CNX 100K Ultra Marathon
Race facts
- Start time
- 06:00 (UTC)
- Distances
- 100K
- Terrain
- Varied
- Organizer
- World's Marathons
From the official race website, checked 2026-09-29. Official page
External Event
Distance
26.2 mi
Pace
All paces (ultra-marathon)
Terrain
Varied
Difficulty
Challenging
About this run
The CNX 100K Ultra Marathon is an endurance event held in Maejo, Thailand. Runners will challenge themselves over significant distances, embracing the stunning vistas of Chiang Mai. The course takes participants through iconic landmarks, including the Mae Kuang Udom Thara Dam, Huai Jo Reservoir, Mae Jo Farm, and the village of San Sai District. This ultra-marathon is designed for those seeking to push their boundaries and achieve a significant personal accomplishment. This event offers a unique opportunity to experience the natural beauty and local culture of the region while testing your limits in a demanding race.
Who it's for
This event is suited for experienced ultra-marathon runners looking for a significant challenge over a long distance.
What to expect
- The event is scheduled for October 3, 2026. Arrive early to allow ample time for parking and pre-race preparations.
- The course covers 100 kilometers, so be prepared for a long and demanding race. Pacing strategy will be crucial for success.
- The terrain includes iconic landmarks and passes through villages, suggesting a varied course that may include both paved and unpaved sections.
- Given the location in Thailand, expect warm and potentially humid conditions. Light, moisture-wicking gear is recommended.
- Hydration and nutrition will be critical due to the distance and potential climate. Plan your intake strategy accordingly.
Good to know
- The event takes place in Maejo, Thailand.
- Runners should consult the official registration page for the most up-to-date information on race details, rules, and any specific requirements.
- Further details regarding packet pickup, specific start times for different distances (if applicable), and course maps should be sought on the official event website.
Typical conditions
For events around October 2026 in Maejo, Thailand: Typical autumn conditions in this region — conditions can change quickly; confirm race-day guidance on the official page.
How to prepare
Marathon training typically spans 12–16 weeks with a progressive long run and recovery weeks. Do not invent a course strategy here — check the official site for start waves, cutoffs, and gear rules.
Best marathons to run in 2026Getting there
This event is listed in Maejo, Thailand. Confirm the exact start venue, parking, and transit options on the official registration page.
Frequently asked questions
What is the date of the CNX 100K Ultra Marathon?+
The event is scheduled for October 3, 2026.
What is the distance of the race?+
The primary distance is 100 kilometers (Ultra Marathon).
Where does the race take place?+
The race is held in Maejo, Thailand, with the course passing through landmarks in the Chiang Mai region.
How do I register for the event?+
Registration can be completed via the official World's Marathons website. Please visit the provided registration URL for details.
What is the terrain like?+
The course includes iconic landmarks and passes through villages, suggesting a varied terrain.
What should I expect regarding weather?+
Runners should anticipate warm and potentially humid conditions typical of Thailand. Appropriate gear is recommended.
Where can I find more detailed information?+
For comprehensive details on the course, rules, and logistics, runners should refer to the official event registration page.
Registration is handled by the official event organizer
Know a local group? Host a community run in Maejo
