For long-term protection, take the time to wrap pipes with insulation. Foam pipe insulation costs less than 50 cents per foot at a home center. Focus on exposed pipes located in unheated spaces (such as a garage or crawl space) and on exterior walls. Close interior shut-off valves leading to outdoor spigots before draining spigots and installing faucet insulators.
Keep your garage door closed as much as possible, and open cabinet doors in your kitchen and bathrooms to allow warm air to reach plumbing. Keep your thermostat set at a constant temperature day and night, and let cold water drip from faucets served by exposed pipes to prevent freezing and pipe rupture.