Length of growing season in Ontario

Note: Some of the content is wider than usual.

Baseline: 1971-2000

Growing season (1971-2000) for Ontario

Description of this image follows.
Description - Growing season (1971-2000) for Ontario

Map representing the length of growing season days based on current agricultural extent data (1971 to 2000) for Ontario.

Current agricultural extent:

All areas of the province immediately north and to the south of Sault Ste. Marie and Sudbury. An area that includes Timmins and extends to areas to the north, northeast and southeast of the city, as well as an area south of the city that also extends along the north-south border with Quebec. Areas that include Thunder Bay and extend northeast and northwest of the city, along the shore and inland of Lake Superior and the United States border. Small areas on and just north of the westernmost part of the United States border and on the southwest corner of the province at the border with Manitoba and the United States.

Baseline: 1971-2000 - Current agricultural extent: Growing season
Greater than
170 days
160-170
days
150-160
days
140-150
days
130-140
days
120-130
days
110-120
days
100-110
days
Less than
100 days
Eastern (including: Ottawa, Kingston) Yes Yes Yes Yes No No No No No
Central (including: Toronto, Georgian Bay) Yes Yes Yes Yes No No No No No
Southwest (including: Kitchener, Hamilton, London, Sarnia, Windsor) Yes Yes No No No No No No No
Northeast (including: Sault St. Marie, Sudbury, Timmins) No Yes Yes Yes Yes Yes Yes Yes Yes
Northwest (including: Thunder Bay) No No No Yes Yes Yes Yes Yes Yes

Climate change scenario: 2010-2039

Growing season (2010-2039) for Ontario

Description of this image follows.
Description - Growing season (2010-2039) for Ontario

Map representing the length of growing season days based on climate change scenario data (2010 to 2039) for Ontario.

Current agricultural extent:

All areas of the province immediately north and to the south of Sault Ste. Marie and Sudbury. An area that includes Timmins and extends to areas to the north, northeast and southeast of the city, as well as an area south of the city that also extends along the north-south border with Quebec. Areas that include Thunder Bay and extend northeast and northwest of the city, along the shore and inland of Lake Superior and the United States border. Small areas on and just north of the westernmost part of the United States border and on the southwest corner of the province at the border with Manitoba and the United States.

Climate change scenario: 2010-2039 - Current agricultural extent: Growing season
Greater than
170 days
160-170
days
150-160
days
140-150
days
130-140
days
120-130
days
110-120
days
100-110
days
Less than
100 days
Eastern (including: Ottawa, Kingston) Yes Yes No No No No No No No
Central (including: Toronto, Georgian Bay) Yes Yes Yes No No No No No No
Southwest (including: Kitchener, Hamilton, London, Sarnia, Windsor) Yes No No No No No No No No
Northeast (including: Sault St. Marie, Sudbury, Timmins) No Yes Yes Yes Yes Yes Yes Yes Yes
Northwest (including: Thunder Bay) No No Yes Yes Yes Yes Yes Yes Yes

Summary of length of growing season comparing 1971 to 2000 to projected climate change in 2010 to 2039

The Coupled Global Climate Model (CGCM 3.1) predicts a 1 to 2 degree Celsius increase in monthly average temperatures by 2010 to 2039, resulting in earlier crop seeding dates, and later fall frost dates.

Summary of length of growing season comparing 1971 to 2000 to projected climate change in 2010 to 2039
Length of
Growing Season (days)
1971 to 2000 Baseline
(Percent of total area)
2010 to 2039 CGCM 3.1
(Percent of total area)
> 170 2.5 8.2
160-170 3.5 4.6
150-160 3.4 3.6
140-150 6.0 11.7
130-140 12.3 17.2
120-130 14.6 21.3
110-120 20.3 17.7
100-110 19.2 7.8
< 100 18.2 7.8

Climate data and future scenario:

Limitations

Maps prepared by Agriculture and Agri-Food Canada's Science and Technology Branch (STB) in partnership with Environment Canada's National Service Office-Agriculture.

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