Hawaii Kai Ultra Run XTreme Honolulu, HI   Jul 25–26, 2026

The Hawaii Kai Ultra Run takes place semi-annually on the far east end of Oahu. This fun event is designed to challenge runners to take on new distances with the support and camaraderie of fellow runners. Official times are recorded for qualifying purposes for the 50 States Marathon Club, and Marathon Maniacs. There are no age group awards. It’s a personal challenge. Finisher certificate and customized award for all registered finishers.

Main differences between the XTreme in July and the Kalama Valley in December is the route and temperature. The XTreme is the Long Course: 9 miles including Heartbreak Hill (Koko Crater). And, summer temperatures are 5 to 10 degrees warmer. The Kalama Valley takes place one week after the Honolulu Marathon and is the Short Course: 3 mile loop.

Choose your distance and your own start time (options for the Half Marathon, 30K, and Marathon distances only).

If you enjoy running with your peers, we are offering corral selections with set wave start times. Selections may be made when registering for the Half Marathon, 30K, and Marathon distances.

Course: 9-mile loop with aid stations approximately 2.5 miles apart.