AOL Travel

Boulder When To Go and Weather

Peak Season June - September

If it must be narrowed down to a particular time of year, summer is peak season in Boulder. Then again, so is every weekend that the University of Colorado football team has a home game. Same goes for such important events as the Conference on World Affairs (early April), the Bolder Boulder 10K Road Race (Memorial Day Weekend), the three CU graduations every year and the weeks when students are moving in and out, often with parental assistance. May and June weekends are popular for weddings and can get pretty peak-ish too. That said, summer weather here is beautiful—warm days and cool nights— and it's the best time to visit Boulder.

Off-Season January - March

Mid-winter is as off-season as Boulder ever gets. Lodging rates might drop midweek and sometimes on weekends. Then again, often they don’t.

Shoulder Season April - May, October - December

With so much visitation to the University of Colorado, the National Center for Atmospheric Research, the National Institute of Standards and Technology and assorted high-tech, research and sporting-goods businesses, including sexy start-ups, business travelers occupy hotel rooms much of the year.  

Boulder, CO Weather Forecast

7-Day Forecast

  • Tue


    Mostly Sunny

    66  39

  • Wed


    Mostly Sunny

    68  41

  • Thu


    Mostly Cloudy

    70  45

  • Fri


    Isolated Thunder- storms

    64  42

  • Sat


    Scattered Showers

    69  43

  • Sun


    Mostly Sunny

    69  44

  • Mon


    Partly Cloudy

    74  45