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Built on bad decisions in Boulder, CO.

Inthanon 20

Basic Listing
  1. UTMB
  2. 2026 Edition
UTMB World Series2 Stones

20km mountain loop past Ban Mae Klang Luang's terraced rice fields

Directions
Calculate UTMB Lottery Odds2 Running Stones
Register
All trail races in Thailand→
November 29, 2026
Sunday 8:00am GMT+7 start
Chiang Mai
Thailand
20.14 km
Loop Course
919 m
Elevation Gain
Historical weather
66°F / 83°FLo/Hi Temp
70°F / 89°FFeels Like
31%Cloud Cover
0% (0.08 in)Precipitation
5 mphWind Speed
77%Humidity
6:42 AMSunrise
5:46 PMSunset
Open Registration
No lottery
No Service Requirement
Does not require trail or volunteer work
No Qualifier
No qualifier race required
Beginner Friendly
Suitable for first-timers
Links
WebsiteInstagramFacebookYouTube
2020
Established

What Makes It Great

A 20-kilometer loop at Doi Inthanon National Park Headquarters highlighting the terraced rice paddies of Ban Mae Klang Luang village, set within Thailand's highest national park. A scenic introduction to high-altitude trail running with 800 meters of gain and a 7-hour cutoff.

Difficulty

Entry-Level
2/10

Suitable for first-timers

High Altitude
Steep Climbing

Inthanon 20

Chiang Mai, ThailandNovember 29, 2026

November 29, 2026
Course map for Inthanon 20
DistDistance20.14 km
GainElevation Gain919 m
LimitCutoff7 h
High AltitudeSteep Climbing

Entry Timeline

Race DayNovember 29, 2026

Lottery

This event uses open registration - no lottery entry required.

Qualifier

This event does not require a qualifier for entry.

Service Requirement

This race does not have a service requirement for entry.
20.1 km
Distance
Loop
Route
7h
Cutoff Time
1,194 m
Average Elevation
919 m
Total Ascent
918 m
Total Descent
1,457 m
High Point
994 m
Low Point
Course map
Launch Course Explorer

Aid Stations

LocationkmElevation
Doi Inthanon National Park Headquarters
Start
0.01,250 m
B1 Pha Mon Mai Village
Aid Station
9.81,194 m
B2 Mae Klang Luang Village
Aid Station
15.81,064 m
Doi Inthanon National Park Headquarters
Finish
20.11,250 m

Sign in to see cutoffs, crew access, drop bags, and services for every aid station.

No on-site camping available

Crew Access Points

Pacer Rules

No Pacers Allowed

Crew Rules

No Crew Allowed
Daylight
11h 4m
6:42 AM5:46 PM
83°F / 66°F
Feels like 89°F / 70°F
Temperature Hi/Lo
0% (0.08 in)
Precipitation
5 mph
Wind
77%
Humidity
31%
Cloud Cover
Based on historical averages for December 06

Gear Rules

Required Gear

No required gear specified

Recommended Gear

No recommended gear specified

Videos & Race Reports

No videos or race reports available for this event yet.

Reviews

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Register•November 29, 2026