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New year, new (triathlon) season! Maybe even a new age group for some of you!
We've compiled a comprehensive list of triathlons taking place in 2025 that range from T100-style distances to the full long course triathlon - and everything in between. If there's one thing about middle distance triathlon in Japan, it's that there are no rules regarding distance. What that means is that swims may range from 2k to 4k; bikes from 70-something to 190; and the run might be from 18 to the full marathon.
Take note that some races, especially those in the second half of the year have only announced a tentative date. As per usual, the season starts in Okinawa in April and ends in Okinawa in November. Triathlons are scarce in July and August due to the heat and humidity of summer in Japan - it's a lot of liability for race organizers to bear (and you don't want to race in that, trust us!).
Keep in mind that many (but not all) triathlons require Japan Triathlon Union (JTU) membership to sign up. JTU membership is only available to residents of Japan. In recent years, some races have began to offer one-day memberships for an additional fee (typically 2-3,000 JPY). Whatever your circumstances are, contact us if you'd like to learn more about racing in Japan.
(last updated Apr 24, 2025)
We've compiled a comprehensive list of triathlons taking place in 2025 that range from T100-style distances to the full long course triathlon - and everything in between. If there's one thing about middle distance triathlon in Japan, it's that there are no rules regarding distance. What that means is that swims may range from 2k to 4k; bikes from 70-something to 190; and the run might be from 18 to the full marathon.
Take note that some races, especially those in the second half of the year have only announced a tentative date. As per usual, the season starts in Okinawa in April and ends in Okinawa in November. Triathlons are scarce in July and August due to the heat and humidity of summer in Japan - it's a lot of liability for race organizers to bear (and you don't want to race in that, trust us!).
Keep in mind that many (but not all) triathlons require Japan Triathlon Union (JTU) membership to sign up. JTU membership is only available to residents of Japan. In recent years, some races have began to offer one-day memberships for an additional fee (typically 2-3,000 JPY). Whatever your circumstances are, contact us if you'd like to learn more about racing in Japan.
(last updated Apr 24, 2025)
APRIL
20 39th Miyakojima Triathlon (Okinawa)
MAY
25 Nagaragawa Middle Triathlon 102 (Gifu)
JUNE
1 Sai no Kuni Triathlon in Kazo (Saitama)
JULY
20 43rd Kaike Triathlon (Tottori)
AUGUST
24 Hokkaido Triathlon (Hokkaido)
SEPTEMBER
7 Sado International Triathlon (Niigata)
NOVEMBER
16 2nd Okinawa Kin Triathlon (Okinawa)
20 39th Miyakojima Triathlon (Okinawa)
- S 3k, B 123k, R 35k
- Lottery Applications: Oct 1-31, 2024 (results Nov 22)
MAY
25 Nagaragawa Middle Triathlon 102 (Gifu)
- S 2k, B 80k, R 20k
- General Entry: Jan 23-Mar 30, 2025
- Middle (S 2.25k, B 71k, R 20k)
- Long (S 3k, B 116k, R 42k)
- General Entry: from Jan 4, 2025
JUNE
1 Sai no Kuni Triathlon in Kazo (Saitama)
- A (S 2.25k, B 72k, R 15k)
- B (1.5k, B 43k, R 10k)
- C (S 750m, B 21.6k, R 5k), Junior (S 200m, B 7.2k, R 2.5k)
- General Entry: Feb 8-May 10, 2025
- S 1.8k, B 80k, R 18k
- General Entry: Feb 10-Apr 30, 2025
- A Type: S 3k, B 154.8k, R 42.2k
- B Type: S1.6k, B 101.7k, R 21.1k
- General Entry: Dec 20, 2024-Jan 31, 2025 (lottery)
- S 2k, B 75k, R 20k
- General Entry: Dec 2, 2024-Mar 31, 2025
- S 1.9k, B 66.2k, R 20k
- General Entry: Dec 20, 2024-Apr 30, 2025
- S 1.9k, B 80k, R 20k (and Standard Distance)
- General Entry: Feb 1-Mar 31, 2025
JULY
20 43rd Kaike Triathlon (Tottori)
- S 3k, B 140k, R 42.2k
- Lottery Applications: Mar 1-31, 2025 (results Apr 24)
- S 2.25k, B 55.3k, R 14.4k (and other distances)
- General Entry: Mar 6-Jun 15, 2025
AUGUST
24 Hokkaido Triathlon (Hokkaido)
- A Type: S 2k, B 137.1k, R 23.1k
- B Type: S 2k, B 91.9km R 23.1km
- General Entry: Jan 31-Jul 4, 2025
SEPTEMBER
7 Sado International Triathlon (Niigata)
- Type A: S 4k, B 190k, R 42.2k
- Type B: S 2k, B 108k, R 21.1k
- General Entry: from Feb 1, 2025 (lottery if registrations exceed capacity)
- Second Round: Apr 10-27, 2025
- Type A: S 2.25k, B 70k, R 18k
- Type B: S 1.5k, B 42k, R 10k
- General Entry: Mar 29-May 7, 2025
- S 3.8k, B 180k, R 42.2k
- General Entry: from Dec 16, 2024
- S 1.9k, B 90k, R 21k (and Standard)
- General Entry: Mar 14-Aug 31, 2025
- S 2k, B 71k, R 20k (and other distances)
- General Entry: TBA
NOVEMBER
16 2nd Okinawa Kin Triathlon (Okinawa)
- S 2k, B 70k, R 22k
- General Entry: May 1-Jun 30, 2025
- S 2k, B 66k, R 20k
- General Entry: TBA
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