Thailand’s endurance running calendar continues to expand, with multiple long-distance events scheduled throughout 2026. For runners based in Phuket, as well as visitors planning travel around races, the Thailand Ultra Master Series provides several options across different regions of the country.
Below is an overview of five confirmed events, including dates, locations, and race formats.
1. Phuket 100K Ultra Marathon 2026
Race Day: 6 June 2026
Location: Splash Beach Resort, Mai Khao, Phuket
Distances: 100KM | 50KM | 60KM (Trio format)
This event is scheduled to take place in northern Phuket at Mai Khao. It is the only race in the series hosted on the island, making it the most directly accessible option for runners living in or visiting Phuket. https://www.facebook.com/phuket100K
2. Thailand 100K Ultra Marathon 2026
Race Day: 2 August 2026
Location: Kasetsart University Kamphaeng Saen Campus, Nakhon Pathom
Distances: 100KM | 50KM
Held west of Bangkok, this event takes place on a university campus. Its central location makes it reachable from multiple parts of the country, including Phuket via domestic travel.
More information
3. CNX 100K Ultra Marathon 2026
Race Day: 3 October 2026
Location: Maejo Golf Resort & Spa, Chiang Mai
Distances: 100KM | 50KM
This race is scheduled in northern Thailand. Chiang Mai is a major regional hub with regular flight connections from Phuket and Bangkok.
More information here: https://www.facebook.com/CNX100K/
4. Khao Yai 100K Ultra Marathon 2026
Race Day: 19 December 2026
Location: Bonanza Khao Yai, Pak Chong, Nakhon Ratchasima
Distances: 100KM | 50KM
This event takes place in the Khao Yai area, northeast of Bangkok. It is the final 100K race in the series for the 2026 calendar year.
5. Thailand 24H 2027
Race Day: 9–10 January 2027
Distances: 24H | 12H | 6H
Scheduled shortly after the end of 2026, this time-based endurance event offers multiple formats based on duration rather than distance. It is part of the same broader race series.
Planning Around Races in Thailand
For runners based in Phuket, the June event provides a local option, while the remaining races require domestic travel. All listed locations are accessible by air or road from major Thai cities.
When planning participation, it’s advisable to confirm:
- Registration details and deadlines
- Course formats and rules
- Accommodation near race venues
About This Guide
This article is part of the Phuket Momentum Fitness Directory’s effort to document fitness events in Phuket and across Thailand.
