Race Categories
Event Detail
Khaoyai 100K Ultra Marathon 2026 brings Thailand's endurance-running community to Bonanza Khaoyai in Nakhon Ratchasima province on Saturday 19 December 2026. The event is listed on the International Association of Ultrarunners' 2026 calendar and offers individual 100K and 50K races. Runners should prepare for a long day around Khao Yai's rural landscape, with the 100K beginning in darkness.
Race-day programme
- 100K: announced 03:00 start; 18-hour cut-off.
- 50K: announced 03:30 start; 9-hour cut-off.
- Times are Thailand time (UTC+7). The advertised race location is Bonanza Khaoyai; the map pin follows the event's published meeting-point coordinates rather than a guessed hotel entrance.
Registration and event details
The current-edition registration service, Runlover, lists this event under active registrations. The organiser's 2026 announcement compiled by Runlah gives entry prices of THB 3,000 for 100K and THB 1,800 for 50K. Entrants should verify their chosen category remains available and check the final fee in the registration checkout. The live general-entry selector confirms registration from 10 August to 1 November 2026, checked on 31 October. An exact closing hour was not stated; availability may change.
The 2026 event is also recorded by the International Association of Ultrarunners. Its calendar classifies the race as road, while other promotional descriptions emphasise a natural setting. The precise 2026 surfaces, course markings, compulsory equipment and aid-station locations should therefore be checked against the organiser's final briefing rather than inferred from race photographs.
Official 2026 race guide: expo and bib collection are on 18 December at Bonanza Khaoyai, Pak Chong, Nakhon Ratchasima; collection hours were not stated in the guide reviewed. The guide confirms 1,166 metres of elevation gain for 100K and 646 metres for 50K, with finishes at 21:00 and 12:30 respectively. All times are local Thailand time, UTC+7. Consult the organiser for transport/parking, compulsory equipment, insurance, cancellation/postponement and qualification requirements; no previous-year arrangements are assumed.
Sources: official organiser registration, International Association of Ultrarunners 2026 calendar and 2026 organiser-announcement listing.
Current-edition organiser updates
The 2026 race entry in the International Association of Ultrarunners calendar links runners to the Khaoyai 100K organiser's Facebook page. Follow the organiser there for any confirmed route, mandatory-kit, entry-status or bib-collection updates. The current-edition race guide and any updated requirements take precedence over summaries from third-party calendars.
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