🎃 4th Annual Monster Mash 5K & Creature Crawl 1K 👾
Join the Mid-Columbia Children's Museum for the 4th Annual Monster Mash 5K & Creature Crawl 1K, a family-friendly Halloween event bringing together costumes, movement, and hands-on fun in support of the future Mid-Columbia Children's Museum.
Whether you're running the 5K, walking with friends, or cheering on your little monster in the Creature Crawl, there's something for everyone!
📅 Saturday, October 24, 2026
📍 Howard Amon Park | Richland, WA
What to Expect
🏃 Costume-friendly 5K run/walk
👾 Creature Crawl 1K for kids and families
🔬 STEM-inspired activities
🍂 Family-friendly fall fun
❤️ Support the future Mid-Columbia Children's Museum
🎟️ Registration
Registration opens at 9:00 AM on September 1, 2026!
Register early and join us for one of our favorite family events of the year. Early registration ends October 1st!
💙 Foster & Kinship Families
Discounted registration is available for foster and kinship families. To receive a special registration code, please reach out to us at info@mccmuseum.org.
We want Monster Mash to be an event all families in our community can enjoy! 🎃👾
Race Day Rules
🎃 Costumes encouraged — keep them safe to run or walk in!
👶 Strollers welcome — please start toward the back.
🐾 Please leave pets at home (service animals welcome).
👾 Keep little monsters supervised.
➡️ Stay on the marked course and follow volunteer directions.
❤️ Be kind, have fun, and cheer each other on!
Additional race-day details, including check-in and start times, will be shared closer to the event.
We can't wait to celebrate another year of community, creativity, curiosity, and fun with you!
Oct 24, 2026
Distance — 5K
Type — Running
09:30
$20.00
Oct 24, 2026
Distance — 5K
Type — Running
09:30
$10.00
Oct 24, 2026
Distance — 1K
Type — Running
10:30
$1.00
Oct 24, 2026
Distance — 1K
Type — Running
10:30
$10.00
These values represent the 3-year monthly averages for October in Richland.
Learn more about the host city, Richland.
Richland is a city in Benton County, Washington, United States. It is located in southeastern Washington at the confluence of the Yakima and the Columbia Rivers. As of the 2020 census, the city's population was 60,560. Along with the nearby cities of Pasco and Kennewick, Richland forms the Tri-Cities metropolitan area.
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