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BOULDERTHON MARATHON
September 2026
26.2 mi
Distance
571 ft
Elevation
Boulderthon Marathon route
The Boulderthon Marathon covers 26.2 mi through Boulder, CO. Explore the full course below — the route and where it starts and finishes — then make it your own as a poster of the race you ran.
- 2026 date
- September 27, 2026
- Location
- Boulder, CO
- Distance
- 26.2 mi
- Elevation gain
- 571 ft
Create your Boulderthon Marathon poster
Personalize the colors, text and map style — printed and shipped worldwide.