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Average First and Last Frost Dates for Canada
Average frost dates are only a rough guide since the dates can vary by two or three weeks each year. At spring planting time, it's best to take close notice of the local longterm weather forecast to tell whether it is safe to plant tender plants.
Provinces
Cities
Last Frost Day
First Frost Day
Growing Season Length
Alberta
Athabaska
June 1
August 29
88 Days
Calgary
May 23
September 15
113 Days
Edmonton
May 7
September 23
136 Days
Grand Prairie
May 18
September 13
116 Days
Lethbridge
May 17
September 18
122 Days
Medicine Hat
May 16
September 22
127 Days
Red Deer
May 25
September 9
105 Days
British Columbia
Dawson Creek
June 5
August 29
83 Days
Vancouver
March 28
November 5
221 Days
Victoria
April 19
November 5
199 Days
Manitoba
Brandon
May 27
September 10
105 Days
Thompson
June 15
August 16
62 Days
Winnipeg
May 25
September 22
120 Days
New Brunswick
Bathurst
May 19
September 26
128 Days
Fredericton
May 20
September 22
124 Days
Saint John
May 18
October 4
138 Days
Newfoundland
St. John's
June 2
October 12
131 Days
NWT and Yukon
Whitehorse
June 11
August 25
75 Days
Yellowknife
May 27
September 15
110 Days
Nova Scotia
Halifax
May 6
October 20
166 Days
Sydney
May 24
October 13
140 Days
Yarmouth
May 1
October 18
169 Days
Ontario
Barrie
May 26
September 16
111 Days
Hamilton
April 29
October 15
168 Days
Kingston
May 2
October 10
160 Days
London
May 9
October 8
151 Days
Ottawa
May 6
October 5
150 Days
Owen Sound
May 12
October 15
154 Days
Peterborough
May 18
September 20
123 Days
St. Catherines
May 2
October 17
166 Days
Sudbury
May 17
September 25
129 Days
Thunder Bay
June 1
September 15
105 Days
Timmins
June 8
September 6
88 Days
Toronto
May 9
October 6
148 Days
Prince Edward Island
Charlottetown
May 17
October 9
143 Days
Quebec
Montreal
May 3
October 7
126 Days
Quebec City
May 13
September 29
138 Days
Sherbrooke
June 1
September 10
100 Days
Saskatchewan
Moose Jaw
May 20
September 18
119 Days
Regina
May 21
September 10
110 Days
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