Outdoor faucet handle / no water

I tried turning on my outdoor water faucet for the first time this year. The faucet handle can turn freely in either direction without stopping at all. It seems loose, like it's not turning anything. No water comes out. It has worked fine every year until now. I made sure the handle screw was tight. I even took off the handle and the metal part can just turn freely either way. We had an unusually hard freeze and snow this winter. Any ideas?