Races Half marathon · London, UK
The Big Half
The Big Half is a flat half marathon in London, UK, held each September. Tower Bridge, Canary Wharf and a Cutty Sark finish — flat and quick through east London. Early September in London is mild, 12-18C. On a course as flat as The Big Half, even splits are everything; the classic mistake is banking time in the first third.
Page rebuilt 2026-10-01 · race facts not independently verified — confirm dates and entries on the official race site
When
September
every year
Course
flat
Half marathon
Conditions
Early September in London is mild, 12-18C.
Racing this course well
Tower Bridge, Canary Wharf and a Cutty Sark finish — flat and quick through east London.
On a course as flat as The Big Half, even splits are everything; the classic mistake is banking time in the first third.
Pick your goal for London
Pace charts, weekly structure and timelines for the most common half marathon goals:
We don’t hold a confirmed date for this edition, so any countdown comes from the date you enter here.
Build your training around The Big Half.
RunV works backwards from race day to today and rearranges the weeks when life interrupts. It does not adapt to this specific course — the pacing guidance above is where the course knowledge is.
Everything above stays free and complete — this is an optional next step, not a paywall.
Asked often
- When is The Big Half?
- It is held each September in London, UK. Check the official The Big Half site for the exact date and entry windows.
- Is The Big Half course flat?
- Tower Bridge, Canary Wharf and a Cutty Sark finish — flat and quick through east London.
- How should I train for The Big Half?
- Train specifically for London — terrain, conditions, goal pace — and let the plan flex around real life. That's exactly what RunV's engine does after every run you log.
Not sure what to target? Predict your half marathon time from a recent race →
More half marathon races
Build for London — around your actual life
RunV engineers your block backwards from race day in September — and rebuilds it every time training doesn't go to script.
