What could I plant that would give me color by May 1 in Zone 6?

We live on a dead end country farm lane. Our only neighbor on the lane is hosting an outdoor family wedding on May 6. Guests on the way to the wedding will have to pass by our small barn. I would like to make that area along the lane pretty and have some color there. Any suggestions? The area is somewhat shaded by mature trees across the lane.
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