Best Time to Visit Boulder
When to visit Boulder, Colorado: the best months, shoulder seasons and what weather to expect, based on its temperate climate.
Boulder has a temperate climate with four distinct seasons. The warmer half of the year (May to September) brings the longest days and the most settled weather — the most popular time to visit.
Late spring and early autumn (April–May and September–October) are excellent shoulder periods: pleasant conditions with thinner crowds than peak summer. Winters are cold and quieter.
Frequently asked questions
The best time to visit Boulder is generally May to September, given its temperate climate. Boulder has a temperate climate with four distinct seasons. The warmer half of the year (May to September) brings the longest days and the most settled weather — the most popular time to visit.