Environment Canada is advising that southern Saskatchewan is expected to be blanketed by frost by Thursday morning. 

On average, the first frost in London usually arrives in the first week of October, but an Environment Canada advisory has already been issued.

Here's a basic list of what you should harvest when the temperatures dip to zero, and what can hold on for a couple more weeks.

The weather agency says temperatures will be “unseasonably cool” Sunday evening, continuing into Monday morning.

It may be the May long weekend, but all of Nova Scotia is under a frost advisory issued by Environment Canada. 

London's airport recorded a low of -3.7 degrees Wednesday morning, breaking the -1.7 degree record for May 13 set in 1946.

"The unusually cold air mass that brought record cold across southern Ontario this weekend isn't going anywhere quick," Global News meteorologist Ross Hull said.

Environment Canada has issued frost advisories for much of southwestern Ontario as temperatures near or below zero will result in overnight frost.

These rare and stunning frost flowers have been spotted on lakes and ponds around B.C. over the past week and a half.

Some beautiful examples of soft rime frost were submitted by viewers across the Prince George area.