Thailand by UTMB is a 100km ultra marathon in Chiang Mai, Thailand. Distance: 100km. Elevation: 5,400m D+. Difficulty: challenging (Challenge Rating 57/100). DNF rate: 18%. Time limit: 28h. Surface: trail. Established 2019.
Thailand by UTMB
Chiang Mai, Chiang Mai, Thailand
"100km through the mountains of Chiang Mai. Teak forests, hill tribe villages, and tropical mountain trails."
UTMB in the tropics — 100km through the mountains of northern Thailand with jungle trails and hill tribe culture.
The Course
A demanding loop through the mountains surrounding Chiang Mai in northern Thailand. The course climbs through teak forests, visits hill tribe villages, and reaches the summit of Doi Suthep. Tropical trails with exposed ridgelines and dense jungle sections.
mountainous
loop
8
5
Runner Experience
UTMB-standard aid stations with hot food, drinks, medical support, and drop bag access at major checkpoints.
Professional UTMB-style finish with crowds, announcements, and a festival atmosphere in the finish area.
Race Day Weather
22°C
14° – 30°
60%
10%
Thai cool season — warm days, pleasantly cool nights at altitude. Dry and generally clear. Haze from agricultural burning possible.
Stats & Records
2019
500
18:00:00
Entry
THB 5,500
May
months
Lore & Trivia
Thai Mountain Trail runs through the mountains of northern Thailand — a landscape of dense jungle, temple ruins, and hill tribe villages where the Hmong, Karen, and Lahu peoples maintain traditional cultures. Thailand's trail running explosion has been driven by the country's accessible jungle terrain, warm climate, and the uniquely Thai combination of fierce competition and genuine friendliness.
- ▸ The course passes through Karen and Hmong hill tribe villages in the mountains above Chiang Mai.
- ▸ Doi Suthep temple, visible from across Chiang Mai, sits on the course route.
- ▸ Thailand by UTMB has become Southeast Asia's biggest trail running event.
- ▸ The teak forests along the course were once the heartland of Thailand's logging industry.
- ▸ Established in 2019.
Thai trail running in the northern mountains — jungle, temple ruins, hill tribe villages, and the most welcoming checkpoints in Asia.
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Frequently Asked Questions
How long is Thailand by UTMB? +
Thailand by UTMB is a 100km (100km) ultra marathon with 5,400m of elevation gain. The course is loop on trail terrain.
How hard is Thailand by UTMB? +
Thailand by UTMB is rated challenging with a Challenge Rating of 57/100 (Challenging). The DNF rate is 18%. Runners have 28 hours to finish.
How do I enter Thailand by UTMB? +
UTMB Index qualification required.. Entry costs THB 5,500. with a maximum of 700 starters.
What is the weather like at Thailand by UTMB? +
Average temperature is 22°C (range 14°C to 30°C) with 60% humidity and a 10% chance of rain. Thai cool season — warm days, pleasantly cool nights at altitude. Dry and generally clear. Haze from agricultural burning possible.
Are crew and pacers allowed at Thailand by UTMB? +
No crew access is permitted. Pacers are not allowed. Mandatory gear is required.
What is the average finish time for Thailand by UTMB? +
The average finish time is 18:00:00. About 500 runners finish each year. The DNF rate is 18%.
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