Inthanon 50 is a 39.0 km trail race of HOKA Chiang Mai Thailand by UTMB 2025 in Chiang Mai, Thailand. The race starts on November 29, 2025.
By gradient, 38% of the distance is uphill, 46% downhill and 16% flat. The longest climb runs 5.4 km at an average 12.8% grade (694 m of vertical). The longest descent runs 2.7 km at 6.6% (180 m of vertical). The steepest climb averages 31.8% over 0.3 km. The steepest descent drops at 33.7% over 0.3 km. Surface: 56% trail, 30% road, and 13% smooth. Flat-equivalent effort: 58.1 FlatKM.
Poles bring little benefit here — only about 6.6 km of pole-friendly terrain.
Quad damage risk is moderate (index 28 of 100), with 38% of the load in the first half: 0 descents deserve a plan and a couple of downhill sessions before race day.
Historically on race day, start temperatures range from 14°C to 20°C, around 17°C at the highest point; the chance of precipitation is about 12%.
832 finishers completed the 2025 edition. Men's winner: Miguel Arsenio (Portugal) in 3:27:59. Women's winner: Maude Mathys (Switzerland) in 3:54:26.
This page has the full results and splits, interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for Inthanon 50.
Other distances of HOKA Chiang Mai Thailand by UTMB 2025Chiang Dao 160 (168 km)·Elephant 100 (96.0 km)·Hmong 50 (56.0 km)·Hmong 50 Night (56.0 km)·Suthep 20 Night (21.0 km)·Suthep 20 Day (21.0 km)·Inthanon 20 (20.0 km)·Chedi 20 (17.0 km)
Official websitechiangmai.utmb.world
