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Frost Dates by Province in Canada

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Knowing your frost dates is the first step to a thriving garden in Canada’s varied climates. Whether you’re in a short northern growing season or a longer coastal one, understanding when the first and last frosts hit in your province helps you time planting, extend harvests, and avoid frost damage. This guide gives you the key dates for each province so you can plan with confidence, but even the weatherman can't this right. One year he said "no more frost" and we lost all of our vegetable plants. Now I just go my my gardening notes.

British Columbia

Chilliwack – Last Frost: Mar 21–31, First Frost: Nov 11–20
Maple Ridge – Last Frost: April 1-10, First Frost: November 11-20,
Kelowna – Last Frost: Apr 21–30, First Frost: Oct 21–31
Kamloops – Last Frost: May 1–10, First Frost: Oct 1–10
Telkwa – Last Frost: May 21–31, First Frost: Oct 1–10
Vancouver – Last Frost: Mar 21–31, First Frost: Nov 11–20
Victoria – Last Frost: Mar 1–10, First Frost: Nov 11–20

Alberta

Edmonton – Last Frost: May 1–10, First Frost: Sep 11–20
Calgary – Last Frost: May 11–20, First Frost: Sep 11–20
Lethbridge – Last Frost: May 21–31, First Frost: Sep 1–10

Saskatchewan

Regina – Last Frost: May 11–20, First Frost: Sep 11–20
Moose Jaw – Last Frost: May 11–20, First Frost: Sep 11–20
Prince Albert – Last Frost: May 21–31, First Frost: Sep 11–20
Saskatoon – Last Frost: Jun 1–10, First Frost: Sep 11–20

Manitoba

Winnipeg – Last Frost: May 21–31, First Frost: Sep 21–30
Brandon – Last Frost: May 21–31, First Frost: Sep 11–20
The Pas – Last Frost: May 21–31, First Frost: Sep 11–20

Ontario

Colborne – Last Frost: May 21–31, First Frost: Oct 1–10
Toronto – Last Frost: May 11–20, First Frost: Nov 1–10
Windsor – Last Frost: Apr 11–20, First Frost: Oct 21–31
Ottawa – Last Frost: May 1–10, First Frost: Oct 1–10
Hamilton – Last Frost: May 1–10, First Frost: Oct 11–20
Barrie – Last Frost: May 11–20, First Frost: Oct 1–10

Québec

Montréal – Last Frost: Apr 21–30, First Frost: Oct 1–10
Québec City – Last Frost: May 1–10, First Frost: Sep 21–30
Sherbrooke – Last Frost: May 11–20, First Frost: Sep 21–30

New Brunswick

Fredericton – Last Frost: May 11–20, First Frost: Sep 21–30
Moncton – Last Frost: May 11–20, First Frost: Oct 1–10
Saint John – Last Frost: May 1–10, First Frost: Oct 21–30
Bathurst – Last Frost: May 11–20, First Frost: Sep 21–30

Nova Scotia

Halifax – Last Frost: Apr 21–30, First Frost: Oct 11–20
Kentville – Last Frost: May 11–20, First Frost: Oct 1–10
Sydney – Last Frost: May 11–20, First Frost: Oct 11–20

Prince Edward Island

Charlottetown – Last Frost: May 11–20, First Frost: Oct 11–20
Summerside – Last Frost: May 21–30, First Frost: Oct 1–10

Newfoundland & Labrador

St. John’s – Last Frost: May 21–31, First Frost: Oct 11–20
Corner Brook – Last Frost: May 21–31, First Frost: Oct 11–20

Northern Territories (YT, NT, NU)

General – Last Frost: Late May to Early June, First Frost: Late August to Early September