Marathon2027

Boulder Marathon

Sunday, September 26, 2027

Boulder, CO · Confirmed with the organizer, checked October 3, 2026

Save it in The Corral: a countdown to the start, and a cheer link your people open without the app. They pick a spot and leave an audio cheer that plays as you reach it.

Free on the App Store

Registration

Official site: boulderthon.org

About the race

Flatirons backdrop. Boulder Reservoir loop, classic Front Range.

More races coming up

Rim Rock MarathonNov 1
BolderBOULDER 10KMay 31, 2027
Steamboat HalfJun 6, 2027
Estes Park HalfJun 20, 2027
Estes Park MarathonJun 20, 2027
Hardrock Hundred Endurance RunJul 9, 2027