Loading view. There were no results found. There were no results found. Boulder County Fairgrounds Events Venues Boulder County Fairgrounds 9595 Nelson Rd Longmont, CO 80501 Get Directions (303) 678-6235 www.bouldercounty.org/open-space/fairgrounds/ Events at this venue Today Upcoming Upcoming Select date. Previous Events Today Next Events Subscribe to calendar Google Calendar iCalendar Outlook 365 Outlook Live Export .ics file Export Outlook .ics file