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Green Mountain Loop is a 7.2 mile, heavily trafficked loop trail in Boulder, CO, featuring wildflowers. Best used between March and November, this hard difficulty trail includes Chautauqua, Meadow, Gregory Canyon, Amphitheater, Upper Saddle Rock, EM Greenman, West Ridge, Ranger, and Baseline Trails for a refreshing view. Bluebell-Baird also is located along the loop for an extra workout.