rc, like keith said, any of our outside faucets have shut off valves inside the house, we shut them off, no problems.
we have a cast iron sewer pipe in the tuck under garage that does have a heat vent into the tuck under. we open that vent during winter months. the pipe is near the garage door. in years past when temps were like they are or have been, the darn thing would sometimes freeze up, cuz we shut that heat vent off, even though the pipe was well wrapped. what we did and what we learned was to keep that heat vent open during winter months and we re insulate that pipe and re wrap it as necessary. it is well wrapped and insulated, no heat tape, but as long as we maintain that and keep the heat vent open, we haven't had a problem since.
the worst water problem we ever had was; we have a well room in the lower level of the house (walk up rambler; main room when you come into the house) and the city service water line/meter comes into the house into that well room. one september, the city replaced the meter. i came home from work 1 day after the replacement of the meter to open the door and wade through 3 inches of water. what a mess. what a massive headache.
the city paid for the damage.