DateExpected
Late March 2027
Based on past editions. We'll confirm when the organiser announces.
Venue
Château de Chastellux, Chastellux-sur-Cure, France
Chastellux-sur-Cure, Yonne
Countdown
March
The middle MTB loop at Chastellux. 35 km and 900 m of climbing is a proper workout without being a full day out.
Key facts
01Riders must be older than 12
Create a free training plan for the Défi de Chastellux 35 km
7-day free trial, no card required
The course
The route
Chastellux-sur-Cure
Distance35km
Total climb900m
StartElevation
0 kmDrag map to rotate37.6 km
Weather
Late-March, Chastellux-sur-Cure
13°CTypical high
3°CTypical low
-5°CColdest in 20 years
41%Days with rain
Highs around 13°C and lows around 3°C, but it has dropped to -5°C. Rain on 41% of days. Pack for the cold end, not the average.
NASA POWER data, 2006-2025, the week either side of race day
Results
Course verified. Results not yet available.
Organiser
OrganiserEntente Cyclo Sportive Avallonnaise (ECSA / ECS Avallon)
Websiteecsavallon.fr
Running since2018
Training
Training for the Défi de Chastellux 35 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Défi de Chastellux 35 km plan targets
Typical sessions
35 km with 900 m of climbing
Endurance and fatigue resistance over the full distance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long endurance rides building toward the full distance
Threshold and sweet-spot work for sustained power
Terrain and skills practice specific to the course
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Défi de Chastellux 35 km plan.
7-day free trial, no card required.
Other races at Défi de Chastellux
More events in March in France
Black Mountain TrailExpected Early March 2027 · Saint-Amans-Soult→Black Mountain TrailExpected Early March 2027 · Saint-Amans-Soult→Ceven'TrailSat, 6 Mar 2027 · Le Vigan→L'Ultra BaumeExpected Early March 2027 · Cuges-les-Pins→La MassingienneSat, 6 Mar 2027 · Massingy→Marathon de la ToureilleSat, 6 Mar 2027 · Le Vigan→
