MonsterDash Run

Course

Starts and finishes at Louisville Community Park, 955 Bella Vista Drive. The 5K is a lollipop loop heading west on wide dirt trails, measuring 3.3 miles, with one water stop. The 10K is a figure-of-eight, west with the 5K then east on a dirt bike path toward Broomfield, with water at miles 1.2, 2.0, 4.5 and 5.0.

Key dates

• !
  Registration
  Open now
• ★
  Race day
  Sun 25 Oct 2026

About

The MonsterDash Run is known for its fun kids races, costume contest, and post-race festivities with food, drinks, and scary music. Over 60% of runners come in costume to this unique afternoon race.

• 

  Ghosts & Goblins 5K

  Sun 25 Oct · Denver, CO · 10K · 5K
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• 

  Narrowleaf Lake Run

  Sat 31 Oct · Loveland, CO · 15K · 10K · Heavy 5K · Kids Fun Run · Kids Fun Run · 1 Mile Pumpkin

  Flat, paved course along Boyd Lake with lake views

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• 

  November Trophy Series – 15Km and 5Km at Prairie Gateway Park

  Sun 1 Nov · Commerce City, CO · 15Km · 5Km

  Part of RMRR's season-long scoring series

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• 

  All-Out Kooky-Spooky

  Sun 1 Nov · Golden, CO · Half Marathon · 10K · 5K

  Along Ralston Creek Trail past Arvada's Blunn Reservoir

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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.