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IRONMAN Japan South Hokkaido
IRONMAN Japan South Hokkaido is raced in Hokkaido, Japan (Swim 3.8 km · Bike 180.2 km · Run 42.2 km). Results from 3 editions (2024–2026), the course, race-day weather and water temperature.
- SwimOcean
- BikeFlat
- RunFlat
- High air temp23°C73°F
- Low air temp18°C65°F
- Avg. water temp24°C75°F
Temperatures: race-hours average over 1 editions
IRONMAN Japan South Hokkaido results
Fastest men
8:34:30
Okura Takuya · 2025
Fastest women
9:45:48
Larissa Marya Fabrini De Oliveira · 2025
Fastest edition
2026
median 13:33:49
Avg. age group · 2026
13:30:41
swim 1:24:27 · bike 6:42:05 · run 5:05:27
| Edition | Date | Finishers | Men | Women | Median | |
|---|---|---|---|---|---|---|
| 2026 | Sep 13, 2026 | 1094 | Grigorii Navrotskii 8:41:58 | Noriko Ichikawa 9:52:37 | 13:33:49 | Pacing |
| 2025 | Sep 14, 2025 | 1046 | Okura Takuya 8:34:30 | Larissa Marya Fabrini De Oliveira 9:45:48 | 13:42:32 | Pacing |
| 2024 | Sep 15, 2024 | 1310 | Kent Ohori 8:49:42 | Takahashi Kana 10:42:11 | 13:48:12 | Pacing |
IRONMAN Japan South Hokkaido course
The bike is flat, with ≈3,210 m (10,531 ft) of climbing on the bike and ≈120 m (394 ft) of climbing on the run.
Swim Bike Run · Watch the replay on the map →
Bike · 177.9 km111 mi · ≈ +3,210 m10,531 ft · from 3 to 274 m10 to 899 ft
Run · 41.9 km26.0 mi · ≈ +120 m394 ft · from 4 to 23 m13 to 75 ft
Difficulty
#25 hardest of 42
vs. the average IRONMAN: −1.7% · swim +0.9% · bike −1.1% · run −2.0%
Elevation filtered for terrain-model noise; a bike computer may read differently.
IRONMAN Japan South Hokkaido weather & water temperature
| Edition | Air swim / bike / run | Wind | Rain | Water | AG wetsuit |
|---|---|---|---|---|---|
| 2026 | 18°C65°F / 23°C73°F / 21°C70°F | 17 km/h11 mph | 0.0 mm0.00 in | 24°C75°F * | Legal |
| 2025 | — | — | — | 25°C76°F * | No |
| 2024 | — | — | — | 23°C73°F * | Legal |
* Satellite estimate (sea surface at start time). Wetsuit rules →
IRONMAN Japan South Hokkaido reviews
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