Frost Chart for Canada

Frosty Maple Leaf

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Below is a chart showing Canada frost dates in the spring and fall for various Canadian cities. (Click here for the U.S. frost dates.) 

PLEASE NOTE: The reference source for Canadian frost dates is Environment Canada’s National Climate Services. The last time their data set was calculated was for the 1981 to 2010 Normals. Below are some dates for select cities. If your city is not listed, click here

Canadian Frost Dates

Dates below reflects 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 112 May 21 Sept. 10
Calgary AB 107 May 26 Sept. 10
Edmonton AB 132 May 10 Sept. 19
Grande Prairie AB 120 May 16 Sept. 13
Lethbridge AB 123 May 18 Sept. 18
Medicine Hat AB 127 May 14 Sept. 18
Peace River AB 109 May 21 Sept. 7
Red Deer AB 108 May 24 Sept. 9
Abbotsford BC 186 Apr. 20 Oct. 23
Castlegar BC 159 May 1 Oct. 7
Chilliwack BC 204 Apr. 11 Nov. 1
Coombs BC 151 May 7 Oct. 5
Dawson Creek BC 90 June 4 Sept. 2
Kamloops BC 159 Apr. 30 Oct. 6
Kelowna BC 130 May 16 Sept. 23
Nanaimo BC 175 Apr. 26 Oct. 18
Prince George BC 93 May 31 Sept. 1
Prince Rupert BC 158 May 9 Oct. 14
Vancouver BC 229 Mar. 27 Nov. 11
Victoria BC 205 Apr. 14 Nov. 5
Brandon MB 115 May 22 Sept. 14
Lynn Lake MB 99 June 4 Sept. 11
The Pas MB 116 May 26 Sept. 19
Thompson MB 70 Jun. 14 Aug. 23
Winnipeg MB 121 May 24 Sept. 22
Bathurst NB 132 May 17 Sept. 26
Fredericton NB 128 May 17 Sept. 22
Miramichi NB 128 May 20 Sept. 25
Moncton NB 127 May 23 Sept. 27
Saint John NB 139 May 17 Oct. 3
Corner Brook NL 141 May 23 Oct. 11
Gander NL 130 June 3 Oct. 11
Grand Falls NL 117 June 4 Sept. 29
St. John’s NL 136 June 1 Oct. 15
Halifax NS 177 May 1 Oct. 25
Kentville NS 134 May 20 Oct. 1
Sydney NS 145 May 24 Oct. 16
Truro NS 115 May 30 Sept. 22
Yarmouth NS 177 Apr. 29 Oct. 23
Fort Simpson NT 91 May 27 Aug. 26
Norman Wells NT 100 May 27 Sept. 4
Yellowknife NT 113 May 28 Sept. 18
Barrie ON 158 May 5 Oct. 10
Brantford ON 162 May 1 Oct. 10
Hamilton ON 168 Apr. 28 Oct. 13
Kapuskasing ON 95 June 8 Sept. 11
Kingston ON 168 Apr. 26 Oct. 11
London ON 154 May 8 Oct. 9
Ottawa ON 148 May 7 Oct. 2
Owen Sound ON 163 May 5 Oct. 15
Peterborough ON 133 May 14 Sept. 24
Sudbury ON 133 May 17 Sept. 27
Timmins ON 94 June 7 Sept. 9
Toronto ON 158 May 4 Oct. 9
Wawa ON 104 June 5 Sept. 17
Windsor ON 186 Apr. 22 Oct. 25
Alberton PE 129 May 28 Oct. 4
Charlottetown PE 152 May 18 Oct. 17
Summerside PE 167 May 6 Oct. 20
Baie Comeau QC 114 May 26 Sept. 17
La Tuque QC 114 May 30 Sept. 21
Magog QC 142 May 14 Oct. 3
Montreal QC 163 Apr. 29 Oct. 9
Quebec QC 139 May 12 Sept. 28
Rimouski QC 146 May 15 Oct. 8
Roberval QC 124 May 23 Sept. 24
Thetford Mines QC 136 May 17 Sept. 30
Trois-Rivieres QC 131 May 18 Sept. 26
Moose Jaw SK 123 May 17 Sept. 17
North Battleford SK 119 May 21 Sept. 17
Prince Albert SK 101 June 1 Sept. 10
Regina SK 105 May 28 Sept. 10
Saskatoon SK 116 May 22 Sept. 15
Weyburn SK 118 May 20 Sept. 15
Yorkton SK 115 May 22 Sept. 14
Dawson YT 72 June 4 Aug. 15
Watson Lake YT 94 May 30 Sept. 1
Whitehorse YT 87 June 4 Aug. 30

For the link to more frost dates, please click here.

Source: 

Courtesy of Environment Canada

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Actual ast frost date

I'm trying to find out the actual last frost date was last year (2015) in my city (Prince George, BC), rather than the average. And if possible for the last few years.

Frost fee days...Canadian record

Does anyone know the record for frost-free days in Canada? I might have witnessed a frost-free cycle longer than one calendar year in my neighborhood...Any thoughts?

I would like to see some

I would like to see some frost info for Northwest Ontario. There is no info for anything west of Thunder Bay in Ontario. I would like to see info for Dryden, Vermilion Bay, Sioux Lookout, and Red Lake included. Our weather conditions are very different, from the rest of Ontario.

For any data that is not

For any data that is not listed on our page, you can check Environment Canada's Canadian Climate Normals database at the following location. Some weather stations will include the "Frost Free" category:
http://climate.weather.gc.ca/c...
Once you select a province and weather station, click on the link to take you to the main data page, then click on the "Normals" tab, then at the next page, scroll down until you see "Frost-Free" category--click to expand and see the data.
Dryden lists 127 frost-free days on average. Last spring frost: May 16; first fall frost: September 21.
http://climate.weather.gc.ca/c...
I could not find a weather station for Vermilion Bay.
Sioux Lookout lists 128 frost-free days on average. Last spring frost: May 19; first fall frost: September 25.
http://climate.weather.gc.ca/c...
Red Lake lists 111 frost-free days on average. Last spring frost: May 29; first fall frost: September 18.
http://climate.weather.gc.ca/c...

The dates shown here for

The dates shown here for Victoria are from the Airport, located 25 km north of the city in an area extremely prone to frost. This is not reflective of Victoria. To state that Vancouver and Chilliwack have longer frost free periods than Victoria is, of course, ridiculous. At the Victoria Gonzales weather station, located in the City of Victoria near the Strait of Juan de Fuca, the average frost free period for 1981-2010 was 307 days (Feb. 7 to Dec. 11).

I thought that the last frost

I thought that the last frost date for Victoria being April 19th was way too late too. Especially this year (2015) with our really long and early spring.

But ... I live in Saanich (Quadra/McKenzie area) and noticed a light frost on the neighbours roofs on April 7 and April 9 2015.

It was pretty light and most of the stuff I had planted out survived, except some buckwheat cover crop. So maybe April 19th isn't so crazy after all.

I see lots of information

I see lots of information about frost dates, but we are looking for the average date that the ground freezes with regard to the fall planting of garlic. The cloves generally need three weeks to establish before ground freeze up and wondering if Nov. 15 is too late, or could we expect the ground not to settle into a frozen state 6 inches down until mid December. We are located north of Belleville Ontario. Thanks

Our advice is to plant fall

Our advice is to plant fall garlic soon after the first major winter frost of the year, usually between mid-October and late November depending on your local climate. Cover the garlic with straw to protect it.

talking with a garlic farmer

talking with a garlic farmer from Kitchener, i find out that end of Sept mid October the garlic is planted every year regardless of the firs frost date.
i hope this help
nick

I live in the metrotown area

I live in the metrotown area of burnaby bc. Though bordering vancouver to the west & richmond to the south. At just 300m Burnaby sees the number of cooler days & earlier, deeper lasting snows are on ave years considerable in late nov to early march. The 2000's are an exception excluding 2008-09 when buraby saw nearly 200 cm's in a 4 week period. However many such events with temps of -18 (low) & -10 daytime highs though somewhat rare have occuredoccured several winters in the last 60 years. The ave snowfall of 45 cm's at YVR (Richmond) -9' below sea level & where the GVRD has its weather measured is sparsely populated sich that central Vancouver seems a different region many winters. This affects forecasting done in Toronto leaving many of our harshest winter storm post forcasted. The latter 60's early & mid 70's are an example...68-69; 71-72 75-76, 81-82, 84-85;85-86; 88-89;90-91; 92-93; 96-97; 97-
98 some good few examples.The 2000's are less typical excluding a couple years & 2008-09 where we had over 200 cm's from before xmas until Feb...I would love to see data collected for Burnaby heights & the tri-cities...this would with historic charts counted over at least 60 years.

2008-09 wherewe had approxlso

Would love to see dates for

Would love to see dates for Bridesville, BC and Rock Creek, BC if possible. I'm at 3500 ft and really need to keep track of that first frost. If I can get past that one, we usually see 2 more weeks of frost free days adding to the very short growing season. Thanks

We do not have frost

We do not have frost information for Bridesville/Rock Creek. Environment Canada is updating their frost information and we hope to get some updated dates in the near future. You can go to http://climate.weather.gc.ca/ and type in your location to get some historical weather data. It looks like your average first frost date is in mid- to late-October.

In 2013 the first frost came

In 2013 the first frost came in conjunction with the Harvest Moon, I suppose it varied slightly from ranch to ranch due to the lay of the land. We had 2 nights of "light" frost, then, the very hard frost came about 2 weeks after that. In 2012, (going only from memory), we received the first frost about the same time and had another 2-3 weeks of frost free growing.

I'm trying to decide if it's

I'm trying to decide if it's too late to seed Canola - June 10/2013. I'm looking for frost information for 2012 and predictions for 2013 for Regina, SK area. Can you help? THANKS

You might try

You might try contacting:

1)

Canola Council of Canada
400-167 Lombard Avenue
Winnipeg, Manitoba
R3B 0T6
Phone: (204) 982-2100
Toll-Free: (866) 834-4378

2)

Environment Canada
Manitoba Office (there isn't one in Saskatchewan)
150-123 Main Street
Winnipeg, Manitoba
R3C 4W2
Telephone: 204-984-6203
Fax: 204-983-0964
Email: enviroinfo@ec.gc.ca

3) There is also a service called "Weather One-on-One" where you can talk to an Environment Canada meteorologist on the phone, for a fee per minute (about $2.99 per minute, plus taxes). The number is: 1-900-565-5555

Here is more information about this service:

http://www.ec.gc.ca/meteo-weat...

I appreciate your website

I appreciate your website I've got a lot of helpful info in place. But I'm wondering if you could add a few more spots for Nova Scotia such as Bridgewater, Liverpool, Shelburne, Barrington Passage, Clarks Harbour, Digby, Pubnico and Argyle.

We will update all our

We will update all our Canadian frost dates and add locations when Environment Canada has updated their database. You can find some additional locations for Nova Scotia at
www.gardencoacheschat.com/cana...

I am trying to find "Frost

I am trying to find "Frost Date" information for my city in Canada but even googling I can only find this stat for only a limited # of Ontario locations. Any ideas where are more comprehensive data base can be found on-line?

We are waiting for

We are waiting for Environment Canada to update their data. For Ontario, at least, you can find more data here: http://www.omafra.gov.on.ca/en...

i hoped to see dates for

i hoped to see dates for Whitehorse, Yukon, which is the Territory's capital

Dear sirs: To claim that the

Dear sirs: To claim that the Greater Toronto Area has only 149 frost free days,with all due respect,is utterly absurd,even though,toronto's growing season fluctuates considerably from year to year,it's hard to beleave that Hamilton,which is only about 20 miles away from Toronto would have such longer a growing season than Greater Toronto.

These dates are from

These dates are from Environment Canada, compiled from data between 1961 through 1990. We will investigate whether they have made any recent revisions to their dates.

In the meantime, you might check the following Web page from the Ontario Ministry of Agriculture, Food, and Rural Affairs. This page lists frost dates from Ontario. According to this study, using data from 1976 through 2000, Toronto is in Zone B, where the average frost dates are April 30 and October 13.

http://www.omafra.gov.on.ca/en...

With all due

With all due respect...Hamilton is more like 50+ miles south of Toronto. Some of the factors that may contribute to the difference are that Hamilton also has the escarpment which surrounds much of this area. The escarpment provides allot of protection like a micro-climate. I also believe that having the influence of 2 great lakes around us has an effect as well. At least some things to consider.

I would like to see some

I would like to see some frost dates for Labrador. NF is not just the island of Newfoundland. I live in Western Labrador and there is nothing for Labrador or even Northern Quebec to estimate off of. Please help.

We will add more locations to

We will add more locations to our chart when we can verify the dates. In the meantime we suggest that you visit the Environment Canada website or www.gardencoacheschat.com/cana....

You have a great almanac for

You have a great almanac for many things but your frost dates for Charlottetown,PEI and for Abbotsford,BC are totally incorrect.
I grew up in PEI and lived there for 40 years. Then I moved to Chilliwack,BC twenty years ago.
I am an avid gardener and I know for a fact that PEI gets a late snowstorm every year in May. In fact, I have seen snow in PEI every month of the year except July and August! The frost warning is only up about June 10th or so. ( Call them at Vesey Seeds, Charlottetown, PEI because they would always warn us to not plant seedlings until the frost warning was up in June!
As for Abbotsford, BC---- I live just a half hour drive east of Abbotsford in Chilliwack,BC and Abbotsford's winter/spring weather is definitely warmer than here in Chilliwack. There is a definite difference of earlier warmth in Abbotsford than in Chilliwack. The farther east you go from Vancouver, the cooler it gets in springtime before hot summer weather descends.
Your frost predictions seem about on for Chilliwack,BC but are definitely incorrect for PEI and for Abbotsford,BC.
I hope this helps you with creating a more accurate almanac.

Hi, Elizabeth, Thanks for

Hi, Elizabeth, Thanks for your kind words. The frost data reference is Environment Canada. (We do not create frost dates.) 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. Keep in mind that these trended frost dates do not really address microclimates so your own records may provide a better average for your needs. See more here: http://www.weatheroffice.gc.ca...

What about the full moon June

What about the full moon June 4th? Could this moon create a frost situation in Southwestern Ontario?

Air temperature is not

Air temperature is not affected by Moon phase. It is affected by the season and whether there is a cloud cover, among other things. On a clear night, heat rises from Earth if there is no cloud cover holding it in. This might make you think it's colder because there is a full Moon, but it's really colder just because the sky is clear.

does any one know the frost

does any one know the frost dates for baddeck ns

hi would like to know the

hi would like to know the frost dates for estler in williams lake bc, its higher up on the mountain so its different than the city
thanks

This is great, thank you!

This is great, thank you! How about St. Catharines (6a and 6b depending where in city https://glfc.cfsnet.nfis.org/m...) and any predictions for last frost for 2012 since it has been one of the warmest with low temps predicted to be higher than seasonal highs for the next couple weeks?

Thank you!

The Abbotsford, B.C. data

The Abbotsford, B.C. data can't possibly be correct as it lies between Vancouver and Chilliwack but is slightly more south? The first frost does not come before Halloween, ever. I always leave my houseplants outside until the week of Halloween. The data should be somewhere between Vancouver and Chilliwack data, as Chilliwack is usually a little colder Thanks.

The data is correct last year

The data is correct last year Agassiz hit 50 F in the middle of winter it was very strange as the only other place was San Fransisco I checked the current temps on google earth. Also we are the hottest spot on record in the fraser valley. 20 minutes east of Chilliwack I guess it must be the mountains holding the heat.

Good Work !

Hi,
I would like to see some Eastern Alberta spot for freeze and other weather reports.
Thank You !

Hi, Kate, OK, we've added

Hi, Kate, OK, we've added more dates for Eastern Alberta on the chart above. And, if it helps, the link to more frost dates in Alberta is
www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex10

nice information.

nice information.

Hello, all, Environment

Hello, all, Environment Canada provides for 5 locations in Kelowna. We adjusted the date for a longer growing period. Thank you for commenting.

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.

The Environment Canada people

The Environment Canada people at the airport frequently do not identify the correct conditions on their website, ie the clouds versus sun etc. We have far more frost free days than what information they have supplied you with. Thanks!

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

Ken, We've added a few more

Ken, We've added a few more dates for eastern Alberta. Also, the link to more frost dates in Alberta is
www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex10

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