Mile High Festival 2024 Dates. The mile high 420 festival, is free and open to guests 21 and older. The entire downtown shuts down for the festival,.

As the first state to legalize cannabis, colorado has a unique history with the marijuana movement. The annual mile high beer festival will feature the very best brews colorado has to offer, with 40+ vendors and over 100 beers, ciders, spirits, and more to sample.