Oh the red, red robins

On any given morning, I get up, open the curtains on my back door to the porch and there are easily thirty or more robins sitting in the three trees behind my house waiting for breakfast. Did I miss something here? Aren’t robins supposed to be the first birds of spring? What the hell are they doing in the trees behind my house in Alaska, in the winter, with the temps hovering at 0 to 10 degrees F? And can I afford over $100 a week in bird food to keep them from creating an Alfred Hitchcock scene when I open the door to let the dogs out?