I've parked my car in the middle of winter for three weeks and did not have a problem. First, park the card facing south in the middle of the lot. Most cold blasts come from the northwest and can blow snow into the engine. Also, the sun arcs across the southern sky. Second, charge up a self charger that can be used to jump the car if the battery dies and leave it in the trunk. Third, inflate the tires to 38 psi in the winter to keep them from losing much air due to extreme cold weather. A final note. Let the car warm up a few minutes to get all the oil and fluids warm before driving. Have a worry free trip.