The 2025 edition has been announced. The event will take place on 04 Oct, 2025 (Sat). The details about this event may change. Please check the official website for possible updates.
CNX 100K Ultra Marathon
Tambon Nong Han, Thailand
04 Oct, 2025 (Sat)
Running
60 km, 100 km
About the event
Embark on an epic adventure in Chiang Mai, Thailand, where you can challenge your limits and take in stunning vistas in a 100-kilometer adrenaline-fueled odyssey. Experience the CNX 100K Ultra Marathon, exploring iconic landmarks like Mae Kuang Udom Thara Dam, Huai Jo Reservoir, Mae Jo Farm, and the quaint village of San Sai District. Push boundaries, achieve greatness, and seize the opportunity to join an unforgettable journey. Register now and be part of this incredible experience!
Races offered by this event
You have 45 weeks to prepare
60K
04 Oct, 2025 (Sat) - 03:00
Running
60 km
552 m of elevation gain
Solo
On site
Road
Rolling
Single loop
City
Scenic
100K
04 Oct, 2025 (Sat) - 03:00
Running
100 km
890 m of elevation gain
Solo
On site
Road
Rolling
Single loop
City
Scenic
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