Aspen, Colorado Civic Calendar — 2026

Winter action-sports competition held annually at Buttermilk Mountain in late January.

Federal income tax returns due. Extensions filable via Form 4868.

Peak wildfire risk in the Colorado high country runs late spring through fall. Pitkin County issues fire restrictions and evacuation guidance during active conditions.

World-renowned classical music festival held in Aspen each summer, drawing students and artists from around the globe.

Commemorates Colorado's 1876 admission to the Union as the 38th state.

Aspen School District typically begins the academic year in late August.

General election day in even-numbered years.

Aspen Snowmass's four mountains typically open around Thanksgiving and run through mid-April, weather permitting.