Grindstone 50K is a 52.0 km trail race of Grindstone Trail Running Festival by UTMB 2025 in Swoope, United States. The race starts on September 18, 2025. The course climbs 1421 m+ and descends 1418 m−, between a low point of 405 m and a high point of 1146 m. By gradient, 32% of the distance is uphill, 30% downhill and 38% flat. The longest climb runs 3.4 km at an average 5.8% grade (200 m of vertical). The longest descent runs 5.0 km at 11.0% (550 m of vertical). Surface: 60% trail, 15% road, 11% smooth, and 10% extreme. Flat-equivalent effort: 62.2 FlatKM.
240 finishers completed the 2025 edition. Men's winner: Ben Robinson (United States) in 4:19:37. Women's winner: Sarah Bergeron Larouche (Canada) in 4:25:36.
This page has the full results and splits, interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for Grindstone 50K.
Other distances of Grindstone Trail Running Festival by UTMB 2025Grindstone 100M (169 km)·Grindstone 100K (105 km)·Grindstone 21K (21.0 km)
Other editions of Grindstone 50K2026
Official websitegrindstone.utmb.world
