Abstract: Garage Door Track Lock to prevent overhead opening garage door from opening. Lock with Z Flange is placed securely through garage door vertical track on one side with back plate and shackle inserted through lock cylinder on opposing side and is securely in place above roller. When the lock secured in this way it prevents garage door opening. Lock cannot be cut with bolt cutters or pried off. Garage Door will be able to open when lock is unlocked with a key. The lock uses a Z Flange welded on Master Lock M46XKAD (or equivalent) and a round back plate is welded to the Master Lock shackle.