marathon actually fast?

Yes. London is one of the fastest World Marathon Majors: sea-level, net downhill, and usually run in cool spring conditions. It has produced world records and world-leading performances. For everyday runners, the biggest risk is not the course being too hard. It is the course feeling too easy too early, especially on the Charlton descent.

What is the Charlton descent and why does it matter?

The Charlton descent is the early downhill section after the starts merge near Woolwich, roughly between kilometres 5 and 7. It drops off the Blackheath plateau toward Greenwich. It feels effortless and can tempt runners into banking time. The problem is eccentric quad loading: the downhill damage often appears much later, especially on the Embankment.

Why does GPS go wrong in Canary Wharf?

Canary Wharf's tall buildings interfere with GPS signals, creating unreliable live pace readings. Watches may show sudden pace spikes or slowdowns that do not match actual effort. Use official mile markers, elapsed time, cadence, and perceived effort through Canary Wharf.

Should I carry my own gels for London?

Yes. The course provides Lucozade gels at miles 13 and 19 only. That is too sparse for most marathon fueling strategies. Carry your own primary gels and use course gels only if you have trained with them.

What are the best spectator spots?

Cutty Sark and Tower Bridge are the biggest early landmarks. Canary Wharf is useful because spectators can often see runners more than once. Rainbow Row is loud and late enough to matter. The Embankment is emotionally powerful because runners are deep into the final miles. The finish area near The Mall is iconic but crowded and logistically harder.

How do runners get to the London Marathon start?

Runners use public transport. Race participants travel free on Transport for London services on race day by showing their bib. The exact best station depends on start colour, but runners commonly use Blackheath, Greenwich, Maze Hill, or Cutty Sark access routes.

When is the 2027 London Marathon?

The 2027 TCS London Marathon is scheduled for Sunday, April 25, 2027. Organizers have also explored a possible one-off two-day format for 2027, so runners should confirm the final race format with London Marathon Events.

What makes The Mall finish special?

The final turn at Buckingham Palace leads onto The Mall, a ceremonial avenue lined with flags and packed with spectators. The finish gantry is visible from the turn. It is one of the most dramatic marathon finishes in the world because the visual sequence is so clean: Palace, flags, red road, crowd, finish.

Use the London Marathon pacing calculator to build your splits →