CORE X250 Ultra Trail - 161K

About

CORE X250 Ultra Trail - 161K is a 174 km ultra race with 9,269m elevation gain in Thailand. Terrain: mountain, forest. Near Doi Luang Chiang Dao National Park. Rated herculean difficulty. Located near Chiang Dao, Chiang Mai.

Organized byCORE THAILAND

Difficulty

Not part of any indexed race series.

Herculean267 KE

KM-Effort = distance (km) +elevation gain (m)100

Based on the ITRA standard.

Elevation Density53 m/km · Hard

Elevation Density =elevation gain (m)distance (km)

Time limit:50h

Run Conditions

MountainForest

Weather in Dec

Temperature

17 – 27°C

Warm

Humidity

Very high

Rainfall

19 mm

Dry season

Sunshine

10.6h/day

~2 rainy days expected

Registration

Website

race.action.in.th/events/COREX250UltraTrail

Deadline

Not specified

Entry fee

Early Bird – 5,400 THB(~$164)until Apr 5, 2026

Regular – 6,000 THB(~$183)

Travel & Logistics

VenueChiang Dao Scout Camp (ค่ายลูกเสือ อ.เชียงดาว)

Google MapsView on Maps

Nearest airports

CNX - Chiang Mai International Airport120 km | ~2h24 driving time

CEI - Mae Fah Luang-Chiang Rai International Airport215 km | ~4h18 driving time

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

GPS device
Map
Compass
Altimeter

Other Distances

CORE X250 Ultra Trail - 15K

16.3 km+485mDec 23

ITRA

CORE X250 Ultra Trail - 30K

34.5 km+1,846mDec 23

ITRA

CORE X250 Ultra Trail - 50K

53.4 km+2,704mDec 23

ITRA

CORE X250 Ultra Trail - 70K

70.5 km+4,112mDec 23

ITRA

CORE X250 Ultra Trail - 100K

106 km+5,905mDec 23

ITRA

CORE X250 Ultra Trail - 250K

249 km+13,665mDec 23

ITRA

Community

Reviews

No reviews yet. Be the first to share your experience!

Race data is actively being refined. If something looks off, .

Sources: website · Enriched 2026-05-29

About

Organized byCORE THAILAND

Difficulty

Not part of any indexed race series.

Herculean267 KE

KM-Effort = distance (km) +elevation gain (m)100

Based on the ITRA standard.

Elevation Density53 m/km · Hard

Elevation Density =elevation gain (m)distance (km)

Time limit:50h

Run Conditions

MountainForest

Weather in Dec

Temperature

17 – 27°C

Warm

Humidity

Very high

Rainfall

19 mm

Dry season

Sunshine

10.6h/day

~2 rainy days expected

Registration

Website

race.action.in.th/events/COREX250UltraTrail

Deadline

Not specified

Entry fee

Early Bird – 5,400 THB(~$164)until Apr 5, 2026

Regular – 6,000 THB(~$183)

Travel & Logistics

VenueChiang Dao Scout Camp (ค่ายลูกเสือ อ.เชียงดาว)

Google MapsView on Maps

Nearest airports

CNX - Chiang Mai International Airport120 km | ~2h24 driving time

CEI - Mae Fah Luang-Chiang Rai International Airport215 km | ~4h18 driving time

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

GPS device
Map
Compass
Altimeter

Other Distances

CORE X250 Ultra Trail - 15K

16.3 km+485mDec 23

ITRA

CORE X250 Ultra Trail - 30K

34.5 km+1,846mDec 23

ITRA

CORE X250 Ultra Trail - 50K

53.4 km+2,704mDec 23

ITRA

CORE X250 Ultra Trail - 70K

70.5 km+4,112mDec 23

ITRA

CORE X250 Ultra Trail - 100K

106 km+5,905mDec 23

ITRA

CORE X250 Ultra Trail - 250K

249 km+13,665mDec 23

ITRA

Community

Reviews

No reviews yet. Be the first to share your experience!

Race data is actively being refined. If something looks off, .

Sources: website · Enriched 2026-05-29