Best Full Marathons in Thailand
Last updated July 31, 2026
Thailand's full marathons run from big-city road races in Bangkok and Chiang Mai out to provincial events in Nakhon Ratchasima, Khon Kaen and Songkhla that most visitors never hear about. The calendar leans heavily on the November-to-February window, when the northeast monsoon has passed and mornings are genuinely cool by regional standards. Fields vary enormously in size, and several of these are AIMS-certified courses, which matters if you're chasing a qualifying time rather than a weekend away.
- 1AUG
- 23AUGThe 27th Songkhla Marathon 2026
Songkhla, Thailand
Full Marathon (42.2km) Half Marathon (21.1km)Closed Details → - 27SEPAmazing Thailand Pattaya Marathon (33rd ed.)
Pattaya, Chonburi, Thailand
Full Marathon (42.2km) Half Marathon (21.1km) 10K 5K (4.5km)Open Details → - 8NOVKorat Marathon
Nakhon Ratchasima, Thailand
Full Marathon (42.2km) Half Marathon (21.1km) 10K 5KOpen Details → - 15NOVBangsaen42 (Bangsaen Marathon)
Bang Saen, Chonburi, Thailand
Full Marathon (42.2km) Half Marathon (21.1km) 10K - 28NOVAmazing Thailand Marathon Bangkok (ATMB)
Bangkok, Thailand
Full Marathon (42.2km) Half Marathon (21.1km) 10K 5K (4.5km)Open Details → - 13DECPhotak Marathon (6th ed.)
Nong Khai, Thailand
Full Marathon (42.2km) Half Marathon (21.1km) 10K 5KOpen Details → - 13DEC
- 20DECMuang Thai Chiang Mai Marathon
Chiang Mai, Thailand
Full Marathon (42.2km) Half Marathon (21.1km) 10KOpen Details → - 10JAN
Frequently asked questions
When is marathon season in Thailand?
The bulk of Thai marathons fall between November and February. That window sits after the rainy season and delivers the coolest mornings of the year, particularly in the north and northeast. Races outside it are far fewer and typically start earlier in the morning to compensate for heat.
Are Thai marathons suitable for a first-time marathoner?
Many are, though heat is the deciding factor rather than terrain. Northern and northeastern courses in the cool season are the most forgiving. Check the flag-off time: a 4am start is common and changes how you would plan sleep, travel and the night before entirely.