7 listed options in Longmont, with dates, costs, age guidance and direct organizer links. Choose a candy outing, costume event or seasonal plan that fits your group.
Coverage is curated, not exhaustive. Some listed dates may have passed; check each date before planning. Nearby towns are listed in their own city guides. Age restrictions and uncertain prices stay visible.
Community festival with decorated trunks, games and candy.
Location: Clark Centennial Park parking lot,1100 Lashley Street, Longmont, CO
Cost: Free; voluntary food/essentials donations welcome
Age guidance: Children and families
Costumed storytime followed by a community trick-or-treat route.
Location: Longmont Public Library,355 Emery Street, Longmont, CO
Cost: Free library program
Age guidance: All ages with caregivers
Organizer details for All Ages Halloween Storytime & Civic Center Treats
Costume parade followed by downtown business trick-or-treating.
Location: Roosevelt Park and Main St, Longmont, CO
Cost: Free admission; no registration
Age guidance: All ages
Organizer details for Halloween Parade & Trick-or-Treat Street
Weekend pumpkin carnival, farm activities and rides.
Location: 9059 Ute Hwy, Longmont, CO 80503
Cost: Free admission and parking; activity tickets and pumpkins extra
Age guidance: Family-friendly; numeric age limits not published
Cultural celebration with music, dance and crafts.
Location: 4th Ave and Kimbark St, Longmont, CO
Cost: Free admission; vendor purchases extra
Age guidance: Family-friendly; numeric age limits not published
An astrobiologist discusses monsters, mythology and science-fiction invasion stories.
Location: Longmont Museum, 400 Quail Road, Longmont, CO 80501
Cost: Free; reserve in advance
Age guidance: Adult library/museum program; numeric minimum not published
Organizer details for Monsters, Myths, and Alien Invasions — Dr. Graham Lau · Tickets or registration
A costume-optional murder-mystery dinner in the orchard with professional actors and a chili buffet.
Location: 6914 Ute Highway, Longmont, CO 80503
Cost: $120/person; dinner, entertainment and gratuity included. Optional donation bar extra.
Age guidance: 16+; adult-humored murder mystery, not a young-child activity