21.0975 km
Distance
287 m
Elevation Gain
2:02:45
Average Finish Time
38,000
Total Finishers
1979
Established
Rolling
Profile
Get Your Training Plan
Free, personalized for this race
Course & Elevation
The Bolder Boulder courses from the University of Colorado campus down Flagstaff Road with scenic mountain views of the Flatirons, then through downtown Boulder with its iconic Pearl Street Mall finish. The race features a net downhill elevation profile with rolling terrain through residential neighborhoods and parks.
🌤️ Weather
Late May in Boulder offers pleasant spring weather with cool mornings and mild afternoons. Altitude of 5,430 feet can affect sea-level runners during acclimatization.
🏆 Course Record
00:59:43
Moses Kemboi (2016)
Registration
Register Now
Official Website →
🎯 Fun Facts
- ▸ The Bolder Boulder is America's largest half-marathon with over 38,000 finishers annually, drawing crowds to Boulder's Pearl Street for the iconic finish line celebration.
- ▸ Founded in 1979 by local resident Abert Bragg, the race has become a Memorial Day tradition and fundraiser for Boulder Valley School District.
- ▸ Runners finish on the closed Pearl Street Mall, one of the most photogenic and celebrated race finishes in North America with street performers and live music.
- ▸ The race's elevation start of 5,430 feet and rolling course make it a legitimate altitude challenge despite the downhill overall profile.
Get race tips & guides in your inbox
Race tips, training guides, and the latest from 500+ races worldwide.