Run under the midnight sun at Alaska’s ultimate endurance challenge!
Overview
Test your endurance in the land of the midnight sun — no headlamps required! The Alaska Endurance Trail Run is a fixed-time ultramarathon featuring 6-, 12-, and 24-hour races on a scenic loop around the University of Alaska Fairbanks West Ridge trails. Walkers and runners welcome. How far can you go before the clock runs out?
Course
Single-track and rolling trails, mild climbs, no major elevation. 6+ mile loop, repeat as many times as possible within time limit. Boreal forest, summer solstice light — run under the midnight sun!
Logistics
Swag & Medals
Awards for top performers
Post-race BBQ and celebration
Getting There
Driving Directions
Requirements
Open to runners and walkers
Minors 12–17 welcome with parent/guardian on-site
Bring your own hydration system
Policies
Race Policies
No refunds; limited credits for special circumstances
Cup-free race
About Alaska Endurance Trail Run
The Alaska Endurance Trail Run (AETR) races offers a distinctive blend of endurance, nature, and community, capturing the adventurous spirit of Alaskan running. Whether you’re chasing mileage goals, training for your next big race, or simply seeking a fun challenge in the land of the midnight sun, AETR is a true celebration of human endurance in the Far North.
The Alaska Endurance Trail Run is a grassroots, community-driven ultramarathon event held annually in Fairbanks, Alaska. Founded and directed by Don Kiely, AETR is a timed-format race where participants aim to cover as much distance as possible within a set time frame of 6, 12, or 24 hours. Since its inaugural year in 2015 (with a brief COVID-related cancellation in 2020), the event has grown into a beloved endurance challenge in Interior Alaska.
Taking place on the mildly hilly trails of the University of Alaska Fairbanks (UAF) West Ridge, the race offers a 6+ mile loop that is both accessible and demanding—designed to test the stamina of runners and walkers alike without requiring technical trail experience. With multiple start times spread across Friday night and Saturday, participants can tailor their experience and choose to race through the midnight sun or in broad daylight.
Disclaimer
We make every effort to provide accurate and up-to-date information on Kåduka, but details may change. Please always confirm the latest information on the official race website. See something that needs correcting? Send us a note at [email protected]