Denver–Boulder Halloween Runs 2026 — Costume 5Ks & Spooky Races

Costumes at the start line, candy at the finish: Denver–Boulder has 12 Halloween-season races on the 2026 calendar, from pumpkin runs to full costume-contest 5Ks. Most award prizes for the best outfit — check each listing's organizer page for contest rules. The next one up is Spooky Sprint - Denver on Sat, Oct 3, 2026. Every listing links straight to registration.

• Sat, Oct 3, 2026 Spooky Sprint - Denver Chatfield State Park · Littleton, CO · From $20 5K10KHalf Marathon Road
• Sat, Oct 24, 2026 Race to Cure Sarcoma Denver Berkeley Lake Park · Denver, CO · From $10 5K Road
• Sat, Oct 24, 2026 Apex Foundation Trick or Trot 5K & Halloween Hunt Powered by REP Fitness 13150 W 72nd Avenue · Arvada, CO · From $10 5K Road
• Sat, Oct 24, 2026 YMCA Creepy Crawl 5K presented by Corwin Honda Santa Fe Trailhead · Palmer Lake, CO · From $40 5K Road
• Sun, Oct 25, 2026 Ghosts and Goblins 5K/10K City Park · Denver, CO · From $30 5K10K Road
• Sun, Oct 25, 2026 The 14th Annual Odyssey Odyssey - 2026 101 Yosemite Street (Great Lawn Park) · Denver, CO 5K Road
• Sat, Oct 31, 2026 Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Oct 31, 2026 PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
• Sat, Oct 31, 2026 I Ain't Scared (of 5k) Colorado and 108th Ave · Thornton, CO · From $29 5K Road
• Sat, Oct 31, 2026 Halloween Fun Run 5k & 1mile - Zombie Theme 320 Chicago Creek Rd · Idaho Springs, CO · From $20 5K Road
• Sun, Nov 1, 2026 All-Out Kooky-Spooky 19500 W 64th Pkwy · Golden, CO · From $35 5K10KHalf Marathon Road
• Sat, Nov 21, 2026 Pumpkin Pie 5K/10K City Park · Denver, CO · From $30 5K10K Road

Race-day tip

Test-run your costume BEFORE race morning. Capes tangle, masks fog, and inflatable dinosaurs add about two minutes per mile.

Looking beyond halloween? See every upcoming Denver–Boulder race →