Semi-Marathon de Boulogne-Billancourt 2026: follow and cheer

The Semi-Marathon de Boulogne-Billancourt starts on Sunday 15 November 2026 at 10:00, just west of Paris: a sold-out half marathon for 13,000 runners, along the Seine and through the Bois de Boulogne. The 2026 roadbook isn't out yet, so the course details here come from the organiser's 2025 roadbook (PDF). Check again in race week.

The race at a glance

Follow live

The race's own timing. Each bib carries a chip that times the runner from the start line to the finish, and results go up on the race website on Sunday. The 2025 roadbook also said runners could give family and friends access to a live follow ("suivi en direct"), so ask your runner whether they've set that up.

GPS from their phone. If your runner carries their phone, Cheerlify shows them as a dot on the course map, with their pace and an estimate of when they'll reach the next kilometre and the finish. You open a link and a code in any browser, with no app or account, and you can record a voice or video cheer that plays in their earbuds at a kilometre you choose. Why the two complement each other: chip timing vs GPS.

The course

In 2025 the course ran along the Seine on the Quai Georges Gorse, beside the Parc de Billancourt, around km 3. The middle of the race is in the Bois de Boulogne, with the Allée de la Reine Marguerite around km 11, just before the small climbs. After the Bois, runners come home along the quais from about km 15 to 18, and there's a cheering zone with a DJ on the rue de Sèvres at km 20.

Where to cheer, and when to send a cheer

The 2025 roadbook suggested the corner of Rue du Dôme and Boulevard de la République for the start, the Quai Georges Gorse at km 3, the Allée de la Reine Marguerite around km 11, the quais by the ACBB Rugby ground on the way back, and the rue de Sèvres at km 20. For a cheer in their earbuds:

• Around km 13, deep in the Bois, where few supporters get to and the legs start to complain.
• Around km 19, on the quais, with two kilometres to go.

Checklist

1. Their bib number saved on your phone.
2. Asked whether they've given you access to the race's live follow.
3. Their Cheerlify link opened and tested the evening before, and their phone fully charged.
4. Cheers recorded for km 13 and km 19.
5. Going in person: the 2026 roadbook checked for road closures and transport.

FAQ

How do I follow a runner in the Semi-Marathon de Boulogne-Billancourt? The chip times every runner, and results are on the race website on Sunday. For a continuous dot on the map with an arrival estimate, add GPS tracking from their phone with Cheerlify.

What time does it start, and is there a time limit? 10:00 on Sunday 15 November 2026. In 2025 the time limit was 3 hours.

More races on these weekends: Europe's race weekends in November 2026.

Details checked on the organiser's site and 2025 roadbook on 8 November 2026. Race names belong to their organisers. Cheerlify is not affiliated with the Semi-Marathon de Boulogne-Billancourt or its organiser.