MCCM Monster Mash 5k & Creature Crawl 1k

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!