YMCA Halloween Run - Boise - October 24, 2026

Choose a costume-friendly Monster Mile, Freaky 5K or half marathon, then stay for the Micron Trunk or Treat. Current official registration start times are half marathon 9 a.m., Monster Mile 9:45 a.m. and Freaky 5K 10 a.m. Mountain Time. The YMCA calendar lists an overall 10 a.m.-2 p.m. window; use the registration page for your race's earlier start and final instructions. Organizers recommend arriving at least 45 minutes before your race. Friday packet pickup is October 23, 3-7 p.m., at Bandanna Running and Walking, 504 W Main Street. Race-day pickup is at the start area, 8-9:30 a.m.

When: Saturday, October 24, 2026. Half marathon: 9 a.m.; Monster Mile: 9:45 a.m.; Freaky 5K: 10 a.m. Mountain Time.

Where: Ann Morrison Park, 1000 S Americana Boulevard, Boise, Idaho 83706.

Cost: As checked Oct14: Monster Mile $35; Freaky 5K $40; Half Marathon $70. Listed prices increase after Oct18; confirm fees at registration..

Plan your visit: Registration required for runners, including parents running alongside children.

Official event announcement | Registration and current details

Details reviewed October 14, 2026. Image: original AI-generated illustrative image for Idaho Family Fun; it does not show the actual event, attendees or venue.