The Skagit Valley Tulip Festival was first an event in 1984. The first few years the Festival ran only 3 days, then was increased to 10, then 17 days. As it was impossible to tell in advance when the tulips would be actually blooming, in 2006 the Festival time was increased to the entire month of April. This allowed a window of time to ensure that at some time during the Festival the Skagit Valley’s spectacular tulip show would be at it’s best.
From the Tulip Festival web site: “The Mission of the Skagit Valley Tulip Festival is to coordinate and promote a countywide Spring celebration of the tulip bloom, in commemoration of the valley’s annual tulip harvest, and to be an advocate for Skagit Valley agriculture.”
I am not going to attempt to describe what the Festival is like, your best bet is to go to their own web site for the latest information about the current festival. Skagit Valley Tulip Festival