Trail Running calendar near Boulder 2026-2027

A multi-distance running festival in Eaton, Colorado on June 5–6, 2027 offering races from 7K to 100 miles, relay and virtual options on a 2 mile groomed dirt loop with aid stations, camping and glamping.

Trail races at Granby Ranch Resort in Colorado on June 12, 2027, across multiple distances including a 14-hour Elevation Challenge scored by total elevation climbed. The event uses mountain single-track, aid stations, drop bags, and has a 2..

A three day dirt festival in Alma, Colorado at 10,600 feet featuring mountain bike races, trail running, an off road duathlon, free kids races, and weekend camping in an alpine meadow.

A trail event near Parker Colorado featuring a 10k with a stepped incline, a kids one mile on the same start, age and gender based staggered starts, aid stations on the loop, and volunteer entry options.

Three day stage race offering Half Pint and Full Pint options July 26 to 28 2027 across three stages with published race guide and support services.