What's on in Boulder, United States through the year

Busy — Winter / Christmas break in United States, school holidays in 2 of the markets that fill it

Nothing new starts in January.

Still on: Chinook windstorms (1 Nov – 31 Mar (usually))

Quiet — one of its worst months for weather

Nothing new starts in February.

Still on: Chinook windstorms (1 Nov – 31 Mar (usually))

Busy — Spring break in United States

• Season

  Heavy spring snow

  1 Mar – 30 Apr · usuallyOff-season shutdownClosures

  March and April are the snowiest months on the Front Range, and it arrives as wet upslope storms that take down trees and shut the airport for a day. It is gone off the streets within forty-eight hours; the trails stay mud for a week. Source ↗

Still on: Chinook windstorms (1 Nov – 31 Mar (usually))

Shoulder season — an ordinary month

• Nature

  Foothills wildflowers

  20 Apr – 10 Jul · usuallyWildflowers & blooms

  Colour works uphill from the Mesa Trail meadows in late April to the high meadows above town by early July. The Chautauqua trailhead lot fills by eight on a weekend; the shuttle exists for a reason. Source ↗

Still on: Heavy spring snow (1 Mar – 30 Apr (usually))

Busy — Bolder Boulder 10K

• Festival

  Bolder Boulder 10K

  24–31 May · usuallyMajor festivalCrowdedClosuresBook early

  Fifty thousand runners set off in waves on Memorial Day Monday and finish inside the CU stadium for the noon tribute. Half the city centre is closed to cars for the morning, and the neighbourhood bands along the route are the point. Source ↗

Still on: Foothills wildflowers (20 Apr – 10 Jul (usually))

Busy — Summer break in United States, school holidays in 2 of the markets that fill it

• Festival

  Colorado Music Festival

  25 Jun – 5 Aug · usuallyMajor festivalBook early

  Six weeks of orchestral concerts in the wooden Chautauqua Auditorium, doors and windows open onto the Flatirons. Bring a layer — the building has no air conditioning and no heating, and the evenings turn cold fast. Source ↗

Still on: Foothills wildflowers (20 Apr – 10 Jul (usually))

Busy — Summer break in United States, school holidays in 2 of the markets that fill it

• Hazard

  Afternoon thunderstorms

  1 Jul – 31 Aug · usuallyStorm season

  Storms build over the Divide most afternoons and reach the foothills between one and four, with lightning that kills hikers on exposed ridges every few years. The local rule is to be off the high ground by noon. Source ↗

Still on: Foothills wildflowers (20 Apr – 10 Jul (usually)), Colorado Music Festival (25 Jun – 5 Aug (usually))

Busy — Summer break in United States, school holidays in 2 of the markets that fill it

Nothing new starts in August.

Still on: Colorado Music Festival (25 Jun – 5 Aug (usually)), Afternoon thunderstorms (1 Jul – 31 Aug (usually))

Busy — Summer break in United States

Nothing new starts in September.

Shoulder season — an ordinary month

Nothing new starts in October.

Busy — Thanksgiving break in United States

• Hazard

  Chinook windstorms

  1 Nov – 31 Mar · usuallyWind season

  Air spilling off the Divide accelerates down the canyons and hits the west side of town at motorway speeds several times a winter, taking out power and lorries on the Foothills Parkway. It is also why the snow never lies here for long. Source ↗

Busy — Winter / Christmas break in United States, school holidays in 2 of the markets that fill it

Nothing new starts in December.

Still on: Chinook windstorms (1 Nov – 31 Mar (usually))