About
CORE X250 Ultra Trail - 15K is a 16.3 km trail race with 485m elevation gain in Thailand. Terrain: mountain, forest. Near Doi Luang Chiang Dao National Park. Rated easy / beginner friendly difficulty. Located near Chiang Dao, Chiang Mai.
Difficulty

Based on the ITRA standard.
Run Conditions
Temperature
17 – 27°C
Warm
Humidity
Very high
Rainfall
19 mm
Dry season
Sunshine
10.6h/day
~2 rainy days expected
Registration
Travel & Logistics
Race Day Info
GPX File
Not yet released, check again closer to race date
BiB Collection
Not available yet, check again closer to race date
Mandatory Gear
Not available — check the website for more details
Other Distances
CORE X250 Ultra Trail - 30K
CORE X250 Ultra Trail - 50K
CORE X250 Ultra Trail - 70K
CORE X250 Ultra Trail - 100K
CORE X250 Ultra Trail - 161K
CORE X250 Ultra Trail - 250K
Community
Reviews
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Sources: website · Enriched 2026-05-29