Boulder Marathon
- When
- Sun, Sep 28, 2025, 4:00 AM
- Where
- Boulder, United States
- Distances
- 5K · 10K · Half Marathon · Marathon
- Terrain
- Rolling
- Price
- 37.45–159.43 USD
- Elevation gain
- 293 m
- Typical weather
- Mild
- Organizer
- BOLDERBoulder
About
The Heart to Heart 5K, part of the Boulderthon event, invites participants to a 3.1-mile race through downtown Boulder on September 28, 2025. Organized by Stronger Faster Boulder Co, this course features a slight 37-meter elevation gain, making it fun and accessible for all.