KhaoYai, Thailand · Saturday, December 19, 2026

Fixed Distance 50K

Khaoyai 50K Ultra Road Marathon

80 days away

50 km Distance

not publishedn/a Climbing

2.5 est Grit · Entry level

Calculated from 50 km alone — the organiser has not published an elevation profile. Read 2.5 as a floor, not a verdict.

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

What the course asks

Time limit 10 hours 12:00 min/km average. Generous. Walkable throughout for most of the field. Climbing is unpublished, so this pace is a ceiling on the effort, not a measure of it. About average for a 50K. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~255 Large. Rarely out of sight of another runner.

DUV results for the 2025 edition (50km) — 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	50km	255	Anuchit Bunyakit · 03:24:18	Lawun Sukpoowong · 04:25:32
2024	60km	230	Anuchit Bunyakit · 04:21:31	Lawun Sukpoowong · 05:21:31
2023	60km	181	Kazuma Tanaka · 04:46:54	Nattanat Kuhatanasathien · 05:23:54
2022	60km	248	Kazuma Tanaka · 04:46:54	Nattanat Kuhatanasathien · 05:23:54
2021	60km	182	Narin Keawsompak · 04:51:26	Netchanok Thongkamchum · 06:27:13

The field grew 11% between 2024 (230) and 2025 (255). 34% of the 2025 field were women.

DUV results for the 2025 edition (50km) — 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

👟 gear

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

By UltraHub Expert

Gear for this race

Chosen for 50 km of trail.

Trail Running Shoes 50 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 50 km, without the bounce.
GPS Watches Battery life first — a 50 km day outlasts most full-GPS modes.

Salomon

Sense Ride 5

RunRepeat found the Salomon Sense Ride 5 to have immaculate lockdown and a smooth and stable ride, making it confident on moderate trails and steep downhills. I…

★★★★★ 4.5

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Spring Energy

Awesome Sauce

Real food gel with 180 calories. Rice-based with natural flavors.

$4 ★★★★★ 4.6

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Suunto

Vertical

Titanium GPS watch with solar charging, offline maps, and 140-hour GPS battery.

$630 ★★★★★ 4.5

All gear guides →

Overview

The Khaoyai 50K Ultra Road Marathon is a 50-kilometer road race held in KhaoYai, Thailand, on December 19, 2026. With 255 finishers in its 2025 edition, this race attracts a larger field than 94% of 50k races, placing it among the biggest fields in its category of 2660 peer events.

A 10-hour time limit means runners must maintain a pace faster than 12 minutes per kilometer. This cutoff is tighter than 42% of 1019 comparable 50k races, allowing less margin than many similar events. The race has been held 5 times, starting in 2021.

Similar races

Other 50K trail ultras, closest in distance first.