Lace up for these marathons around Thailand in Q4 2026
Overview of some the remaining races that are runnning from October to December of this year
The Thaiger key takeaways
- Thailand’s Q4 marathon season is filled with events from October to December, including full marathons, half-marathons, trail races, and urban runs across the country.
- Many races pass through scenic and cultural routes, allowing runners to enjoy iconic landmarks, riversides, historic sites, and lush landscapes while staying active.
- Early registration and proper bib collection are essential to avoid disqualification and to ensure participants can fully enjoy each event.
The cool season is the runner’s season in Thailand, and the final quarter of 2026 is stacked with reasons to pin on a bib. From October through December, the weather softens, the humidity eases, and the country’s race calendar hits full stride, with flat city marathons under the stars, coastal courses built for personal bests, ancient-ruin loops and lung-busting mountain trails on Thailand’s highest peak.
Whether you are chasing a Boston qualifier, tackling your first 10km or just want a scenic excuse to travel, here are the marathons and running events worth lacing up for around Thailand in Q4 2026. As always with annual races, dates and registration can shift, so confirm the details on each event’s official page before you book flights.
Something to keep in mind: a full marathon officially consists of 42.195 kilometres, and a half-marathon officially consists of 21.098 kilometres. This is the standard, but different events might have different proprietary distances as well. Most Thai events also offer a 10km, a 5km and a family-friendly fun run, so there is a start line for every level of fitness.
On this page:
| Month | Featured races | Short summary |
|---|---|---|
| October 2026 | Sukhothai Marathon | Kick off Thailand’s cool-season running calendar with a scenic marathon through the UNESCO-listed ruins of Sukhothai Historical Park on a fast, beginner-friendly course. |
| November 2026 | Bangsaen42, Bangkok Marathon, HOKA Chiang Mai by UTMB, Amazing Thailand Marathon Bangkok | November delivers Thailand’s busiest marathon month, featuring world-class road races, iconic city marathons and internationally recognised trail-running events. |
| December 2026 | Garmin Run Thailand Half Marathon, Photak Marathon, Scenic Half Marathon, Bangsaen21, Chiang Mai Marathon | Round off the year with fast half marathons, scenic Mekong riverside races and one of Thailand’s most popular full marathons in cool December conditions. |
October 2026
Sukhothai Marathon — Sukhothai, 11 October
The Q4 season opens in the cradle of the old kingdom. Staged in and around Sukhothai Historical Park, this race sends runners past 13th-century temples, Buddha images and lotus-filled ponds while the morning mist is still hanging over the ruins. The terrain is flat and forgiving, which makes it a favourite for first-timers and PB-hunters alike.
- Date: Sunday 11 October 2026
- Distances: Full marathon, half marathon, 10km and 5km
- Why run it: Few races let you clock kilometres through a UNESCO World Heritage site with history and a flat course in one.
Details and entry via the Sukhothai Marathon listing.
November 2026
Bangsaen42 Chonburi Marathon — Bang Saen, Chonburi, 15 November
One of Thailand’s most respected road marathons, Bangsaen42 is a World Athletics-labelled event known for its slick organisation, roaring local support and a fast, largely flat coastal course beside the Gulf of Thailand. It is a genuine Boston Marathon qualifier, so expect a serious field of pace-chasers alongside the weekend warriors.
- Date: Sunday 15 November 2026
- Distance: Full marathon (42.195km)
- Why run it: Sea breezes, big crowds and a course designed for a fast time just 90 minutes from Bangkok.
Register through the official Bangsaen42 site.
Bangkok Marathon — Bangkok, 15 November
The capital’s classic road marathon rolls out from near the Grand Palace in the small hours, letting runners take on the city’s landmarks while the traffic sleeps. Starting around midnight, it is an atmospheric, floodlit tour of Rattanakosin Island and the riverside before the heat of the day arrives.
- Date: Sunday 15 November 2026 (midnight start)
- Distances: Full marathon, half marathon, 10km and shorter fun-run options
- Why run it: Bangkok’s icons, empty roads and a cooler night-time start. A bucket-list city marathon.
See dates and entry on the Bangkok Marathon event page.
HOKA Chiang Mai Thailand by UTMB — Doi Inthanon & Chiang Mai, 27–29 November
Thailand’s marquee trail event and a stop on the global UTMB World Series, this one is for the mountain crowd. Routes climb the flanks of Doi Inthanon, the country’s highest peak, threading from humid lowland forest up to montane ridgelines past Hmong and Karen villages, terraced rice paddies and cloud-wrapped viewpoints. It draws elite ultra runners from around the world.
- Dates: 27–29 November 2026 at Doi Inthanon, with further categories reported for 3–6 December in Chiang Mai (confirm your distance’s date)
- Distances: Trail categories from roughly 20km up to 100 miles
- Why run it: Serious elevation, world-class organisation and some of the most beautiful high country in Southeast Asia.
Entry and running stones via the official UTMB Chiang Mai site.
Amazing Thailand Marathon Bangkok — Bangkok, 28–29 November
Presented by Toyota and staged around Sanam Luang and the MBK area, this is the flagship city-marathon festival built to showcase Bangkok to visiting runners. The half marathon goes off on the Saturday, with the full marathon, 10km and family run following on the Sunday in the cool pre-dawn hours.
- Dates: Saturday 28 – Sunday 29 November 2026
- Distances: Full marathon, half marathon, 10km and a 4.5km family run
- Why run it: A polished, tourism-focused event with landmark backdrops, though be warned, it sells out fast, so check availability before planning your trip.
Details on the Amazing Thailand Marathon site.
December 2026
Garmin Run – Thailand Half Marathon — Ayutthaya, 6 December
The Garmin series lands in the old capital of Ayutthaya for a fast, flat half marathon among the temple ruins. Slickly run and gadget-friendly, it is a great target race for anyone building towards a longer distance later in the season.
- Date: Sunday 6 December 2026
- Distances: Half marathon and 10km
- Why run it: A quick course through World Heritage surroundings, with the polish you would expect from a brand-backed event.
Sign up via the Runlah page.
Photak Marathon — Pho Tak, Nong Khai, 6/13 December
A homegrown Isaan favourite, the Photak Marathon hugs the mighty Mekong in the northeastern border province of Nong Khai. Expect cool riverside air, warm local hospitality and a genuine community atmosphere far from the big-city start lines — plus a course well regarded by qualifiers.
- Date: Early December 2026 (sources list 6 or 13 December — confirm before booking)
- Distances: Half marathon and 10km
- Why run it: Mekong scenery and small-town Isaan charm make this one of the region’s most authentic races.
Watch for updates on the Photak Marathon event page.
Scenic Half Marathon Nakhon Phanom — Nakhon Phanom, 12–13 December
Billed as the “Slow Life by the Mekong” run, this half marathon follows the celebrated Naga Way along the riverfront in Nakhon Phanom, with the mountains of Laos rising across the water. It is as much about the views and the laid-back vibe as the finishing time.
- Dates: 12–13 December 2026
- Distances: Half marathon plus shorter supporting races
- Why run it: Arguably the most photogenic riverside course in the country, and a reason to explore the quiet upper Isaan.
Details on the Scenic Marathon site.
Bangsaen21 Half Marathon — Bang Saen, Chonburi, 20 December
Thailand’s flagship half marathon and the country’s first World Athletics Platinum Label road race, Bangsaen21 is fast, festive and fiercely popular. The flat beachfront course along the Bangsaen coastline is purpose-built for quick times, and the finish-line party is the stuff of local running legend.
- Date: Sunday 20 December 2026
- Distance: Half marathon (21.0975km)
- Why run it: Platinum-label prestige, a lightning-fast course and one of the best race-day atmospheres in Thailand.
Register on the official Bangsaen21 site.
Chiang Mai Marathon — Chiang Mai, 20 December
The northern capital closes out the year with a cool, flat road race starting at the historic Tha Phae Gate. Runners loop the old city moat past Lanna temples with Doi Suthep watching over the skyline, all in the crisp December air that makes Chiang Mai such a rewarding place to run.
- Date: Sunday 20 December 2026
- Distances: Full marathon, half marathon, 10km and a 3km fun run
- Why run it: Cool weather, flat roads and Lanna heritage at every turn — a fitting finale to the Q4 season.
Entry via the official Chiang Mai Marathon site.
Before you register
A few practical notes to save yourself grief on race day:
- Register early. Thailand’s biggest races, Amazing Thailand Marathon Bangkok and Bangsaen21 among them, routinely sell out weeks or months in advance.
- Don’t swap bibs. The name on your race bib must match your registration. Transferring or selling a bib is treated as cheating and can earn multi-year bans from major organisers.
- Confirm the details. Annual races move around. Always double-check the date, start time and pick-up location on the official page before you travel, as some of the 2026 dates above are still subject to organiser confirmation.
In a marathon, there is nothing that matters more to the runner and the event makers than the bibs that are worn. These bibs are so integral that you can be disqualified for forgetting them or for handing them off to another person and having them wear them to the marathon.
For some help with the insights that I needed, I have talked to Patompong Suebklai (Air). He is a very avid runner who runs nearly every day and has participated in a lot of the marathons mentioned above (he even suggested some of the marathons in the list as well).
Word of advice for those who are aiming to run the marathon is that you should find out the time and place where you can receive the bibs. According to Air, his experience with the bibs is that they will be collected at a specified location the day before the marathon.
What the runner I consulted with also mentioned is that the bib is linked to your name because you registered for it, and the event organisers use this information to properly award you not only the prize but also the certificate confirming that you participated in and completed the marathon.
Any form of cheating in which you have registered the bib in one name and then handed it off to another person can get you banned. An example I was given was that the Bangsaen marathons will ban you for 5 years for both the Bangsaen42 and the Bangsaen21 races. You could try another marathon with a different organisation, but I doubt you would make it far if cheating is your approach.
Cooler mornings, spectacular scenery and a race for every ability, Q4 is the perfect time to lace up your shoes and discover Thailand one stride at a time. See you on the start line.
Also: Our pick of 5 cycling spots in Bangkok
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