Sign In Sign Up

eventdev.osaka-triathlon.com

Osaka Castle Triathlon

location_city Osaka

flag Japan

calendar_today 31 May, 2026

kayaking Multisports

language Official Website

Register

About the Event

Dive into the heart of Osaka at the Osaka Castle Triathlon 2026, a premier urban triathlon designed for both elite athletes and aspiring participants. The swim takes place in the calm, historic waters of the castle moat, providing a scenic and accessible start. With convenient bike rental support packages available, the race is more attainable than ever. The fast and spectator-friendly bike and run courses weave through the city, ensuring incredible crowd support as you race towards a triumphant finish with the majestic castle as your backdrop. It's the perfect gateway to experiencing Japan's vibrant triathlon culture.

Races Offered

Sprint

May 31, 2026

straighten

Distance — 20 km 5 km

terrain

Type — Triathlon

timer

151 days remaining

Standard

May 31, 2026

straighten

Distance — 40 km 10 km

terrain

Type — Triathlon

timer

151 days remaining

Weather Overview

These values represent the 3-year monthly averages for May in Osaka.

Temp (°C)

Feels Like (°C)

thermostat 14.6° / 21.3°

wb_sunny 12.9° / 20.3°

Wind (km/h)

Humidity (%)

air 13.1 /

water_drop 76.1%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 14.6° / 21.3°

wb_sunny 12.9° / 20.3°

air 13.1 km/h

water_drop 76.1%

About Osaka

Scenic view of

Ōsaka (大阪) is the beating heart of Japan's Kansai region and the largest of the Osaka-Kobe-Kyoto trio of cities, with a population of over 17 million people in the greater metropolitan area. With fantastic food and nightlife, great connectivity and accommodation options in every price bracket, it makes a great base for exploring the entire region.

Read more launch

Hotels & Places to Stay

Nearby Races

Kaga Spa Trail Endurance 100 by UTMB

location_on Kaga, JP

calendar_today Jun 20, 2026

Other 20K Ultra

Trail Runners Cup Ishikawa Okuradake

location_on Komatsu, JP

calendar_today May 17, 2026

5K 15K

Shimanami Surround

location_on Hiroshima, JP

calendar_today May 24, 2026

Marathon Ultra

Carter Memorial Kurobe Meisui Marathon

location_on Kurobe, JP

calendar_today May 23, 2026

5K 10K Marathon

Recommended for You

Hand-picked events we think you’ll love.

Our pick

Nov 21, 2026

Run Manatee - Rye Preserve 5K -2026

The RUN Manatee 5k series offers THREE adventures to celebrate ONE community. Participants will discover Manatee County…

Our pick

Nov 28, 2026

Turkey Trails - Sioux Falls

Join us for the annual Turkey Trails 5k/10k! A fun, Thanksgiving-themed event that is perfect for the whole family.The…

Our pick

Dec 13, 2026

Candy Cane Course- Lincoln

Join us for the annual Candy Cane Course 5k/12k! A fun, Christmas-themed event that is perfect for the whole family.Th…

Our pick

Mar 21, 2027

Space Coast Triathlon and Duathlon

WE ARE NOW OFFERING AN AQUABIKE DIVISION! Triathlon Information:Join us for the annual Space Coast Triathlon, held in …