A chip that sat quietly on your windshield all summer suddenly grows a ten centimetre leg the first frosty week of fall. It is not bad luck. It is physics, and it repeats every October in Quebec.
What cold actually does to damaged glass
Thermal contraction
As temperature drops, the glass contracts. A chip interrupts the structure, so the pulling forces concentrate at its edges and any micro crack extends.
Defroster shock
Blasting hot air at a frozen windshield creates a steep temperature difference between the inner and outer glass layers. That difference is a crack’s favourite meal.
Water and ice
Moisture seeps into the chip, then freezes and expands. Every freeze-thaw cycle wedges the crack a little wider from the inside.
The window for a cheap fix closes with the season
A chip is repairable; a long crack rarely is. As we showed in our chip vs crack guide, size, location and depth decide everything, and cold weather pushes all three in the wrong direction. A repair also works best on a clean, dry chip: once water, washer fluid and road salt have cycled through it for a winter, the resin bond and the optical result are never as good. If you have been putting it off since July, as many drivers do with rock chips, the weeks before the first hard freeze are the deadline that matters.
Warm the cabin gradually instead of full-blast defrost, use lukewarm washer fluid cycles rather than scraping hard over the chip, and never pour warm water on a frozen windshield. These do not fix anything, but they buy you time to get the repair done.
Repair it before the freeze, and it is a non-event
Caught early, a chip repair is a quick resin injection through our windshield repair service, and the whole seasonal drama never happens. Caught late, the same damage becomes a full replacement, possibly with camera recalibration. CAA-Québec’s advice on damaged windshields lands on the same conclusion: act while it is still small.
Still carrying a summer chip?
Send a photo before the first freeze and we will tell you if a quick repair can still save the glass.
This article is general information, not legal or insurance advice. Coverage varies by policy and vehicle, so confirm with your insurer or ask us for an exact quote.
