Les 40 Bosses
BLOCK 2 · COURSE
40 km, 1,200 m climb
Course map, elevation profile, notable segments, aid stations and cutoffs.
BLOCK 3 · ESTIMATOR
Your real finish time
Link your data or your ITRA, we calibrate against the historical peloton.
What's your real finish time?
Link Strava, Coros, Garmin or Suunto — or use your ITRA. We compare your profile to thousands of finishers and compute your time with confidence interval.
Ballpark by profile. Compute yours in 2 min.
- ~4h46
Trained runner
Top 10 % of finishers
- ~6h04
Regular runner
Around the median
- ~7h48
Conservative pace
Comfortable margin
BLOCK 5 · LOGISTICS
Pre-race essentials
How to get there (train, carpool), bib pickup, mandatory gear, and everything you need to know on-site.
How to get there
Pick your way in
Come by train
Get to the race by train
Type your nearest station — we'll send you to SNCF Connect.
Dates on SNCF Connect must be re-selected on the next page (their URL doesn't yet carry them).
Carpool
Share the ride with other runners
Soon: a per-race carpool thread with direct runner-to-runner listings. In the meantime, check BlaBlaCar or local Facebook groups.
Weather & conditions
Plan for what's coming up there.
Live forecast
Available starting J-14 — 164 days to go.
BLOCK 8 · COMMUNITY
From finishers, for finishers
Ratings, race reports, photos, Q&A. What you won't read on the official site.
Do you organize this race?
6 December 2026
J-178