Frost Chart for Canada

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 [3].) 

PLEASE NOTE: The reference source for Canadian frost dates is Environment Canada's National Climate Services. Unfortunately, they have not updated the information in many years.  The last time their data set was calculated was for the 1951–1980 Normals. Here at the Almanac, we will certainly update the data as soon as it is made available.

Canadia Frost Dates

If your city is not listed, click here [4].

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	88	Jun. 1	Aug. 29
Calgary	AB	114	May 23	Sept. 15
Edmonton	AB	138	May 7	Sept. 23
Elk Point	AB	92	June 1	Sept. 1
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
Vegreville	AB	85	June 5	Aug. 29
Vermilion	AB	107	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	156	May 4	Oct. 8
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

The link to more frost dates in Alberta is
www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex10 [5]