Races Half marathon · Brussels, Belgium
20 km of Brussels
20 km of Brussels is a rolling half marathon in Brussels, Belgium, held each May. A loop from the Cinquantenaire through the city centre, down Avenue Louise and its tunnels, then through the Bois de la Cambre. The climb back up Avenue de Tervueren comes late, on tired legs. Late May in Brussels is usually mild, with typical race-day temperatures of 10 to 20°C and a chance of showers. The rises around Brussels are small but relentless — train on similar terrain and race by effort, not pace.
Page rebuilt 2026-11-14 · race facts not independently verified — confirm dates and entries on the official race site
When
May
next: Sunday 30 May 2027
Course
rolling
Half marathon
Conditions
Late May in Brussels is usually mild, with typical race-day temperatures of 10 to 20°C and a chance of showers.
Racing this course well
A loop from the Cinquantenaire through the city centre, down Avenue Louise and its tunnels, then through the Bois de la Cambre. The climb back up Avenue de Tervueren comes late, on tired legs.
The rises around Brussels are small but relentless — train on similar terrain and race by effort, not pace.
Getting a place
- How you get in
- Open entry: first come, first served
- Price
- €40 (2027 race)
Official 20 km of Brussels site →Checked November 2026
Race day
- Next race
- Sunday 30 May 2027
- Start time
- 10:00
- Field size
- 48,928 finishers in 2025
- Time limit
- 5 hours
- Exact distance
- 20 km
The course in numbers
Avenue Louise has several tunnels, and the climb up Avenue de Tervueren comes near the end.
- Layout
- Loop
Worth knowing
- First run in 1980.
- The first edition ran on 8 June 1980 and finished at the foot of the Atomium.
- Runners start in six waves about 15 minutes apart.
- The 2020 edition was cancelled, and the 2021 race was held in September.
Pick your goal for Brussels
Pace charts, weekly structure and timelines for the most common half marathon goals:
The date shown is the one the organiser has announced. Change it if yours differs.
Build your training around 20 km of Brussels.
RunV works backwards from race day to today. Your plan adapts when life interrupts, and you approve every change. 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 20 km of Brussels?
- The next 20 km of Brussels is on Sunday 30 May 2027 in Brussels, Belgium. It is held each May.
- Is the 20 km of Brussels course flat?
- A loop from the Cinquantenaire through the city centre, down Avenue Louise and its tunnels, then through the Bois de la Cambre. The climb back up Avenue de Tervueren comes late, on tired legs.
- How do I enter the 20 km of Brussels?
- Open entry: first come, first served. Price: €40 (2027 race).
- How should I train for the 20 km of Brussels?
- Build for the course you'll actually race at the 20 km of Brussels: rolling terrain, May conditions. RunV Premium builds a training plan around your goal time and race date, and lets you adapt it when life interrupts the Brussels build.
Not sure what to target? Predict your half marathon time from a recent race →
More half marathon races
Supplements research for this distance
Build for Brussels — around your actual life
RunV engineers your block backwards from race day in May — and adapts it when training doesn't go to script. You approve every change.
