While it is an hour north of Seattle, and therefore not in Seattle proper, the annual Skagit Valley Tulip Festival in April is an impressive and colorful display, and comes with a wide variety of auxiliary events, such as arts festivals.
As the event is quite far north of Seattle (about halfway to Canada) I have actually put the bulk of the information about this event in a city closer to the actual event location.
However, I have put this pointer here in the Seattle section because there are a large number of people who come to the Seattle tips section looking for information on the tulip farms and associated events.
See my Skagit Valley Tulip Festival Tip
for more information, or see the festival web site listed below for specific event information such as the exact dates that are set.
For the 2010 festival, a $4 pass gets you into multiple farm visits, but does not include admission to the display gardens. There are several display gardens that are small tourist attractions in their own right, and are decorated by professionals for viewing. Those are an extra admissions charge.
Even if the big festival isn't going on, if you visit in April it might be worth a trip up to the Skagit Valley to see what display gardens and other locations are open to the public outside the true festival, using the Tulip Festival Map on the web site as a guide. However, some places will be closed to the public.
While the weather has not been the most kind in the Pacific Northwest, this actually creates unlikely views of the tulips. Check it out here - http://bit.ly/ey9OHV
Not as many Tulips as the previous years, but can still enjoy a view that most people will not get to see ever.
Just got back from a trip to the Pacific Northwest. I was shocked to find some tulip fields north of Seattle. I made a video of these beautiful tulips. You will be awe struck at the beauty of the tulip fields of Skagit Valley in Washington State. Enjoy the beauty of the "Keukenhof" Tulip show in Holland that inspired Mr. Roozen, a Dutch immigrant, to start a tulip farm in Washington.
Watch my video on youtube - http://www.youtube.com/watch?v=1zENhjKD3Rk
On April, it is possible to visit lovely tulip gardens around seattle.....I can't think of anybody who wouldn't love that......Just remember that the tulip fields are muddy. It would be smart to bring rubber boots if you have any.