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