I Heart Pluto Festival (February (mid-month, around the 18th anniversary of Pluto's discovery; 2026 dates: Feb 12–16)). Annual multi-day festival organized by Lowell Observatory celebrating the 1930 discovery of Pluto. Includes public talks, Pluto Pub Crawl at downtown Flagstaff venues, and astronomy programming. 2026 marks the 7th…
Overland Expo West (May (annually, mid-May; 2026 dates: May 15–17)). Premier annual overlanding, adventure travel, and camping gear expo held at Fort Tuthill County Park. Features classes from leading outdoor experts, manufacturer exhibits, and vehicles. Draws tens of thousands of…
Flagstaff Festival of Science (Late September–early October (10 days; 2026 dates: Sept 25–Oct 4)). Founded in 1989/1990, this is the longest continuously running, entirely free science festival in the United States. Presents 90+ public activities including field trips, telescope nights, and keynote lectures at…
Pickin' in the Pines Bluegrass & Acoustic Music Festival (September (second weekend after Labor Day; 2026 dates: Sept 18–20)). Annual bluegrass and acoustic music festival presented by Flagstaff Friends of Traditional Music (501c3). Held at Pepsi Amphitheater, Fort Tuthill County Park. 2026 marks approximately the 20th annual edition.…
Flagstaff Star Party (October (early October; 2026 dates: Oct 1–3)). Annual free public stargazing event at Buffalo Park, presented by the Flagstaff Dark Skies Coalition. Features up to 30 telescopes operated by amateur and professional astronomers, twilight talks, and music. Celebrates…