Mercer Slough Environmental Education Center

Wild B’earthday Parties

Celebrate Your Birthday in the Wild!

Explore the wetlands, play ecology games and celebrate your party amidst the tree tops in our facility’s tree house. Wild B’earthday parties are available Saturdays and Sundays from mid-September through early June. Choose a theme below, then call (206) 443-2925 to book your child’s B’earthday Party today.

Party Themes


Animal Mania

Play various animal games, take home your own homemade animal track and hike through the trails of Mercer Slough in search of animal signs. Ages 5+

Bug Safari

Explore the world of insects with bug boxes and magnifying glasses, play ecology games and seek out tiny creatures as you hike through the Slough. Ages 5+

GPS Scavenger Hunt

Learn how compasses and GPS devices work. Then, follow the coordinates on a GPS scavenger hunt to find some of Mercer Slough’s hidden wonders. Ages 8+. Max. 15 kids.

Parties Include

  • 1.5 hour guided hike
  • Themed takeaway – a bug box, plaster animal track or compass clip
  • E-invitations
  • 1 hour use of a private party room decorated to match the party theme
  • Tablecloths, plates, cups, forks and napkins. Just bring the food and drinks!

Please note: We head out rain or shine, but can include some indoor activities if inclement weather clouds your birthday.



  • $215 for up to 20 guests, max. 15 children ($205 for Members)
  • $295 for up to 35 guests, max. 25 children ($285 for Members)


Mercer Slough Environmental Education Center