Spring
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Daytime highs averaging 65°F (18°C) and lows around 40°F (4°C) create ideal conditions for hiking Chautauqua Park's Flatirons or biking Boulder Creek Path.
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Vibrant wildflowers like Rocky Mountain columbines and Pasque flowers paint the foothills and trails of Open Space and Mountain Parks from late April through June.
Summer
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Sunny days with highs around 85°F (29°C) and low humidity make it comfortable to explore attractions like Pearl Street Mall or cool off tubing Boulder Creek.
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Don't miss the Colorado Shakespeare Festival (June-August), Downtown Boulder Art Fair (May), or Colorado Renaissance Festival in nearby Larkspur (June-August).