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Draft data. Times, fares and step counts are desk estimates awaiting field checks. Unknown times stay unknown. How we verify

When to go · Boulder

Boulder, month by month

The best months for Boulder: May, Jun, Sep, Oct. Months to avoid: Jan, Feb, Jul, Aug.

Month by month

  1. JanuaryAvoidListed as a month to avoid: Jul–Aug (afternoon storms), Jan–Feb (cold, snow).8 °C / -6 °C, 5 rain daysCrowds: Low
  2. FebruaryAvoidListed as a month to avoid: Jul–Aug (afternoon storms), Jan–Feb (cold, snow).9 °C / -5 °C, 5 rain daysCrowds: Low · 1 festival or holiday
  3. MarchGoodOutside the best window (May–Jun, Sep–Oct). Across United States: Spring break fills Florida beaches and parks; the desert parks come into season.14 °C / -2 °C, 7 rain daysCrowds: Medium · 2 festivals or holidays
  4. AprilGoodOutside the best window (May–Jun, Sep–Oct). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.17 °C / 1 °C, 8 rain daysCrowds: Medium · 1 festival or holiday
  5. MayGreatInside Boulder's best window: May–Jun, Sep–Oct.22 °C / 6 °C, 9 rain daysCrowds: Medium · 1 festival or holiday
  6. JuneGreatInside Boulder's best window: May–Jun, Sep–Oct.28 °C / 11 °C, 7 rain daysCrowds: High
  7. JulyAvoidListed as a month to avoid: Jul–Aug (afternoon storms), Jan–Feb (cold, snow).31 °C / 14 °C, 7 rain daysCrowds: High · 1 festival or holiday
  8. AugustAvoidListed as a month to avoid: Jul–Aug (afternoon storms), Jan–Feb (cold, snow).30 °C / 13 °C, 7 rain daysCrowds: High
  9. SeptemberGreatInside Boulder's best window: May–Jun, Sep–Oct.26 °C / 9 °C, 6 rain daysCrowds: Medium · 1 festival or holiday
  10. OctoberGreatInside Boulder's best window: May–Jun, Sep–Oct.19 °C / 3 °C, 5 rain daysCrowds: Medium
  11. NovemberMixedOutside the best window (May–Jun, Sep–Oct). Across United States: Quiet between holidays; Thanksgiving week is the busiest travel period of the year.12 °C / -2 °C, 5 rain daysCrowds: Medium · 1 festival or holiday
  12. DecemberMixedOutside the best window (May–Jun, Sep–Oct). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.8 °C / -6 °C, 5 rain daysCrowds: High · 1 festival or holiday