2026 Denver Colfax Marathon Weekend is an amateur-enterable individual road-running event weekend in Denver, United States. Importance evidence: Official Run Colfax pages state May 16-17, 2026, registration, and describe Denver's Colfax Marathon as Denver's only marathon/biggest weekend; major regional public road-running weekend.
Date
May 16, 2026 - May 17, 2026
Distance
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Elevation
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Difficulty
Moderate