Redmond, WA | Sunday, June 7, 2026Registration Open
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!
Available Distances
Awards & Prizes
Participant Giveaway
10K: Participant Shirt
5K: Participant Shirt
1K: Participant Shirt
Registration & Pricing
Distance
Price
Opens
Closes
10K
$33.00
Feb 18
Apr 4
$38.00
Apr 4
May 2
$43.00
May 2
Jun 6
$50.00
Jun 6
Jun 7
5K
$28.00
Feb 18
Apr 4
$33.00
Apr 4
May 2
$38.00
May 2
Past Results
10K
Year
Finishers
Median Time
Fastest Time
2025
85
1:03:58
37:21
2024
117
59:22
37:09
5K
Year
Finishers
Median Time
Fastest Time
2025
514
37:43
18:17
2024
389
34:59
16:29
Unknown
Year
Finishers
Interested in this race?
Jun 6
$45.00
Jun 6
Jun 7
1K
$15.00
Feb 18
Jun 6
$20.00
Jun 6
Jun 7
EVENT SCHEDULE
REGISTRATION INCREASE DATES
10K Run/Walk Reg Prices: $33 - through April 3 $38 - April 4 through May 3 $43 - May 4 through June 5 $50 - June 6 & June 7 (race weekend) 5K Run/Walk Reg Prices: $28 - through April 3 $33 - April 4 through May 1 $38 - May 2 through June 5 $45 - June 6 & June 7 (race weekend) Youth Dash 1K Run Reg Prices: $15 - Through June 6 $20 - June 7 & 8 (race weekend) Kids participating in the youth dash may also walk/run the 5K with their parents at no additional cost and there is no need to r
