Doi Inthanon Thailand Ultra is a 100km ultra marathon in Chom Thong, Thailand. Distance: 100km. Elevation: 4,500m D+. Difficulty: challenging (Challenge Rating 53/100). DNF rate: 18%. Time limit: 24h. Surface: trail. Established 2015.
Doi Inthanon Thailand Ultra
Chom Thong, Chiang Mai, Thailand
"100km climbing Thailand's highest peak — from tropical forest through cloud forest to the 2565m summit."
A mountain ultra ascending Thailand's highest peak through multiple climate zones — from tropical lowlands to frost-covered cloud forest summit.
The Course
A mountain ultra through Doi Inthanon National Park, home to Thailand's highest peak (2565m). The course climbs from tropical lowlands through cloud forest to the summit, passing hill tribe villages, waterfalls, and ancient pagodas. A dramatic vertical journey through multiple climate zones.
mountainous
loop
8
2,565m
Runner Experience
Standard aid station support with food, drinks, and basic medical assistance at regular intervals.
Post-race gathering with awards, food, and shared stories. The ultra community spirit is strong at Doi Inthanon Thailand Ultra.
Race Day Weather
18°C
5° – 30°
65%
15%
Thai cool season. Warm at lower elevation, genuinely cold at the summit. Ideal running conditions in the lowlands.
Stats & Records
2015
250
16:00:00
8:45:22
Sanya Khanchai (2023)
11:02:33
Sunisa Sangkham (2022)
Entry
THB 3500
May
months
Lore & Trivia
The Doi Inthanon Ultra runs through the mountains of northern Thailand, summiting Doi Inthanon (2,565m) — Thailand's highest peak. The course passes through hill tribe villages, cloud forest, and rice terraces, with elephant encounters not unheard of. Thai trail running has grown explosively, and Doi Inthanon — with its combination of altitude, cultural richness, and stunning jungle terrain — is the country's signature mountain ultra.
- ▸ Doi Inthanon at 2565m is Thailand's highest peak — the summit is cold enough for frost.
- ▸ The course passes through multiple climate zones from tropical lowland to cloud forest in a single race.
- ▸ Hill tribe villages along the route showcase the Karen and Hmong cultures.
- ▸ Twin pagodas at the summit were built to honor the King and Queen of Thailand.
- ▸ Established in 2015.
Thailand's highest peak, jungle trails, and hill tribe villages — Doi Inthanon is Southeast Asian trail running at its most immersive.
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Frequently Asked Questions
How long is Doi Inthanon Thailand Ultra? +
Doi Inthanon Thailand Ultra is a 100km (100km) ultra marathon with 4,500m of elevation gain. The course is loop on trail terrain.
How hard is Doi Inthanon Thailand Ultra? +
Doi Inthanon Thailand Ultra is rated challenging with a Challenge Rating of 53/100 (Challenging). The DNF rate is 18%. Runners have 24 hours to finish.
What is the weather like at Doi Inthanon Thailand Ultra? +
Average temperature is 18°C (range 5°C to 30°C) with 65% humidity and a 15% chance of rain. Thai cool season. Warm at lower elevation, genuinely cold at the summit. Ideal running conditions in the lowlands.
Are crew and pacers allowed at Doi Inthanon Thailand Ultra? +
No crew access is permitted. Pacers are not allowed. Mandatory gear is required.
What is the course record for Doi Inthanon Thailand Ultra? +
The men's course record is 8:45:22 set by Sanya Khanchai in 2023. The women's course record is 11:02:33 set by Sunisa Sangkham in 2022.
What is the average finish time for Doi Inthanon Thailand Ultra? +
The average finish time is 16:00:00. About 250 runners finish each year. The DNF rate is 18%.
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