In the past, Suet has been a winter-only bird food. In the not so distant past, suet was subject to spoilage in warmer temperatures so it could only be used effectively in the winter months. Nowadays, the ready-made suet cakes are less likely to spoil and can be used all year around. They are made to fit in a suet feeder such as this Suet Haven Feeder.
Suet makes a good year round feed because it will attract birds that typically do not visit a bird feeder stocked with seed-based bird food. Examples of birds you can add to your visitor list with a suet feeder are woodpeckers, kinglets, wrens, and warblers.
In the winter, suet provides a high energy feed for just about all your backyard birds. This is the time of year where they will need that the most. Ready-made suet cakes come in many styles and 'flavors' and they are seldom very expensive. Be sure to experiment with the different varieties and note the results. Your birds will love visiting your yard with the right suet feed in your suet feeder.