Big Backyard 5K/10K

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 9 at King County's Marymoor Park to have fun in YOUR BIG BACKYARD!

Sunday, June 9 | Marymoor Park | Redmond, WA

7:30AM - 9:00AM -  Packet Pickup Opens at Marymoor Park Event Pad

8:30AM - 1K Kids Run Start

9:00AM - 5K & 10K Run/Walk Start

10:00AM - Overall Awards Ceremony for top 3 finishers (male & female)

12:00PM - 2024 Event Concludes!

Keep your Big Backyard celebration going by visiting one of our event partners for some post run food & beverages!

10K Run/Walk Reg Prices:

• $30 - through April 5
• $35 - April 6 through May 3
• $40 - May 4 through June 7
• $45 - June 8 & June 9 (race weekend)

5K Run/Walk Reg Prices:

• $25 - through April 5
• $30 - April 6 through May 3
• $35 - May 4 through June 7
• $40 - June 8 & June 9 (race weekend)

Youth Dash 1K Run Reg Prices:

• $15 - Through June 7
• $20 - June 8 & 9 (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 register for anything additional

All participants joining us for the Big Backyard 5K will receive the following as part of the event registration:

• Short Sleeve Participant Shirt
• Big Backyard Finisher Medal
• Custom Race Bib & Timing Chip

PRE-RACE PACKET PICKUP

Currently we are not offering a pre-race packet pickup. Packet pickup, as of now, will only be available on race day near the start line at Recreation and Event Area.

RACE DAY REGISTRATION & PACKET PICKUP

Race Day packet pickup will open starting at 7:30am and will continue to stay open until the start of all races (8:30am for youth dash and 9:00am for all other races). Haven't registered yet? You can do that via your phone right on the race website up until the start of the races as well. After registering, jump in a packet pickup line. By the time you arrive at the front, your packet and swag will be ready for you!

10K & 5K COURSES

The 10K and 5K courses will start at the Marymoor Park Recreation and Event Area near the velodrome and climbing wall. All participants are welcome to run or walk the courses. After leaving the recreation and event center, all participants will run west along the Marymoor Connector Trail to the Sammamish River Trail. From there, they'll cross over the Leary Way bridge and continue north along the Sammamish River Trail before turning around. From there, all participants will follow the same pathways back to the Marymoor Pad. 

5K participants will turn north to the finish line while 10K participants will continue east on the Marymoor Connector Trail running the full distance of the park. Upon exiting the park, 10K participants will do an out and back south then north along the East Lake Sammamish Trail before returning back to Marymoor Park. Running west for the final stretch, participants will follow the connector trail back to the finish line!

There will be two water stations on course, one shared by both races at the 2 mile mark and the other, for only the 10L at the mile 4 mark at the east edge of the trail. Both stations will have water only.

YOUTH DASH - 1K KIDS COURSE

The youth dash will start and finish at the Recreation and Event Area near the velodrome and climbing wall. The course will consist of a short out & back along the Marymoor Connector trail. Parents are welcome to run with their kids and do not need to register to do so. A map of the kids course will be available soon.

Click the icon below to download the attached PDF.

When is the Big Backyard 5K? - The BBY 5K will take place June 9, 2024

Where is the Big Backyard 5K? - The event will take place at Marymoor Park Recreation and Event Area, near the velodrome

What time does the event start? - The Youth Dash will take place at 8:30am. The 10K & 5K events will start at 9:00am

Can I Walk? - YES! All participants are welcome to run or walk the event and courses will remain open until all participants have finished the event.

Can my dog join? - Of Course! Please just make sure when others are passing that you keep your furry friend to the outside of the trail to ensure we don't trip any participants.

Can I push a stroller? Definitely! Strollers are 100% welcome as this is a very family oriented event. Please just ensure the safety of others by keeping the strollers to the side of the train.

Are the roads closed? - Actually - the event will take place 100% on paved walking/biking paths so you will be protected from vehicular traffic at all times.

Are there awards? - All participants will receive downloadable finisher certificates that also showcases their placement in their specific age group categories. We do not have other awards though other than your downloadable awards.

If I cannot participate, what are my options? - Unfortunately we do not offer refunds, but we are happy to defer your entry to the next year OR you may transfer your entry to another participant (friend or family typically) that does want to participate, free of charges for transfers.

• 2023 RESULTS

• 2022 RESULTS

• 2021 RESULTS

• 2020 RESULTS (Virtual Results Only)

• 2019 RESULTS

• 2018 RESULTS

• 2017 RESULTS

• 2016 RESULTS

• 2015 RESULTS

• 2014 RESULTS