13.1Miles
Race archive · Half Marathon
Boulderthon Half Marathon: American Results
Boulder, Colorado
Recorded American finishes and sourced announced entries from 2025–2026. Open a year for its coverage and the runners' profiles. These pages are not a complete official field.
Boulderthon Half Marathon: race context
Boulderthon offers a marathon, half marathon and shorter races in Boulder, Colorado. Only half-marathon records appear here, even when a source’s event label also mentions the 10K. Historical spelling variants are grouped into one half-marathon archive.