Races
Grand Trail des Lacs et Châteaux
Belgium, May. 165 km on 75% trail. +28,156 ft of climbing. 40 hours cutoff.
- Start1,155 ft
- High1,962 ft
- Low597 ft
- Finish1,962 ft
- Belgium at mile 0.0
- Grand Trail des Lacs et Châteaux mile 21 at mile 21, cutoff 8 hours
- Grand Trail des Lacs et Châteaux mile 41 at mile 41, cutoff 16 hours
- Grand Trail des Lacs et Châteaux mile 62 at mile 62, cutoff 24 hours
- Grand Trail des Lacs et Châteaux mile 82 at mile 82, cutoff 32 hours
- Finish Belgium at mile 103, cutoff 40 hours
Geometrycourse math
The cruxForest trails, rolling cols, and weather swings (near mile 67)
Course DNA
The Course
Grand Trail des Lacs et Châteaux runs 165 km through Belgium. Surfaces skew 75% trail / 20% dirt road / 5% paved. Forest trails, rolling cols, and weather swings. High point near 1,998 ft. Low near 581 ft. May temps run 40°F to 80°F. The course rewards patience early and punishes rushed descents after mile 51.
The Work
Train for the climbing across 165 km. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 40 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 5/10. Build a block that simulates the crux near mile 67.
Kit
May in Belgium: plan for 40°F to 80°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 40 hours pushes past dark. Poles help on sustained climbs above mile 26. Vest capacity for 2 liters minimum. Shoes matched to 75% trail: lugs for mud, rock plate if the course turns technical after mile 51.
Race Day
Hold effort through mile 26. The field often splits on the first big climb after mile 51. Forest trails, rolling cols, and weather swings near mile 67 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 34 miles of fatigue management. Finish with reserve for the last descent.
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