TCS London Marathon

Why this race belongs on a competitive runner's shortlist

London is a World Marathon Major with one of the deepest fields in road running. The 2027 edition is unusual: the organizer will stage the same Greenwich-to-Westminster course on Saturday and Sunday for a total of 100,000 participants. That makes day-specific logistics as important as the familiar course plan.

Course overview

The current official route guide shows the classic start in Greenwich, the early drop toward the Thames, Tower Bridge near halfway, Docklands and Canary Wharf in the middle, and the final riverside approach to Westminster and The Mall. The 2027 organizer says both days use the same route, but final operational details are still being developed.

Miles 1 to 6

The opening routes descend from the Greenwich and Blackheath start areas before merging. That early loss of elevation encourages aggressive splits. Run by effort, stay patient while the starts combine, and avoid weaving. The goal is to reach the flatter Thames-side running with legs that have not absorbed unnecessary braking.

Miles 7 to 13

The course settles before the approach to Tower Bridge. Crowds and the landmark crossing can make halfway feel like a finish line. Keep the bridge climb controlled, take in the atmosphere without surging, and use the half split as a check on effort rather than a cue to accelerate.

Miles 14 to 20

Docklands and Canary Wharf contain more turns, underpasses, and changes in exposure than the broad flat-course label suggests. GPS can become unreliable around tall buildings. Pace from official mile markers and perceived effort, and expect short ramps to interrupt rhythm without becoming major climbs.

Miles 21 to 26.2

The late course returns west beside the Thames, passes Tower Hill and the Embankment, and turns toward Westminster and The Mall. The profile is favorable, but fatigue and repeated direction changes remain. Hold form through mile 23, then build effort toward the final landmarks if breathing and cadence are still stable.

Elevation checkpoints and how to read them

The current official guide includes a mile-marked elevation profile. The main planning points are the opening descent, the rise over Tower Bridge near halfway, short Docklands ramps, and a broadly flat final riverside run. Exact 2027 elevations should be read from the final guide rather than copied from an older route image.

Aid stations and race-day logistics

The one-off 2027 event runs on April 24 and 25. Saturday is expected to start around 9:00 with the finish closing at 17:30, while Sunday is expected to start around 9:30 and has different finish arrangements. Runners cannot swap assigned days. Verify your day, start color, transport, and cutoff in the final participant instructions.

Practical pacing plan

Keep the first downhill miles quiet, hold an even effort through Tower Bridge, and resist chasing GPS pace in Canary Wharf. The best place to make a sustained decision is after the Docklands turns, when the route points back toward the finish.

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