Can Spring be far behind?

I have heard that bald eagles nest very early. This is the first time I checked their nest in several weeks and they are both hanging around it now. Not sure if they are sitting on eggs yet, but they seem to be moving in that direction. Can Spring be far behind? And it is barely above zero this morning so imagine how they have to work to keep the eggs warm. Anyway, it is a good sign that winter may be losing its grip!