Environment Canada has indicated a risk of patchy frost for the Lethbridge area for the night of May 19, 2026, as cold temperatures bring a chance of frost to parts of southern Alberta. Residents with gardens are encouraged to cover any frost-sensitive plants to protect them from potential damage.
While the official Environment Canada forecast for the city lists an overnight low of plus 5 degrees Celsius, frost advisories are in effect for nearby communities. The agency issues these advisories when freezing temperatures or widespread frost are possible during the growing season. Nearby communities including Cardston and Fort MacLeod are under a frost risk tonight, with forecast lows reaching plus 4 degrees Celsius.
This advisory comes during a time of year when many local gardeners have already begun planting. According to historical climate data, the average last spring frost date for the region typically falls around May 25.
Warmer, more stable conditions are expected later in the week. The forecast indicates that sunny weather will return by Thursday, with temperatures steadily climbing to reach a high of 24 degrees Celsius by Saturday.
