Does Cold Weather Make Windshield Cracks Worse? | Safelite
Does Cold Weather Make Windshield Cracks Worse?
Yes, cold weather makes windshield cracks worse. A chip that has been sitting unrepaired for weeks can spread into a full-length crack overnight when temperatures drop. Understanding why this happens and what to do about it can save you from an avoidable and expensive windshield replacement.
Why Cold Weather Worsens Cracks
Glass expands and contracts in response to temperature changes. In cold weather, the outer surface of your windshield cools and contracts while the inner surface, warmed by your car's heater, stays relatively warm. That difference in temperature creates tension across the glass, and existing damage is the weakest point where that tension gets released. A small chip that your windshield could hold together under normal conditions becomes a crack when the glass is under that kind of stress.
Common Winter Habits That Make Cracks Worse
A few everyday cold weather habits can put extra stress on a damaged windshield:
Blasting the defroster: Pointing high heat directly at a cold windshield creates an intense temperature gradient across the glass. If there is existing damage, that stress often causes it to spread immediately.
Using wipers on ice: Running your wipers across a frozen or partially frozen windshield puts direct physical pressure on the glass. If there is existing damage in the wiper path, that pressure can cause the crack to spread.
Slamming doors in the cold: Cold glass is less flexible than warm glass, and the vibration from a slammed door sends a shockwave through the windshield.
How to Prevent Further Windshield Damage:
Repair chips immediately: Get small chips fixed before freezing weather arrives. Contact a licensed technician to determine if you need a windshield crack repair or replacement.
Use a windshield cover: Windshield covers can prevent ice buildup and further damage.
Clear snow and ice from windshield gently: Ice scrapers can cause further damage to windshield cracks and chips.
When Cold Weather Damage Requires a Full Replacement
Not all cold-weather windshield damage can be repaired. Sometimes, a replacement is the only option. Your replacement may also require professional ADAS recalibration to ensure your driver assistance systems function correctly after new glass is installed.
Don't Wait for Winter to Make It Worse
At Safelite, our technicians can assess your windshield damage and tell you whether repair or replacement is the right call before cold weather takes the decision out of your hands. We also offer mobile service that comes to your home or office. Schedule your service today and get ahead of the cold.
Frequently Asked Questions
Q: Does cold weather expand windshield cracks? A: They can. Cold temperatures cause glass to contract, putting stress on existing damage and causing cracks to spread. Rapid temperature changes, like going from a cold exterior to a heated interior, or blasting the defroster on a frozen windshield, are especially likely to cause a chip or small crack to grow significantly.
Q: Can a windshield chip expand from cold weather? A: Yes, and it happens more often than drivers expect. If moisture gets into a chip or crack and freezes, the expansion of the ice forces the glass apart from the inside. A chip that was small in the evening can be a full-length crack by morning after a hard freeze.
Q: How to prevent windshield crack from spreading in cold weather? A: Most importantly, it’s best get the damage repaired as soon as possible. Cold weather will continue to stress the crack every day it goes unaddressed.
Q: Will my insurance cover a windshield crack caused by cold weather? A: Many comprehensive auto insurance policies cover windshield repair and replacement regardless of cause, including cold weather damage. Some states require insurers to waive the deductible for glass claims. Check with your provider before scheduling service to understand what your policy covers.