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Four races anchor this stretch of Malaysia's 2026 calendar, all part of the JomRun-powered series and all offering the same 21.1/10/5km lineup so a 10K sits alongside a half marathon and 5K at every stop. The season runs from mid-August through the end of October, starting in Kuala Lumpur, moving to Rawang in Selangor, then Johor Bahru, and finishing in Kuala Terengganu on the east coast. September is the busiest month with two races three weeks apart. The choice comes down mainly to location and timing rather than distance options, since every event covers the same three race lengths.

Every 10K on this list falls in a single two-week window, August 15 to 30, 2026 -- a reflection of how densely the Philippines' race calendar clusters mid-month rather than any real scarcity of 10K options elsewhere in the year. The National MILO Marathon alone contributes two legs, in Dipolog City and Cagayan de Oro, while the rest spans from Davao and Iloilo in the south to Clark and Tarlac north of Manila, plus city races in Pasay and Taguig. Almost every event pairs the 10K with a half marathon and 5K at the same start line -- the PMC Kabayanihan Run in Taguig goes furthest, adding a 50km ultra option alongside the shorter distances. With this many races landing in the same fortnight, the real constraint is logistics rather than finding a race date.

The calendar runs from September 2026 through to the Amazing Thabo Midnight Marathon in May 2027, with Bangkok hosting four of the fifteen races -- more than any other city -- and Chiang Mai close behind with three. Two dates carry a same-day clash: December 20 pairs the Bangkok Midnight Marathon with the Muang Thai Chiang Mai Marathon, and January 10, 2027 does the same with the 37th Bangkok Marathon and the Khao Yai Marathon in Pak Chong. Beyond the two anchor cities, the set reaches into Pattaya, Nakhon Ratchasima, Nong Khai and the northern hills around Mae Moh and Lampang. Distances are consistent -- almost every race pairs the 10K with a half and full marathon -- so the choice is mostly about city, season, and which of the overlapping dates you'd rather commit to.

The 10K almost never stands alone here — it's typically the middle option at an event built around a half marathon, with a 5K underneath it for the same crowd. Coverage skews heavily toward the Philippines, which runs a dense weekend calendar of city and provincial races nearly year-round, with Malaysia's JomRun series and scattered events across Indonesia and Thailand filling out the rest. Because so many hosts bundle the 10K in with longer distances at the same start line, picking one is less about finding a 10K specifically and more about finding a race day with the right overall lineup.

Fifteen races across Malaysia bundle a 5K into their lineup between mid-August and mid-November 2026, almost all of them JomRun-powered half marathons that pair 21.1km with 10km and 5km on the same morning. Kuala Lumpur alone contributes three -- the KL Half Marathon, Malaysia Marathon, and KLSCM -- while the rest spreads from Kota Kinabalu and Kuching in East Malaysia to Johor's Tebrau City, Mersing, Puchong and Kulai races in the south, and Kota Bharu, Jitra and Kuala Terengganu further north. October is the busiest month, with five races inside four weeks. As with the rest of the JomRun calendar, the 5K is consistently the entry-level option rather than a race anyone travels for on its own.

The 5K here is almost never a race in its own right -- it's the entry-level option bundled into a bigger event alongside a 10K and usually a half or full marathon, aimed at families, first-timers, and anyone tagging along without training for the longer distance. Coverage leans heavily toward the Philippines, which runs the densest weekend calendar of multi-distance events in the region, with Malaysia's JomRun series and individual races in Indonesia and Thailand rounding out the field. Because the 5K rides along with longer distances rather than anchoring its own event, the choice usually comes down to which race day's overall lineup and location fit best.

Seven full marathons run across Indonesia between August and November 2026, and August alone carries three of them, so runners chasing a fall marathon here have decisions to make early in the season. The set ranges from Bekasi and Depok on Java's dense urban fringe to the volcanic highlands of Tosari for the Bromo Marathon and the temple approach of the Bank Jateng Borobudur Marathon in Magelang. Bali's Gianyar hosts the Maybank Marathon in August, while Jakarta stretches its running festival across four days in October. Every race pairs the 42.195km distance with shorter options, from half marathons down to 2.5km fun runs, so the choice often comes down to setting and month rather than distance alone.

August is the busiest month on this list, with five full marathons running from Bintulu on the 2nd to Alor Setar, Malaysia Marathon in Kuala Lumpur, and the Travis Hegel Marathon du Trans Penang all landing before the month is out. The other cluster comes in November, when Bentong, Sandakan, Sibu and Selangor's Cyberjaya race fall within weeks of each other. Between these two peaks you're choosing between East Malaysian courses in Sarawak and Sabah (Bintulu, Kuching, Sibu, Sandakan) and Peninsular races stretching from Alor Setar in the north to Kuala Terengganu on the east coast. Kuala Lumpur anchors the calendar with the Standard Chartered marathon in October, while things thin out to single races in December, January and as far ahead as April 2027 in Terengganu.

August and September carry the bulk of this calendar, with nine and eight races respectively before things thin out toward year-end and a single January date in Cebu closes the cycle. The spread runs from Luzon towns like Agoo and Pulilan to island settings such as Panglao in Bohol and Siquijor, plus established city races in Cebu, Manila, and Lapu-Lapu. Scale varies widely too: some events pair the 42.195km distance with just a half and 10km, while others like iRun Subic Bay and KCC GenSan offer the full marathon as a standalone race. Anyone comparing options is really choosing between a compact provincial run and a larger multi-distance event with an international field.

Hanoi anchors this list more than any other city, hosting four separate full marathons between October 2026 and November 2026 alone, from the Techcombank Hanoi International Marathon to the VnExpress Marathon Hanoi Midnight. The calendar runs from an August start in Huế and Nha Trang through to the Danang International Marathon in March 2027, with November the busiest single month at three races. Beyond Hanoi, the set spreads across coastal and heritage cities including Ha Long, Hải Phòng, Huế, Da Nang, Nha Trang, and Ho Chi Minh City. Distances are broadly similar across entries, all built around the 42.195km/21.1km pairing, but the number of shorter companion distances offered alongside the marathon varies from race to race.

Southeast Asia's marathon season clusters hard into the cooler months: the calendar thins through the middle of the year, then fills sharply from August onward as organisers move away from the worst of the heat. What you're choosing between spans city centre races through Manila, Bangkok and Kuala Lumpur, island courses in Bohol and Phuket, and provincial events that draw a few hundred runners. Most pair the 42.195km distance with shorter legs at the same start line, so a marathon weekend is usually a full-distance event rather than a single race.

Thailand's full marathons run from big-city road races in Bangkok and Chiang Mai out to provincial events in Nakhon Ratchasima, Khon Kaen and Songkhla that most visitors never hear about. The calendar leans heavily on the November-to-February window, when the northeast monsoon has passed and mornings are genuinely cool by regional standards. Fields vary enormously in size, and several of these are AIMS-certified courses, which matters if you're chasing a qualifying time rather than a weekend away.

Twenty-four half marathons spread from the volcanic crater trails of Banyuwangi's Ijen Geopark Run to the reef-fringed roads of Belitung and the beach town of Senggigi on Lombok, with Java hosting the bulk of the action across Jakarta, Bandung, Surabaya, Yogyakarta, and Kota Batu. September and October are the busiest stretch, carrying 15 of the 24 races between them, including the Garmin Run Asia Series in BSD City and the Locomotive Half Marathon in Bandar Lampung. Most events pair the 21.1km distance with 10km and 5km options, though a few, like Bayan Run in Balikpapan and Banka Run Fest in Belitung, add shorter 2.5km or 0.8km fun runs, and Carabao Half Marathon in Kota Batu goes the other direction with a full marathon on the same day. Beyond the September-October rush, smaller windows open in January, March, April, and May for races like Ciletuh Geopark Run and Belitong Geopark Run.

Thirty-three half marathons run across Malaysia in the back half of 2026, with August and October each hosting ten races and forming the busiest stretch of the calendar. Putrajaya anchors the list with multiple events of its own, including the Garmin Run Marathon Series and CIDB Half Marathon, while the rest of the field spreads from Miri and Kota Kinabalu in the east to Jitra and Kota Bharu in the north and Kluang, Kulai and Mersing in the south. Most events pair the 21.1km distance with shorter 10km and 5km options. Choosing between them mostly means picking a state, a month, and whether you want a standalone half or a multi-distance race day.

Half marathon season in the Philippines runs hot from August through September, with 35 of the 50 races on this list falling in those two months alone before things taper off toward December. Cebu City and Pasay anchor much of the calendar, each hosting several separate events, while the rest of the field stretches from Clark and Pampanga down through Iloilo, Davao, Cagayan de Oro, and smaller regional stops like Guinobatan, Baao, and Dipolog City. Most races pair the 21.1km distance with 10km and 5km options, though a few, like Dagan Cebu, add a 16km or 12km tier. The choice comes down to timing your training around the August-September crunch versus the quieter, more spread-out October-to-December window.

All four half marathons on this list happen in Singapore itself, packed into a tight six-week window from late September to early November 2026. The Kiprun Singapore opens the season on September 27, followed by the Singapore Half Marathon Powered By JomRun on October 11, Garmin Run Singapore on October 25, and the Great Eastern Women's Run closing it out on November 1. Every event pairs the 21.1km distance with shorter options, from 10km down to a symbolic 0.1km at the Great Eastern Women's Run. The real choice here comes down to which weekend suits you and whether you want a mixed-field race or the women-only format.

Nine half marathons spread across Thailand, with Bangkok appearing twice and Chiang Mai hosting two separate events of its own. The calendar clusters heavily into the final third of the year: two races in September, one in October, two in November, and two more in December, before a gap until single events in January and May 2027. Runners are choosing between very different settings — a Bangkok night race, a beach town in Bangsaen, the hills around Chiang Mai and Mae Moh, and coastal Krabi at Ao Nang. Most events measure the full 21.1km alongside shorter 10km, 5km, or 3km options run on the same day.

Every half marathon on this list belongs to a full-distance event -- Vietnam doesn't really run standalone half marathons, it runs marathons with a 21.1km option built in, so this set overlaps heavily with the country's marathon calendar. Hanoi anchors it with four races between October and November, from the Techcombank Hanoi International Marathon through to the VnExpress Marathon Hanoi Midnight, while Ho Chi Minh City, Ha Long and Hải Phòng each contribute one. The season opens in Huế in August and runs through to the Danang International Marathon in March 2027, with three races landing in November alone. The real decision is which full-event weekend to build a trip around, since the half marathon itself is rarely the headline distance.

The half marathon is the region's default distance, and the range reflects that: everything from major-city races with tens of thousands of entrants to small municipal runs where the 21.1km is the longest thing on offer. Coverage is heaviest in the Philippines and Malaysia, with strong showings in Indonesia and Thailand. Because most events stack 21.1km alongside 10K and 5K legs at the same venue, a half marathon here is usually one option within a larger race day rather than a standalone event.