Winter in Ontario can be beautiful — but freezing temperatures bring a long list of problems for locks and doors. From frozen keyways to jammed commercial doors, a small lock issue can quickly turn into a frustrating (and expensive) emergency.
Whether you own a home or manage a storefront, preparing your locks for winter is one of the smartest moves you can make. Here’s a practical guide from Thornhill Locksmith to keep your locks working smoothly all season long.
The problem: Moisture seeps into the keyway and freezes overnight. The next morning, your key won’t go in, or worse — it snaps.
Where it happens most: Exterior residential deadbolts, storefront entry doors, padlocks on gates and sheds.
What to do:
Use a proper lock de-icer, not hot water (which can make the problem worse).
Apply a graphite-based lock lubricant before temperatures drop to prevent moisture buildup.
Keep a spare key indoors so you’re not stuck outside trying to thaw a frozen lock.
👉 Pro Tip: If the lock is frozen solid and the key feels stuck, don’t force it. A locksmith can defrost and service it without damaging the cylinder
The problem: Cold weather causes metal frames and hardware to contract, throwing off door alignment. Panic bars and closers may also stiffen in the cold, leading to security or emergency exit issues.
Where it happens most: Storefront glass and aluminum doors, warehouse bay doors, office building entrances.
What to do:
Have hinges and closers inspected and lubricated before the deep freeze.
Make sure panic bars snap back easily and meet fire code standards.
If doors aren’t closing properly, call a commercial locksmith before the issue worsens.
👉 Proper maintenance can save hundreds in emergency service calls during peak winter storms.
The problem: Cold weather thickens grease and makes parts stiff. Misalignment caused by door shrinkage can make locks hard to turn.
Where it happens most: Older residential wooden doors, rear service doors, and warehouse side exits.
What to do:
Remove dirt and apply graphite or silicone spray (never oil-based lubricants).
Check door alignment and weatherstripping to ensure the latch is hitting the strike plate cleanly.
Schedule a pre-winter tune-up with a locksmith to adjust and service locks before freezing temps hit.
The problem: Garage door locks and outdoor padlocks are exposed to the elements, making them prime targets for freezing and rust.
Where it happens most: Detached garages, loading docks, backyard gates.
What to do:
Replace any cheap or rusted padlocks with weather-resistant models.
For commercial roll-up doors, make sure the locking bars and cylinders are serviced annually.
Keep locks covered or use weather caps to keep snow and ice out.
Sometimes, prevention isn’t enough — upgrading is smarter. Consider:
Weatherproof locks for exterior gates and storage units.
Smart locks with keypad access to avoid keyway freezing.
High-quality Canadian brands like Medeco, Weiser, Schlage, and Mul-T-Lock which offer better sealing and build quality for harsh weather.
✅ Lubricate all exterior locks in late fall
✅ Check alignment of doors and frames
✅ Service commercial panic bars and closers
✅ Replace damaged weatherstripping
✅ Store spare keys securely indoors
✅ Keep a locksmith’s number handy for emergencies
Don’t wait until your key snaps in the door on a freezing morning. At Thornhill Locksmith, we offer residential and commercial winter maintenance, emergency lockout services, and professional upgrades for all lock types.
Our technicians use high-grade lubricants and tools designed for Canadian winters, ensuring your property stays secure and accessible all season.
👉 Call us today or book your Winter Lock Tune-Up Service online: 6478122520