Watlaharnrai Half Marathon 2027

The Watlaharnrai Half Marathon returns to Rayong on Sunday 5 September 2027, over 21.4 km, 10 km and 5 km.

Facts last checked September 28, 2026

The Watlaharnrai Half Marathon is scheduled for Sunday 5 September 2027 in Rayong, on Thailand's eastern gulf coast. It is an AIMS-sanctioned road race run from Wat La Harn Rai in Ban Khai, and its headline distance is slightly over the standard half marathon at 21.4 km. Distances shown are those of the most recent edition; the 2027 line-up has not been published yet.

Key facts
Date	2027-09-05
Distance Km	21.4, 10, 5
Primary Distance Km	21.4
City	Ban Khai, Rayong
Country	Thailand

half-marathon thailand

Frequently asked questions

When is the Watlaharnrai Half Marathon 2027?

Sunday 5 September 2027, in Ban Khai, Rayong. The race is run from Wat La Harn Rai, a temple in the Ban Khai district, roughly two hours south-east of Bangkok on Thailand's eastern gulf coast.

How long is the Watlaharnrai half marathon course?

21.4 km, slightly longer than the standard 21.0975 km half marathon distance, with 10 km and 5 km races alongside it. Times set here are therefore not directly comparable to a certified half marathon personal best.