LOPBURI21 Sunflower Half Marathon Lop Buri 2026 - Thailand

LOPBURI21 Sunflower Half Marathon 2026 takes place on Saturday 5 December 2026 in Lop Buri, Thailand, combining a half marathon and mini marathon with a shorter evening run. The main road races assemble at the Special Warfare School, Special Warfare Centre, Erawan Camp (โรงเรียนสงครามพิเศษ). The 4 km fun run uses a different starting area beside Huai Krathaek Reservoir, so participants should not assume that every event starts from the school grounds.

Officially advertised race programme (Thailand time)

• 21.1 km half marathon: starts 05:30, with an advertised 4-hour time limit. Listed entry fee THB 950.
• 10 km mini marathon: starts 06:00, according to the organiser’s own current-edition announcement. Listed entry fee THB 800.
• 4 km fun run: starts 17:30 beside Huai Krathaek Reservoir. Listed entry fee THB 650. The organiser describes this as 4 km, not 4.2 km or 5 km, and ARC does not provide an exact 4K filter, so this legitimate race is documented here without mislabelling its structured distance.

The Lopburi21 organiser announcement describes the race distances as certified by the Athletics Association of Thailand. Participants should consult the final organiser maps and instructions for the exact course, road access and water stations. The routes and reporting times for the morning and evening activities differ; allow adequate travel and collection time.

Registration and identity requirements

Registration checked 3 November 2026: the organiser’s official fee announcement advertises general entry from 18 September to 1 November 2026, following its 9–17 September promotion. That advertised window has ended; no extension, reopening or remaining capacity is assumed. The listed standard fees include the event shirt: 21.1km THB950,10kmTHB800,4kmTHB650; no-shirt21.1kmTHB800 and10kmTHB650, charity21.1/10kmTHB2000. Payment charges are3%PromptPay or5%creditcard. Follow the organiser's official Lopburi21 Facebook page for the live booking method and remaining spaces rather than relying on an assumed deadline.

The organiser requires in-person collection of race bibs and says runners must wear an event identity wristband throughout the race. Checks are described at the starting block and again when runners collect medals, refreshments and prizes; failing to wear the wristband can mean losing eligibility for those benefits. Registrations cannot be renamed, switched to another distance, refunded or transferred under the organiser’s announced conditions. The competitive21.1km/10km awards require age16orover; younger participants may run without award eligibility.

Race-pack collection

• Friday 4 December, 11:00–20:00: Robinson Department Store, Lop Buri.
• Saturday 5 December, 04:00–05:00: Special Warfare School, the main morning race venue.

The organiser directs entrants to its Facebook page for updates and practical instructions. The 4 km evening run is scheduled well after the morning events, so confirm its separate course entry point and bib instructions. Volunteers and marshals may adjust access restrictions to suit military-site security and local traffic needs.

Planning your run

Lop Buri can be warm by midday even during Thailand's relatively cool December season. For the early half marathon, allow time for transport to Erawan Camp, security screening, toilets, warm-up and getting into the correct start corral. The 4 km runners should independently confirm the Huai Krathaek Reservoir meeting area before travelling.

Verification sources: Lopburi21 organiser's official Facebook page, the 2026 race-calendar category and price listing, and the organiser’s own race and collection announcement. Organiser updates supersede third-party calendars.