Boulogne-Billancourt Half Marathon 2026: every workout on your Garmin until November 15

A fast course between the Seine and the Bois de Boulogne

The start is at 10 a.m. at 117 avenue Victor-Hugo, for every start pen. The course takes in the Seine quays and the Bois de Boulogne, with 124 m (407 ft) of climbing according to the organizer, who bills it as the fastest course in France. The race holds a gold label from the French Athletics Federation and brings together 13,000 runners for its 29th edition.

Mid-November mornings are often cool: do at least one long run in the kit you plan to race in, so nothing surprises you on the start line. Mind the bib pickup too: it takes place on Friday and Saturday at the Gymnase de la Biodiversité, and no bibs are handed out on November 15.

Ten weeks from early September

For November 15, 2026, the 10-week half marathon plan started on Monday, September 7: three base weeks, three development weeks, three weeks of specific work at half marathon pace, then one taper week.

The AI coach first checks your VMA read on Garmin: it sets every pace in the plan. Without a reliable VMA, it starts with a 6-minute test rather than inventing a value.

Race-day pacing strategy

The instruction: first 1.2 miles at target pace plus about 8 seconds per mile, target pace afterwards, and let go over the last 3 miles. A simple check: at halfway you should be on your target split, not ahead of it. The organizer provides two pacers per start pen from 1:30 to 2:05, plus pacers from 1:06 to 1:18 for the fastest runners.

• — Weeks 1 to 3: base, long run of 60 to 65 minutes.
• — Weeks 4 to 9: development, then specific work at half marathon pace, long run up to 1:48.
• — Week 10: taper, fresh legs for November 15.

Schedule the plan's "Race" session on the watch: it carries the pace range and alerts you at the first too-fast kilometre.

Frequently asked questions