The answer to 'ridge vent ice dams' is that ridge vents can contribute to the formation of ice dams, which are buildups of ice that prevent proper drainage from your roof. This happens when warm air escapes through the ridge vent, causing snow to melt and then refreeze at the roof's edge, creating a dam that traps water and leads to leaks and damage.
To prevent this, ensure your ridge vent is properly installed and insulated, and consider adding additional attic insulation and ventilation to reduce warm air escaping. You may also need to clear snow and ice dams manually, but this can be dangerous, so it's best to call a professional roofer if the problem persists.