I spot hawks all the time, daily, but I think it is only because I have trained my eyes to the shape of them. My ears, to the sound of them. Listen for the high-pitched cry, or for crows, with their endless mobbing. Seek the silhouette on the lone high branch; watch for enormous flapping wings of tan, and you will see what I see:
This red-tailed hawk (Buteo jamaicensis) was spotted over a parking lot one day when I went to Bed, Bath & Beyond. I heard the familiar harassing caw of crows, looked, and there she was.
This next spotting was on my own street, this afternoon. She flew directly in front of my car, squirrel dangling from talons (sweet!) and landed on a low branch. I snuck up on her with my car and took these from the window; if I had gotten out, I'm sure she would have flown. They don't like being watched.
Isn't it amazing what you can see when you know how to look?