Big Backyard 5K/10K
Sun, Jun 7, 2026, 4:30 AM PDT
- Type
- Run
Sign up and verify details on the organizer's official page.
Race feel
Enjoy a fun run or family walk at Marymoor Park, supporting King County Parks and their vital work.
- Fun
- For a Cause
Fun
For a CauseThe Big Backyard 10K is an annual fun run and family walk in Redmond, WA, celebrating King County Parks. Since its inception in 2010, this event has brought together over 13,000 participants, raising more than $80,000 to support park maintenance and operations. Join fellow runners and walkers at Marymoor Park for a joyful experience that directly contributes to keeping local green spaces open and well-maintained year-round. It's a wonderful way to enjoy the outdoors while giving back to the community.
What to expect
- A fun run and family walk experience in Redmond, WA.
- The 10K course is on hilly terrain at a low altitude.
- Expect mild weather conditions typical for the season.
Standout details
From the organizer
The Big Backyard 5K & 10K is an annual fun run and family walk celebrating the numerous King County Parks throughout our neighborhoods, cities, and county.
Founded in 2010, proceeds from the BBY 5K benefit King County Parks, support maintenance within the parks and operations of the facilities and recreational resources to keep our parks operating and open year-round!
Since the event's inception in 2010, more than 13,000 participants have gathered to raise over $80,000 for King County Parks!
Join us at 9:00am on Sunday, June 7 at King County's Marymoor Park to have fun in YOUR BIG BACKYARD!
