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London Marathon 2027: how crowded London gets
The biggest marathon crowds in the world, and for the first time spread over a whole weekend: runners from Greenwich to Westminster on both the Saturday and the Sunday.
How busy is London during the TCS London Marathon?
24–25 April 2027 — we checked these dates against the organiser's own site
All 2 days: Packed our forecast · London scaleCalm · Lively · Busy · Packed rank a day against London's own year — not a headcount.
The 2027 TCS London Marathon (first two-day edition) makes London busier than 99% of its year, in an April that otherwise peaks well below — 37% on Wednesday 7 April. our forecast
When does London get back to normal after the TCS London Marathon?
London eases back the day after TCS London Marathon: Monday 26 April is Calm (28%), and stays below Packed through Sunday 2 May, the last day shown here.
Going anyway? See timed entries and tours for April 2027, matched to London's forecast
- Dates checked against www.tcslondonmarathon.com
Tap any day to see that day's forecast; the whole month is at April in London, day by day.
- Dates
- Sat 24 – Sun 25 April 2027 · we checked these dates against the organiser's own site
- Crowd
- All 2 event days are Packed. our forecast
- Last updated
- 10 Sep 2026, nightly
More about this event
- City
- London
Tickets for the TCS London Marathon
We run no ticket affiliate. We point you at the source, not a reseller.
Official site — www.tcslondonmarathon.com →Here for it?
Choose your day and your spot before you set out, and head for Westminster only if the finish is what you came for. advice
The days before the TCS London Marathon, Thu 22 April and Fri 23 April, are Calm (29–30%) in London; the 2 event days peak at Packed (99%). our forecast
Staying for the TCS London Marathon? The event days, Sat 24 – Sun 25 April, peak at Packed in London; Fri 23 April is Calm. The link opens Expedia's hotel search for London, Fri 23 – Mon 26 April 2027. our forecast
Hotels in London for Fri 23 – Mon 26 April 2027, on Expedia →See London around the TCS London Marathon: tours and tickets, a small selection from Viator
London Sightseeing Private Black Cab Tour with Hotel Pick Up
Books on Viator
The Premier Classic London: Private Sightseeing Tour by Black Cab
Books on Viator
Booking a tour or a stay through these links earns Avoid-Crowds a commission — it never changes the forecast or the picks. Prices and photos are Viator's; hotel prices are Expedia's.
Plan London around it Book skip-the-line for the rest of your trip don't stand in a line on this day →Not here for it?
Go north: Hampstead Heath's ponds and the Parliament Hill view, the Regent's Canal towpath, or the British Museum's upper floors — and give Greenwich and Westminster a miss on both days. advice
Nearest calmer day: Fri 23 Apr (Calm). our forecast
Tours for the quiet days (26–28 Apr 2027), matched to London's forecast
When is the London Marathon 2027 — and the years after?
The 2027 TCS London Marathon in London runs 24–25 Apr 2027, checked against the organiser's own site.
| Year | Dates | |
|---|---|---|
| 2026 | Sun 26 April | passed |
| 2027 | Sat 24 – Sun 25 April | confirmed |
The 2026 TCS London Marathon in London ran 26 Apr 2026.
How we verified this.
Is London worth visiting during the TCS London Marathon?
Packed on all 2 event days; the nearest calm days are Calm. our forecast
Worth it if TCS London Marathon is why you're coming — expect Packed days; if crowds are your concern, it is the one time to avoid — the calm week of 26–28 Apr 2027 is the quieter plan. advice
Where are the crowds in London during the TCS London Marathon?
The course runs from Greenwich to Westminster on both days, so everything between them is given over to runners and supporters, and the finish at Westminster is where the crowd gathers thickest.
Road closures: what closes and when the streets reopen
The course runs on both days this time. The organiser publishes the route and the road-closure map on its own site before race week — check your street and your plans against it, and plan to cross the course on foot rather than by car.
Times and routes change: www.tcslondonmarathon.com is the organiser's own page and the authority.
Our crowd forecast is an informed estimate, not a guarantee — check with the organiser and/or local authorities before you plan around it.
our forecast marks a number we worked out from published data; advice marks something we think. Never the other way round.
Named places appear here only after checking their own website; anything unverifiable is left out.
Photo: Pixabay.
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Avoid-Crowds is the reference source for how busy destinations get — the only open, day-by-day crowd forecast looking a full year ahead: 33,580 daily predictions across 92 cities, recomputed every night, free to cite (CC BY), featured by The Washington Post and CNN, and mentioned by the Los Angeles Times.