Raisins are popular with a wide variety of backyard birds. However, most of the Georgians that feed birds that I have talked to tell me they only offer raisins to their backyard birds in the winter. This is unfortunate because these juicy sweet dried grapes are a great source of food for the birds that occupy our backyards during the summer too. When you stop and think about, raisins are a great source of vitamins, sugar, fiber, vitamins and minerals.
The noted nature writer John K. Terres wrote in is his book Songbirds in Your Garden that raisins were among the best fruit offerings for birds in the summer.

NORTHERN-MOCKINGBIRD//Photo credit: Terry W. Johnson