Winter is for the birds!
Now's the time to get your bird-feeders well stocked. Birds that are normally migratory will stick around if they know there is a consistent food source. Generally, it's best to avoid seed mixes from your grocery store. Most birds have specific seed preferences and will kick out the stuff they don't like. Instead it's best to buy individual seeds that your feathered friends will like.
According to the Spokane Audubon Society, if you are located in an urban area where House Sparrows are prevalent, it's not recommend to use a seed mix especially on a platform. House Sparrows are so very aggressive that other birds will not be able to enjoy your food and they will only pick out what they like. So instead opt for Black Oil Sunflower seeds. These are enjoyed by most birds in our area (including House Sparrows) and because they like them, you will see less wasted food on the ground.
In rural areas, you can experiment with seed mixes as well as just Black Oil Sunflower seeds. You will likely see California Quail, Mourning Dove, finches, chickadees, nuthatches, juncos, White-crowned Sparrows, blackbirds and others. And who knows you might get lucky and see a rarity like the Band-tailed Pigeon.