Frost may damage some crops in frost-prone areas.
Temperatures are forecast to fall to near zero degrees Celsius tonight. Patchy frost will be possible.
Frost is expected again Sunday night, with temperatures likely 1 or 2 degrees cooler than tonight.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or tweet reports using #ONStorm.