Make sure that your garage is properly secured. Overhead doors should never, unnecessarily, be left open. The service door should be of solid core construction and equipped with a good deadbolt lock with a reenforcement plate. The strike plate for the lock should be mounted with screws at least 3 inches in length. Mount a light near your service door.
Lighting is the least expensive security and it is very effective.
Valuable items such as snowblowers, lawnmowers are being targeted. They should be secured in the garage by chaining them to the garage wall or floor. The chain should be heavy duty with a padlock of equal strength. Smaller motorized garden tools can be secured in a lockbox. Make sure you record the serial number and a description of the item, so if stolen and recovered, it can be returned to the owner.