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Frost Chart for Canada

Source: Courtesy of Environment Canada

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Below is a chart showing frost dates in the spring and fall for various Canadian cities. (Also, see our frost dates for U.S. cities.) 

Dates given for Canada are normal averages for a light freeze (29° to 32°F, or -2° to 0°C); local weather and topography may cause considerable variations. The possibility of frost occurring after the spring dates and before the fall dates is 50 percent. The classification of freezing temperatures is usually based on their effect on plants. A light freeze kills only tender plants, with little destructive effect on other vegetation.

City Province Growing Season
(Length in Days)
Last Frost
Spring
First Frost
Fall
Athabasca AB 88 Jun. 1 Aug. 29
Calgary AB 114 May 23 Sept. 15
Edmonton AB 138 May 7 Sept. 23
Grande Prairie AB 117 May 18 Sept. 13
Lethbridge AB 123 May 17 Sept. 18
Medicine Hat AB 128 May 16 Sept. 22
Peace River AB 99 May 26 Sept. 3
Red Deer AB 106 May 25 Sept. 9
Abbotsford BC 177 Apr. 24 Oct. 18
Chilliwack BC 216 Apr. 6 Nov. 9
Dawson Creek BC 84 Jun. 5 Aug. 29
Kamloops BC 156 May 1 Oct. 5
Kelowna BC 123 May 19 Sept. 20
Nanaimo BC 171 Apr. 28 Oct. 17
Nelson BC 159 May 4 Oct. 13
Port Alberni BC 159 May 8 Oct. 15
Prince George BC 91 Jun. 4 Sept. 3
Prince Rupert BC 156 May 9 Oct. 13
Vancouver BC 221 Mar. 28 Nov. 5
Victoria BC 200 Apr. 19 Nov. 5
Brandon MB 105 May 27 Sept. 10
Lynn Lake MB 89 Jun. 8 Sept. 6
The Pas MB 112 May 27 Sept. 17
Thompson MB 61 Jun. 15 Aug. 16
Winnipeg MB 119 May 25 Sept. 22
Bathurst NB 129 May 19 Sept. 26
Edmundston NB 112 May 28 Sept. 18
Fredericton NB 124 May 20 Sept. 22
Moncton NB 125 May 24 Sept. 27
Saint John NB 139 May 18 Oct. 4
Corner Brook NF 142 May 22 Oct. 12
Gander NF 123 Jun. 3 Oct. 5
Grand Falls NF 115 Jun. 2 Sept. 26
St. John's NF 131 Jun. 2 Oct. 12
Halifax NS 166 May 6 Oct. 20
Kentville NS 141 May 16 Oct. 5
Sydney NS 141 May 24 Oct. 13
Truro NS 113 May 30 Sept. 21
Yarmouth NS 169 May 1 Oct. 18
Aklavik NT 76 Jun. 13 Aug. 31
Fort Simpson NT 81 Jun. 3 Aug. 24
Yellowknife NT 110 May 27 Sept. 15
Barrie ON 112 May 26 Sept. 16
Hamilton ON 168 Apr. 29 Oct. 15
Kapuskasing ON 87 Jun. 12 Sept. 8
Kingston ON 160 May 2 Oct. 10
Kitchener ON 139 May 11 Sept. 29
London ON 151 May 9 Oct. 8
Ottawa ON 151 May 6 Oct. 5
Owen Sound ON 155 May 12 Oct. 15
Peterborough ON 124 May 18 Sept. 20
Sudbury ON 130 May 17 Sept. 25
Thunder Bay ON 105 Jun. 1 Sept. 15
Timmins ON 89 Jun. 8 Sept. 6
Toronto ON 149 May 9 Oct. 6
Windsor ON 179 Apr. 25 Oct. 22
Charlottetown PE 150 May 17 Oct. 14
Summerside PE 162 May 9 Oct. 19
Tignish PE 138 May 23 Oct. 9
Baie Comeau QC 109 May 28 Sept. 15
Chicoutimi QC 133 May 17 Sept. 30
Montreal QC 156 May 3 Oct. 7
Quebec QC 139 May 13 Sept. 29
Rimouski QC 139 May 13 Sept. 30
Sherbrooke QC 100 Jun. 1 Sept. 10
Tadoussac QC 141 May 13 Oct. 2
Thetford Mines QC 106 May 28 Sept. 14
Trois-Rivieres QC 124 May 19 Sept. 23
Moose Jaw SK 120 May 20 Sept. 18
North Battleford SK 120 May 19 Sept. 17
Prince Albert SK 93 Jun. 2 Sept. 4
Regina SK 111 May 21 Sept. 10
Saskatoon SK 116 May 21 Sept. 15
Weyburn SK 112 May 22 Sept. 12
Yorkton SK 110 May 23 Sept. 11
Dawson YT 62 Jun. 13 Aug. 17
Watson Lake YT 91 Jun. 2 Sept. 4

I think the Kelowna and

I think the Kelowna and Nelson data might be reversed. Kelowna has a much longer growing season and definitely doesn't have first frost by Sept 20th.

The dates given are courtesy

The dates given are courtesy of Environment Canada, and they are the normal averages for a light freeze. As stated above, local weather and topography may cause considerable variations.

Hello! I would like to see

Hello!
I would like to see some Eastern Alberta locations for frost and other weather reports.
Thank You
Ken