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Monster Mash 5K


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October 30, 2021 - 9 AM

Lake Sammamish State Park Boat Launch/East Lake Sammamish Trail

Help us raise a monstrous amount of support for local students by joining us Saturday, October 30th, for the Issaquah Schools Foundation Monster Mash 5K!  Hosted at Lake Sammamish State Park Boat Launch and the East Lake Sammamish Trail, this first-ever, professionally chip-timed 5K route is perfect for soaking up the fall colors and fresh air!

Stretch and warm up beside gorgeous Lake Sammamish before you blast off from the back row of the parking lot onto the fast, flat, paved East Lake Sammmamish Trail.  (See route preview)  Event parking is conveniently located immediately next to the Start/Finish line and free with your WA State Parks Discover Pass.  Reserved start waves are designed to welcome all activity levels, whether you're an elite runner looking to PR, a walker who doesn't care to be rushed, or somewhere in between. 

We aim to create a comfortable space and place for all to participate, so phased start-times, wave limits and masking requirements will be in place.  For those who feel more comfortable running closer to home or indoors, a virtual race option with the same race swag is also available.  Set a new training goal for yourself, beat the weekend sugar rush, or simply embrace the holiday spirit and reconnect friends outdoor while helping to raise funds for local students.   

Costumes and festive holiday wear are strongly encouraged!

Those who choose to dress to impress will be entered into a raffle for gift cards to local restaurants and stores

In-Person 5K or Virtual Race Option Available

Each registration comes with a technical wicking T-shirt & unique medal*

Best Sold Out GIFs | Gfycat


*Due to pandemic-related delays & issues, t-shirts/medals for registrations after 10/10/21 will arrive in mid-November.  Paid shipping or pick-up at the Foundation to apply to late registration orders. 

PLEASE NOTE: Due to King County Covid-19 restrictions, Monster Mash 5K is a PARTICIPANT-ONLY event. We apologize for the inconvenience, but we are unable to welcome un-registered spectators at this time.  All who arrive to MM5K must be able to show proof of registration.  Please refer to the FAQ page for more details.












Aimee Holy - Compass Real Estate

Hilton Garden Inn - Issaquah

Issaquah Highlands

Jennifer McGeary, Penrith Home Loans - NWMLS #106496

Plateau Runner



Sponsorship Opportunites
100% of all proceeds go to support local students via the Issaquah Schools Foundation.


Additional awards for:

Overall 1st, 2nd, and 3rd Place (Male/Female categories)

Age category winners for:
Under 10, 10-14, 15-19, 20-29, 30-39, 40-49, 50-59, 60-69, 70+  

Early Packet Pick-Up Available 10/29/21 at Plateau Runner, 2-6 PM


Start/Finish Line/Registration/Packet Pick-Up/Onsite Parking:

West Lake Sammamish State Park Boat Launch

4455 E Lake Sammamish Pkwy SE, Issaquah, WA 98029


5K Route:

East Lake Sammamish Trail (Click on image for preview)




Monster Mash 5K is coordinated in partnership with Challenge Northwest



As a community-powered non-profit organization, we value and welcome your involvement. Your donation of time and talent will directly impact the quality of education our students receive.

Fueling Success for Every Student, Every School