KhaoYai, Thailand · Saturday, December 19, 2026

Fixed Distance 100K

Khaoyai 100K Ultra Road Marathon

80 days away

100 km Distance

1,166 m Climbing

6.7 Grit · Hardcore

14.6283° N, 101.6023° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 12 m / km Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.

Time limit 18 hours 10:48 min/km average. Generous. Walkable throughout for most of the field. About average for a 100K. Measured against 214 races of the same distance. Cut-off calculator →

Field size ~789 Very large. Congested start, busy aid stations.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, December

Daytime high 27°C

Night low 16°C

Rainfall Dry — rain unlikely

Daylight 11 h 16 m of light

Regional 2001-2020 average for December — NASA POWER, grid elevation 375 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	100km	789	Ratthapon Chaivuttithorn · 07:55:34	Waerohanee Waeyusoh · 09:44:34
2024	100km	714	Decha Bootpen · 07:48:29	Waerohanee Waeyusoh · 09:23:49
2023	100km	647	Krittapas Pimukdech · 07:55:31	Nuntaporn Tengamnuay · 10:00:46
2022	100km	708	Tanat Wijitsuntorn · 07:49:25	Ninee Leknigorn · 09:58:54
2021	100km	630	Ruangyos Mahaworamakorn · 07:55:27	Jeeranat Janekatekarn · 10:13:00
2020	100km	254	Tanat Wijitsuntorn · 08:27:03	Laksuda Sajjapitak · 12:11:11

The field grew 11% between 2024 (714) and 2025 (789). 20% of the 2025 field were women.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a fast & flat course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert

👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert

🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of trail with 1,166 m of ascent.

Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
Hydration Vests Flask capacity for 100 km, without the bounce.
Headlamps A 18 h limit puts you out there after dark.
Accessories Chafe and blisters end more 100 km races than fitness does.