Boulder County Halloween Trunk or Treat Tuesday, October 20th, 2026 from 4:00 PM to 6:00 PM Boulder County Sheriff's Office 5600 Flatiron Parkway (MAP) Join us for an afternoon of Halloween fun, candy, haunted hallways, and more! We can’t wait to see all our little ghosts, goblins, and superheroes. FREE event for kids 12 & under! Bring the family, wear ...