Seattle Halloween Runs 2026 — Costume 5Ks & Spooky Races

Costumes at the start line, candy at the finish: Seattle has 19 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 Haunted 5K, 10K, 13.1M & 26.2M at Everett, WA (40) on Sat, Oct 3, 2026. Every listing links straight to registration.

• Sat, Oct 3, 2026 Haunted 5K, 10K, 13.1M & 26.2M at Everett, WA (40) 400 Smith Island Rd · Everett, WA · From $30 5K10KHalf MarathonMarathon Road
• Sat, Oct 3, 2026 Monster Mad Dash 5K 23000 Lakeview Dr · Mountlake Terrace, WA · From $35 5K Road
• Sat, Oct 10, 2026 Haunted 5K, 10K, & 13.1M at Everett WA (41) 600 128th St SE · Everett, WA · From $30 5K10KHalf Marathon Road
• Sun, Oct 11, 2026 Pumpkin Spice Run 5902 Lake Washington Blvd South · Seattle, WA · From $12 5K10K Road
• Sat, Oct 17, 2026 Haunted 5K, 10K & 13.1M at Everett, WA (42) 3505 Lowell Snohomish River Rd, · Everett, WA · From $30 5K10KHalf Marathon Road
• Sun, Oct 18, 2026 Running Scared 5K/13K - Seattle Green Lake Park · Seattle, WA · From $30 5K Road
• Sat, Oct 24, 2026 2026 Greenlake 5K and Wellness Festival 7201 East Green Lake Dr N · Seattle, WA · From $35 5K Road
• Sat, Oct 24, 2026 West Seattle Monster Dash 2026 8611 Fauntleroy Way Southwest · Seattle, WA · From $20 5K Road
• Sat, Oct 24, 2026 Issaquah Schools Foundation Monster Mash 5K 4455 E Lake Sammamish Pkwy SE · Issaquah, WA · From $35 5K Road
• Sun, Oct 25, 2026 Snoqualmie Valley Harvest Run 39903 SE Park ST · Snoqualmie, WA · From $5 5K10K Road
• Sun, Oct 25, 2026 Run Scared 5895 Lake Washington Blvd S · Seattle, WA · From $25 5K10K Road
• Sun, Oct 25, 2026 Captain Jack's Treasure Run 15670 NE 85th St · Redmond, WA · From $10 5K Road
• Thu, Oct 29, 2026 Ten Trails Active Club Trot n' Treat Relay Scramble 23089 SE Fir St · Black Diamond, WA Trail Run Trail
• Sat, Oct 31, 2026 Halloween Trick or Trot Run 5K/10K/13.1 SEATTLE 8498 Seaview Pl NW (Course Maps emailed) · Seattle, WA · From $30 5K10KHalf Marathon Road
• Sat, Oct 31, 2026 PB&J Fuel Run 5K/10K/13.1 SEATTLE 8498 Seaview Pl NW (Course Maps emailed) · Seattle, WA · From $30 5K10KHalf Marathon Road
• Sat, Oct 31, 2026 Cougar Mountain Trail Run Series (October) Sky Country Trailhead · Bellevue, WA · From $40 5KTrail Run Trail
• Sat, Oct 31, 2026 Haunted Hustle 5K & 10K 1710 12th Ave SW · Puyallup, WA · From $30 5K10K Road
• Sat, Oct 31, 2026 Wicked Fast 5K & 10K Dune Peninsula Park · Tacoma, WA · From $15 5K10K Road
• Sat, Oct 31, 2026 Trick or Treat 5k 5900 Lake Washington Blvd S · Seattle, WA · From $33 5K 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 Seattle race →