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 [email protected].

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!