Music in the Mountains · Aspen, CO
BUTTERMILK MOUNTAIN 2026
A two-day festival at the base of Buttermilk Mountain in Aspen, blending massive house headliners with indie-pop and electronic acts, all against a panoramic Rockies backdrop. Presented by C3 Presents.
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16 artists announced plus a special orchestral performance · full lineup & set times at upintheskyfestival.com · subject to change
Festival Info · The Essentials
Up in the Sky is a two-day mountain festival at the base of Buttermilk in Aspen, presented by C3 Presents. It's a high-country venue with big views and thinner air, so here's the short version of what to expect.
Aspen sits at roughly 8,000 feet above sea level, and altitude sneaks up on flatlanders — pace yourself, drink way more water than you think you need, and take it easy on day one while your body adjusts.
This is a summary — check the official Up in the Sky site for full, current details.