As the oldest county fair in Colorado, the Boulder County Fair is still going strong more than 150 years after its original inception and remains a local, family-oriented event, celebrating our state’s agricultural heritage and showcasing the outstanding work of our 4-H and FFA youth. The Boulder County Fair also remains one of only four non-profit county fairs in the state of Colorado and regularly draws more than 100,000 attendees.
Community Gathering
Boulder County Fair
Dates: August 5, 2026 - August 9, 2026
In Person
Boulder County Fairgrounds
9595 Nelson Rd #200
Longmont, Colorado 80501