Hummingbirds usually return to our yard about May 1st. I put up feeders last weekend, but haven't seen any customers yet. Hummingbird food recipe: 1 part sugar, 4 parts water. No need to add coloring, or boil. Just stir to dissolve the sugar. I refresh the feeders once a week early in the season and about every 2-3 days when it gets hot.