Environment Canada issued a frost advisory for Calgary late Friday afternoon.
Just before 3:30 p.m., the agency posted that “temperatures overnight are expected to drop to, or below the freezing mark. Frost is expected.”
It advised Calgary residents to “take preventative measures to protect frost-sensitive plants and trees.”
The forecast low for Friday night is 0 degrees, with a 30 per cent chance of showers early in the evening and northwest winds gusting up to 50 km/h.
Saturday is forecast to be sunny and 16 degrees, with the temperature forecast to climb all the way back to summer-like temperatures close to 30 degrees by mid-week.