www.mammothendurance.com

Washington Island Ultra

Name: Washington Island Ultra
Start: 2026-07-23
End: 2026-07-24
Location: Washington County, Wisconsin

location_city Washington County

location_on Wisconsin

flag United States

calendar_today 23 Jul, 2026 – 24 Jul, 2026

kayaking Multisports

language Official Website

About the Event

Test your human limits in a remote island sanctuary on the Great Lakes. The Washington Island Mammoth Endurance 24 | 36 Hour Relay challenges solo athletes and teams from July 23rd to 25th, 2026, on a unique, loop-based course within Wisconsin's scenic Washington Island State Park. This event redefines toughness with a 0.25-mile swim in crystal-clear Lake Michigan, a fast 9.9-mile rolling bike loop on butter-smooth roads, and a pancake-flat 2-mile run along the shore—all repeatable within a controlled, crew-friendly race village. Designed for maximum safety and involvement, the shorter loops allow for incredible spectator support and a deeply communal atmosphere under vast starry skies. Whether you're chasing a solo ultra-distance or sharing the relay with friends, discover what it truly means to "Be More Human" in this pristine Midwestern wilderness. Claim your spot for an unforgettable endurance festival.

Races Offered

36 Hour

Jul 23, 2026

straighten

Distance — 36H

terrain

Type — Triathlon

timer

22:00

24 Hour

Jul 24, 2026

straighten

Distance — 24H

terrain

Type — Triathlon

timer

10:00

Weather Overview

These values represent the 3-year monthly averages for July in Washington County.

Temp (°C)

Feels Like (°C)

thermostat 16.9° / 26.8°

wb_sunny 16.4° / 26.5°

Wind (km/h)

Humidity (%)

air 10.5 /

water_drop 70.9%