A frost advisory has been issued for the city of Calgary.
Environment Canada says skies will clear overnight allowing for the possibility of frost in low lying areas.
Officials say people should take preventative measures to protect frost-sensitive plants and trees.
The advisory includes a good portion of the province.
Frost advisory for:
Calgary, Okotoks, High River, Claresholm, Airdrie, Cochrane, Olds, Sundre, Drumheller, Three Hills, Brooks, Strathmore, Vulcan, Rocky Mountain House, Caroline, Red Deer, Ponoka, Innisfail, Stettler, Hanna, Coronation, Oyen, Medicine Hat, Bow Island, Suffield, Cypress Hills Provincial Park, Foremost, Lethbridge, Taber, Milk River, Cardston, Fort Macleod, Magrath, Edmonton, St. Albert, Sherwood Park, Spruce Grove, Morinville, Mayerthorpe, Evansburg, Fort Saskatchewan, Vegreville, Redwater, Smoky Lake, Drayton Valley, Devon, Rimbey, Pigeon Lake, Leduc, Camrose, Wetaskiwin, Tofield, Westlock, Barrhead, Athabasca, Lloydminster, Wainwright, Vermilion, Provost, Bonnyville, St. Paul, Cold Lake, Lac la Biche, Whitecourt, Edson, Fox Creek, Swan Hills.