I put out grape jelly at the first sighting. I have a pair that come back every year (I think they're the same ones) and have a family. I watch them feed their babies the grape jelly until they start to turn colors and then they have to eat on their own. As soon as the youngsters are full color, they leave.
I've been waiting, but I think it's still too cold here. Lots of goldfinches, though.