The Skagit Valley Tulip Festival draws people from all over the world and is held from April 1-30.
Pro Tip: If you happen to be in western Washington during spring, the Tullip Festival is stunning and well worth checking out. With tons of local art and cute shops, the little seaside village of La Connor is another worthy addition to any road trip through this area. And if you have a few extra days, you can hop on one of the ferries from Anacortes to the San Juan Islands.