Events
In-Person 5K
Join us October 25th for the return of Monster Mash 5K!
Help us raise a MONSTROUS amount of support for local students on October 25th! ISF Monster Mash 5K is a community-based, family-friendly event that raises funds for programs that serve students attending all 27 ISD schools.
We welcome all-ages and abilities. Convenient onsite parking, phased start times, and a professionally chip-timed course ensure a great experience for all. You’ll appreciate the flat, paved, out-and-back route whether you’re setting a new 5K PR or enjoying a brisk walk together as a family! Bring your creativity – festive costumes are encouraged!
This event sells out every year, so don't wait to register! Every registration submitted by October 12th receives a 2025 Monster Mash technical race tee & medal. Registrants receive free event photos and raffle tickets for prizes as well! Placement awards for fastest finishing times will also be presented. See below for details.
* SAVE TIME - PICK UP YOUR PACKET EARLY FRIDAY, 10/24 - 4-7 PM! *
Avoid the lines on race day by picking up your packet early!
To avoid elementary school bus traffic in the area, Early Packet Pickup is available on Friday, Oct. 24th any time between 4-7 pm at the Issaquah Schools Foundation located at 4225 West Lake Sammamish Pkwy SE, 98008. Parking in front of the building is limited, so please view the additional overflow parking next door at Sunset Elementary (circled yellow areas). OK to pick up extra packets for friends and family - no ID required.
*Packets include: timing bib, medal, tee (if you registered by 10/12) and sponsor material. See parking lot map HERE.
Parking
Due to the number of registered racers, we strongly encourage that you arrive early and/or carpool if possible. If you need to pick up your packet the morning of the race, please allow for extra time for this, in the event there are lines.
There is parking available adjacent to the Start/Finish line at Lake Sammamish Boat Launch, which is a WA State parks. These parks require a Discover Pass for onsite parking. If you do not already have a Discover Pass, you may purchase a day pass for $10 at an onsite kiosk. Alternatively, you may purchase a Discover Pass at local stores such as REI and Fred Meyer. Please refer to the WA State parks for details and pricing (note that $30 Annual passes increase in price to $45 on October 1, 2025). Free overflow parking is available at the ISD Admin building parking lot, located .8 mile from the Lake Sammamish Boat Launch. If you choose this option, please allow adequate time to walk to the start of the race - Monster Mash 5K starts promptly at 10 AM.
Awards & Raffle Prizes
Placement awards will be presented for the following categories:
Fastest Male/Female Overall: 1st, 2nd, and 3rd Place
Fastest Male/Female by Age Category:
-
- Under 10
- 10-14
- 15-29
- 30-39
- 40-49
- 50-59
- 60+
Raffle Prizes: Must be present to claim.
* Please note that the timing for the awards and raffle prize portion of Monster Mash 5K is dependent on individual finish times (by age category). We also want individuals to have the opportunity to be present to claim raffle prizes. Generally speaking, however, we start this portion of the race before 11 AM - thank you for your patience!
View the MM5K FAQ's here.
Swag |
Contact Form
If you have any questions about this race, click the button below.
Event Location
Lake Sammamish Boat Launch
4455 E Lake Sammamish Pkwy SE
Issaquah, WA 98029 US
View Location on Map
