Frost Dates for Ontario - Victory Seed Company

Average First and Last Frost Dates
for
Ontario, Canada



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City	Spring	Fall
Barrie*	5/26	9/16
Hamilton	4/29	10/15
Kingston	5/2	10/10
London	5/9	10/8
Ottawa	5/6	10/5
Owen Sound	5/12	10/15
Parry Sound*	5/17	9/28
Peterborough	5/18	9/20
St. Catherines*	5/2	10/17
Sudbury	5/17	9/25
Thunder Bay	6/1	9/15
Timmins (Shania Twain's Hometown)	6/8	9/6
Toronto	5/9	10/6
Windsor	4/25	10/22

Source: Environment Canada. Dates are calculated based on a 30 year rolling average of the last spring and first fall frosts from station data compiled between the years 1961 to 1990. (1) Additionally, click here for more information.

* - Those locations marked with an asterisk are averaged from the dates 1951 to 1980.