Get early access
5 family Halloween events near Denver / Boulder with 2026 dates confirmed on their official sites, across 4 towns. The earliest to open is Boo at the Zoo, on October 2. 3 list free admission.
After-dark trick-or-treating around the zoo grounds with candy stations, costumed cryptid characters and animal ambassadors.
Free trick-or-treating at participating Olde Town Arvada businesses the evening before Halloween, with a costume contest in the town square.
Long-running community costume parade down Main Street in Longmont, followed by trick-or-treating at downtown businesses.
Boulder's Halloween afternoon tradition: kids in costume trick-or-treat along Pearl Street at participating downtown shops and restaurants.
One-day harvest celebration at Denver's oldest standing house and farm site along Cherry Creek, with pumpkins and old-time family activities.
Boo at the Zoo, Longmont Halloween Parade, Munchkin Masquerade, Pumpkin Harvest Festival and Trick or Treat Street. Each has its 2026 dates, hours and prices on its own page.
The earliest in this guide is Boo at the Zoo on October 2, 2026.
Boo at the Zoo, Longmont Halloween Parade, Munchkin Masquerade, Pumpkin Harvest Festival and Trick or Treat Street are rated 1 of 5 ghosts: not scary.
Yes: Longmont Halloween Parade, Munchkin Masquerade and Trick or Treat Street list free admission on the official site.
All Denver / Boulder Halloween eventsPumpkin Patches & Corn Mazes near Denver / BoulderHalloween for Kids near Denver / BoulderDenver / Boulder trick-or-treat timesFamily Halloween Events in every city