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Canadian Frost Dates

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These frost dates reflect the average frost date for a region and may not be reliable in a particular year. You may want to check with local gardeners for more accurate frost date information. In Prince Edward Island, most gardeners will tell you that we are not completely safe from frost until about June 8th, and a killing frost can happen in September.

Newfoundland

Station Last Frost First Frost
Corner Brook May 22 October 12
Grand Falls June 2 September 26
St. John's June 2 October 12

Nova Scotia

Station Last Frost First Frost
Halifax May 6 October 20
Kentville May 16 October 5
Shelburne May 14 September 29
Sydney May 24 October 13
Yarmouth May 1 October 18

Prince Edward Island

Station Last Frost First Frost
Charlottetown May 17 October 9
Summerside May 9 October 19
Tignish May 23 October 9

New Brunswick

Station Last Frost First Frost
Bathurst May 19 September 26
Edmunston May 28 September 18
Fredericton May 20 September 22
Grand Falls May 24 September 24
Moncton May 24 September 27
Saint John May 18 October 4

Quebec

Station Last Frost First Frost
Baie Comeau May 28 September 15
Chicoutimi May 17 September 30
Montreal May 3 October 7
Quebec May 13 September 29
Rimouski May 13 September 30
Sherbrooke June 1 September 10
Trois-Rivieres May 19 September 23
Thetford Mines May 28 September 14

Ontario

Station Last Frost First Frost
Barrie May 26 September 16
Hamilton April 29 October 15
Kingston May 2 October 10
London May 9 October 8
Ottawa May 6 October 5
Owen Sound May 12 October 15
Parry Sound May 17 September 28
Peterborough May 18 September 20
St. Catharines May 2 October 17
Sudbury May 17 September 25
Thunder Bay June 1 September 15
Timmins June 8 September 6
Toronto May 9 October 6
Windsor April 25 October 22

Manitoba

Station Last Frost First Frost
Brandon May 27 September 10
The Pas May 27 September 17
Thompson June 15 August 16
Winnipeg May 25 September 22

Saskatchewan

Station Last Frost First Frost
Moose Jaw May 20 September 18
Prince Albert June 2 September 4
Regina May 21 September 10
Saskatoon May 21 September 15
Weyburn May 22 September 12

Alberta

Station Last Frost First Frost
Athabaska June 1 August 29
Calgary May 23 September 15
Edmonton May 7 September 23
Grande Prairie May 18 September 13
Lethbridge May 17 September 18
Medicine Hat May 16 September 22
Red Deer May 25 September 9

British Columbia

Station Last Frost First Frost
Chilliwack April 6 November 9
Dawson Creek June 5 August 29
Kamloops May 1 October 5
Kelowna May 19 September 20
Nanaimo April 28 October 17
Port Alberni May 8 October 15
Prince George June 4 September 3
Terrace May 5 October 17
Vancouver March 28 November 5
Vernon April 28 October 4
Victoria April 19 November 5

Territories

Station Last Frost First Frost
Whitehorse June 11 August 25
Dawson City June 13 August 17
Yellowknife May 27 September 15