Boats made of milk cartons that float? With people aboard! Aye, aye! It’s the 42nd annual Seafair Milk Carton Derby at Green Lake. Still thinking about entering a boat? Registration is open until 11:59pm on July 12!

The 42nd Annual Denny’s Seafair Milk Carton Derby will take place on Saturday, July 14 from 10:00am – 4:00pm. Nearly 100 colorful milk carton boats of all shapes and designs will compete on the waters of Green Lake for $10,000 in prizes. The Derby is highlighted by a full day of “competition” as children, adults, families and businesses build milk carton watercraft for show and racing.

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Schedule for Saturday, July 14:
8:30 a.m. – Registration and Inspection Opens
10:00 a.m. – Open Category
10:45 a.m. – Racing Category
11:00 a.m. – UNFI Charity Challenge Build Begins
11:15 a.m. – Group/Commercial Category
11:45 a.m. – UNFI Charity Challenge
Noon – Kid’s Area Programming and Mooing Contest and Hula Hoop Contest
12:30 p.m. – Parade of Boats for Showboat Award Judging (non-racing)
12:30 p.m. – Seafair Team Challenge Boat Build begins
1:00 p.m. – Military Category
1:15 p.m. – Seafair Team Challenge Race
1:45 p.m. – Racing & Open Category FINALS
3:00 p.m. – Awards Ceremony at the Denny’s Stage

Click HERE to register!

Boat Categories
The racing, military and open categories are complimentary, there is no charge to enter.

Racing – Free to Enter
Any craft whose design and intent is primarily speed like skulls, kayaks, surfboards and racing type catamarans will be placed in this category. This race has two sub-categories:
Youth ages 8-13
Adult ages 14 and up

Military – Free to Enter
A special category for our military community, at least one crew member of the milk carton craft must be active duty military.
-A trophy for one year display will be awarded to the military race winner.
-A prize will be awarded to the military race entry judged to have the best design.

Open – Free to Enter
Any style entry other that racing, military or commercial. This category is for entries where design took precedence over speed in the construction. It is still however a race to the finish. This race has three sub categories:
Youth ages 8-13
Adult ages 14 and up
Family – kids up to age 13 with at least one adult

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Groups & Commercial – $250 Entry Fee
This category is for groups & Commercial entries. A $250 entry gives your group or company the opportunity to race with a company name, logo or slogan on your vessel. Take the challenge and race to glory on the formidable waters of Seattle’s Green Lake. A minimum of 100 half-gallon cartons or their equivalent is required. This category is not eligible for Showboat or other major price drawings. Entries must meet the conditions of the Open category. Each group/commercial participant will receive an official Milk Carton Derby T-shirt.

-Overall winner will be awarded 8 one-day passes to Seafair Weekend (Albert Lee Cup/Boeing Air Show) as well as 10% of collected entry monies donated to the non-profit of their choice.

-Best design in this category wins 4 one-day passes to Seafair Weekend (Albert Lee Cup/ Boeing Air Show).

NOTE: The racing category is for entries designed for speed. The open category is for entries where design and creative use of milk cartons is the primary purpose but this is still a race. The showboat award is not opened to sponsored groups/commercial or military entrants.

Need milk cartons? Seafair thanks Smith Brothers Farms for donating cartons! If you’d like to start building your derby boat, cartons will be available for pick up at the Seafair office. Please email Andrew Scott to schedule an appt. Milk cartons are provided at no cost and while supplies last.

There will be plenty of activities on shore as well – including interactive displays and exhibits, autographs and picture opportunities (Seafair Clowns, Seafair Princesses, The SeaGals – and more!) and plenty of food booths! Exhibitors will include: Denny’s, Albert Lee Appliance, Talking Rain Beverage Company, Whole Foods Market and UNFI! Some of the family-fun activities will include an Albert Lee Hydroplane Build and Tow, as well as a hula-hoop and moo-ing contest!

Green Lake is located at:
5900 West Green Lake Way North
Seattle, WA 98103

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For more information on Seafair, visit