Without a picture, it is hard to be 100% certain, but I can tell you that this has been a really good winter for Rough-legged Hawks. These northern invaders have been fairly scarce in our parts the past few winters, but the low grass conditions due to our drought seem to really favor their hunting preferences. Like Red-tails they vary in color quite a bit but the best features to key in on are the dark “wrist” marks on the underside of the wing, the very dark lower belly band and the wide black tail band near the tip.