Ultramarathons in Thailand

28 races tracked — the season peaks in December (5 races), with January close behind (4).

By distance 22 50K · 4 100K · 1 Marathon · 1 50 mi
Biggest field Khaoyai 100K Ultra Road Marathon — 789 finishers in 2025
Steepest course AKHA Trail — 85.5 m/km
Deepest results history CM6 Run - CM5 100 Km — 8 recorded editions

Next starts in Thailand

All 21 upcoming →
Fixed Distance50K
GRIT 2.5

Phuket Trail 50

Phuket, THA

50 km Sep 12
Fixed Distance50K
GRIT 2.8

Koh Chang Trail

Koh Chang, THA

55 km Sep 27
Fixed Distance100KFast & Flat
GRIT 6.3

CNX 100K Ultra Marathon

Chiang Mai, THA

100 km 872 m D+ Oct 3
Fixed Distance50K
GRIT 2.5

CNX 50K Ultra Marathon

Chiang Mai, THA

50 km Oct 3
Fixed Distance50KMountain
GRIT 8.1

Thep Sadet Trail 50km

Doi Saket, Chiang Mai, THA

56 km 3,500 m D+ Oct 31
Fixed Distance50KRolling
GRIT 4.8

Ultra Nakee Naka Trail

Ban Phaeng, THA

50 km 1,503 m D+ Nov 1
Fixed Distance50K
GRIT 2.5

Cuesta X Trail - CXT-50

Nakorn Ratchasima, THA

50 km Nov 8
Fixed Distance50KMountain
GRIT 6.1

AIA One Billion Trail

Chiang Mai City, THA

50 km 2,406 m D+ Nov 21
Fixed Distance50K
GRIT 2.5

Phutajor Trail

Kapong, THA

50 km Nov 29
Fixed DistanceMarathon
GRIT 2.3

Soi Malai Trail Winter 45 km

Doi Soi Malai, THA

45 km Dec 12
Fixed Distance100KFast & Flat
GRIT 6.7

Khaoyai 100K Ultra Road Marathon

KhaoYai, THA

100 km 1,166 m D+ Dec 19
Fixed Distance50K
GRIT 2.5

Khaoyai 50K Ultra Road Marathon

KhaoYai, THA

50 km Dec 19