Freeze damage to yer Mopar?

Hello, everyone! It don't get cold where I'm at. At all, really. But Tonight, in Tampa Bay, it's gonna be in below Freezing and in the 20s for 7 to 8 hours... should I be worried about my Rides? I don't know if that constitutes a hard freeze or the time is long enough for me to start flipping...
Only thing to be concerned about is the coolant if you've been running straight water. Forgot about that once on a straight six Nova. Got away with it too. It was one cold ride home but didn't nothing broke - sometimes you get lucky.