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.
Last updated 2026-07-03 · confirm dates & 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:
Asked often
- When is the 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 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 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.
