A Colorado trail race series
Welcome to
Yay Ultra
Yay Ultra puts on low-key, well-run trail races close to home: backyard ultras, loop courses, and the kind of start line where first-timers and veterans line up side by side.
Yay Ultra puts on low-key, well-run trail races close to home: backyard ultras, loop courses, and the kind of start line where first-timers and veterans line up side by side.
One in the books, more on the way. New races get announced here first.
Inaugural · 2026A 4.167-mile loop every hour, on the hour, until the park closes. The race that started it all.
Visit the race site →The simplest race there is, and one of the hardest. It rewards patience and consistency over raw speed, and there's no finish line until everyone else stops.
Each lap (a "yard") is about 4.17 miles. Every runner starts together at the top of the hour.
Get back before the next hour starts. Rest, refuel, and line up again.
Miss a start and you're out. The last runner to complete a loop alone wins.
One loop is a great day. Seven is a marathon and then some. Twenty-four is 100 miles. Go as far as you want.
New races, registration openings, and volunteer calls get posted on Instagram first.