London Marathon
training plan
An adaptive marathon plan for a flat course on road, run in cool April conditions, built around the three things London actually asks of you: a flat, fast profile, a mass field and a charity place and its fundraising. Sixteen weeks written two at a time, from what you actually did in the two weeks before, and rewritten the moment you travel, get ill or something starts hurting.
This page describes the race and what its course, climate and date ask of a build. On Pro, the plan itself is written for you, from your experience, your weekly hours and your date, so two athletes entered in this race get different plans.
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Three demands, three answers
A generic 16-week marathon plan gets you to the start line. It has no idea about a flat, fast profile, a mass field or a charity place and its fundraising.
On the ground, London is a flat course on road, with 50 m of climbing in it. It is usually held in April, when conditions are usually cool, which is good racing weather but means a cold twenty minutes standing about beforehand. So over a marathon, pacing discipline decides your day, and the weather is more likely to help you than to hurt you. There will be forty thousand and up starters out there with you.
- Profile
- Flat · road
- Climbing
- 50 m · 1.9 m in every mile
- Usual conditions
- April · cool
- Race season
- Spring, northern hemisphere
- Field
- Massive · forty thousand and up
Flat and fast means nowhere to hide
A flat course is where people chase a time, which is exactly why it punishes an optimistic first hour. There is no terrain to break the rhythm and no hill to excuse a slow split. It is the same pace, repeated, for the whole distance.
Long blocks at goal pace inside the long session, and a taper built to arrive sharp as well as rested. A pace check tells you whether your recent training supports the number you typed in.
The first miles belong to the crowd
A field this size means corrals, a start that takes minutes to clear, and an opening section run at whatever pace the people around you have chosen. Weaving costs more than it looks like it does.
Race-week guidance for a crowded start and an opening section paced deliberately conservatively, so the time you give away early on London is time you get back later.
The fundraising is a second job alongside the training
A charity place comes with a target, a deadline and a lot of evenings. It is time and energy taken from exactly the weeks the build needs most, and it does not move for a bad training week.
Tell the plan how many hours you really have and it fits the build inside them. When a week disappears entirely, it rebuilds instead of leaving you behind a schedule you never agreed to.
Getting in, and getting to the line
Adaptlete has no involvement in entry, allocation or ballots for any race. This is what the format asks of your planning.
Ballot or charity place
Most places come through a ballot or a charity team, and a charity place usually carries a fundraising commitment sitting on top of the training. Sixteen weeks back from April puts the first week in late December.
Massive field
A massive field means a pen allocated weeks in advance, a start you queue for and a first mile run at somebody else’s pace, and on flat ground the first few miles are run at whatever pace the people around you have chosen. Over a marathon, that is a long time to be running somebody else's race.
Road
Road, which is the easy part to train for and the easy part to get wrong: the same shoes, the same socks and the same drink you intend to race in, used often enough that race morning contains no first times. The peak week puts goal-pace blocks on it, months before April.
You will be training through the northern winter
Work backwards and a sixteen-week block for an April race opens around late December, running December through to April. That is the northern winter, and it is the half of the job most plans never mention. Most of your long sessions will start or finish in the dark, in weather that makes the warm-up longer than the session. Ice takes the pace out of your hands, a chest infection goes round in week six, and the treadmill stops being a punishment and starts being a tool. And the last block lands in April, with flat ground, cool conditions and a massive field waiting at the end of it.
So the plan swaps outdoor quality for treadmill or turbo equivalents by effort rather than pace when the ground is unrunnable, and treats a week lost to illness as a rebuild rather than a hole to run through. Whatever the season takes out of two weeks, the work for a flat, fast profile, a mass field and a charity place and its fundraising is what the rebuild puts back first.
- Weeks 1-6 December-February dark, cold and interrupted, so showing up matters more than intensity
- Weeks 7-10 February-March
- Weeks 11-16 · peak and taper March-April the weather turns mid-block; the ramp holds steady anyway
Months assume London keeps its usual April slot and that you take the full 16 weeks. Adaptlete builds from the date you enter.
A real week from a London build
This is the shape of the biggest week in 16: 4-6 runs a week, 6H 43M of training, and one session that matters more than the rest. Two of them are here because of this course and not the distance: goal-pace blocks for the flat profile, and a cold-start rehearsal for conditions that are usually cool. The key session itself is written for a flat, fast profile. For an April race, week 11 lands in March. Your version is written from your hours, your history and how far out you are.
- Every session says what it is for, in plain language
- Intensity you can scan down the week without reading
- Move any session to any day without breaking the block
| Day | Intensity | Session | Distance and duration |
|---|---|---|---|
| MON | Rest | Rest | |
| TUE | Zone 4, threshold | Goal-pace blocks: 3 × 15 min at race pace | 10 mi1H15 |
| WED | Zone 2, easy | Easy run + strides | 6 mi50' |
| THU | Zone 3, steady | Strength: single-leg & eccentrics | 45' |
| FRI | Zone 1, recovery | Recovery jog | 4 mi35' |
| SAT | Zone 4, threshold | Long run: a long block at goal pace | 22 mi2H50 |
| SUN | Zone 1, recovery | Cold-start rehearsal: race effort inside the first ten minutes, from cold | 3 mi28' |
Something will go wrong.
That is the part we built for.
Nobody finishes a sixteen-week build without missing a week, and December through to April is a long time to stay lucky. The plans that fail are the ones that carry on as if nothing happened.
A work trip in week 9
Hotel treadmill, nothing else? Those days get rewritten around it.
Flu in February
The block rebuilds and ramps you back. Nothing is deleted.
A niggle at week 12
Loading comes off it, the rest of your week stays. And go see someone.
Questions people actually search
How many weeks do I need to train for London Marathon?
Sixteen weeks is the usual build for a marathon like London, at 4-6 runs a week. Counted back from an April race that opens the block around late December and runs it December through to April. Coming from a lower base, give yourself longer. With fewer weeks than that the plan compresses. It builds what it can from where you are, protects the work for a flat, fast profile, a mass field and a charity place and its fundraising first, and tells you plainly what it had to leave out.
When should I start training for London Marathon?
London is usually held in April, and the next edition an athlete could realistically build for is Spring 2027. Count back sixteen weeks from whatever date you enter and the block opens around late December, running December through to April. Adaptlete builds backwards from your date, so the whole marathon plan lines itself up the moment the date is confirmed. Entry runs on a separate clock (places here are split between a ballot and charity teams), and the training deadline is the one you control.
Is London Marathon really as fast as people say?
A flat course on road, with 50 m of climbing in it, and in April conditions are usually cool, which is good racing weather but means a cold twenty minutes standing about beforehand. So pacing discipline decides your day, and the weather is more likely to help you than to hurt you. That combination is what the sixteen weeks are built around: a flat, fast profile, a mass field and a charity place and its fundraising. The marathon on its own would give you a completely different plan.
How do I keep a London Marathon build going through the winter?
A sixteen-week block ending in April runs December through to April, which is the northern winter. Most of the long sessions start or finish in the dark, ice takes the pace out of your hands, and something goes around the office in the middle third. The plan swaps outdoor quality for treadmill or turbo work by effort rather than pace when the ground is unrunnable, and treats a week lost to illness as a rebuild instead of a hole to run through.
What if I do not get a place at London Marathon?
Most places come through a ballot or a charity team, and a charity place usually carries a fundraising commitment sitting on top of the training. The sixteen-week marathon block is written for flat road and forty thousand and up starters, whatever the paperwork says, so if the draw goes against you it moves to another April-ish target and rebuilds around the new date. Enter your date in the app once you hold a place; Spring 2027 is the edition this page is written against.
Is London Marathon a good course for a personal best?
It is a fast profile, which is why so many people target it and why so many go out too hard. The plan works backwards from your goal pace, rehearses it inside the long session, and tells you plainly if your recent sessions do not support it. Here that sits inside sixteen weeks on flat road for an April race, alongside a mass field and a charity place and its fundraising.
Is this an official London Marathon training plan?
No. Adaptlete is an independent training-plan service with no affiliation to the organizers of London Marathon, and none is implied. We name the race because the plan is built around what its course, its format and its date ask of you.