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Course HighlightsThe Colfax Marathon is the ultimate urban tour of Denver, starting and finishing at Ferril Lake in City Park at 5,280 feet — Mile High elevation. The marathon course winds through Denver's most iconic landmarks: runners pass through Empower Field at Mile High on the warning track (twice!), traverse a full mile inside Denver Zoo with elephants, giraffes, zebras, and lions as live spectators, high-five firefighters inside Denver Fire Station #1, and take in sweeping views of the Rocky

What Race To Run is your global guide to finding the perfect race — from local 5Ks to international marathons, obstacle races to trail ultras. We catalog 388+ races across 45 states and 65 countries.
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