Daffodil field in the Skagit Valley, around Mount Vernon, Washington. Note the gray skies-it was raining, and we found many flooded fields. The Tulip Festival runs through April, and if Sunday was any indication, the tulips will be late this year. The Skagit Valley has some of the most fertile soil in our state, and is the second-largest supplier of flower bulbs in the world, after Holland.