Race planning

Plan Chiang Mai Thailand by UTMB

Use the listed edition as your starting point. Each tool keeps imported race facts separate from the targets and assumptions you choose.

Edition notes: Registration is open until 10:00 AM (GMT+7) on October 31, 2026, or until races fill, with no waiting list; transfers and distance changes also close on October 31. The festival runs over two weekends: Doi Inthanon National Park (November 27–29) and Chiang Mai PAO Park (December 3–6). The event was called Doi Inthanon Thailand by UTMB in 2022–2023, and inthanon.utmb.world now redirects to chiangmai.utmb.world. UTMB’s Majors page still describes a start and finish at Doi Inthanon National Park Headquarters, which applies to the first-weekend races, not the Chiang Dao 160. UTMB Live had no 2026 page on October 20.

Listed edition

Dec 4, 2026 – Dec 6, 2026

Format

Fixed-Distance

Distance

173 km

Local start time

10:00 AM Friday at Wat Tham Chiang Dao

Duration / cutoff

48 hours (finish by 10:00 AM Sunday). Time barriers: A3 Pagia Highland Research Station (km 32.8) 7:00 PM Friday, A5 Sop Kai Village (km 51.1) 11:00 PM Friday, A7 Mae Taeng Watershed Research Station (km 71.5) 4:00 AM Saturday, A10 Mae Ka Piang Village (km 100.2) 12:30 PM Saturday, A11 Wat Pang Hai (km 110.0) 5:00 PM Saturday, A13 Maesa Elephant Camp (km 129.9) 11:59 PM Saturday and A16 Montha Than Waterfall (km 162.4) 8:00 AM Sunday.

Crew and pacers

Crews may help only at A2, A5, A7, A9, A11 and A13, one assistant per runner, and must show a Support Pass to enter the support area. Runners may not be accompanied outside the zones near aid stations.

Drop bags

Two mid-race bags: a Gold bag at A5 Sop Kai Village (km 51) and a Red bag at A11 Wat Pang Hai (km 110). Only the official bags handed out at bib collection are accepted, and poles may not go in them.

Recorded facts reviewed Oct 20, 2026. Check the organizer’s latest rules. Calendar downloads use all-day dates and do not set a starting alarm.