Plant Hardiness Zones of Canada

Developed by
Agriculture and Agri-Food Canada
Vote
791 votes with an average of 2.4
Description

The Plant Hardiness Zones map outlines the different zones in Canada where various types of trees, shrubs and flowers will most likely survive. It is based on the average climatic conditions of each area. The first such map for North America, released by the United States Department of Agriculture in 1960, was based only on minimum winter temperatures. In 1967, Agriculture Canada scientists created a plant hardiness map using Canadian plant survival data and a wider range of climatic variables, including minimum winter temperatures, length of the frost-free period, summer rainfall, maximum temperatures, snow cover, January rainfall and maximum wind speed.

Natural Resources Canada's Canadian Forest Service scientists have now updated the plant hardiness zones using the same variables and more recent climate data (1961-90). They have used modern climate mapping techniques and incorporated the effect of elevation. The new map indicates that there have been changes in the hardiness zones that are generally consistent with what is known about climate change. These changes are most pronounced in western Canada.

The new hardiness map is divided into nine major zones: the harshest is 0 and the mildest is 8. Subzones (e.g., 4a or 4b, 5a or 5b) are also noted in the map legend. These subzones are most familiar to Canadian gardeners. Some significant local factors, such as micro-topography, amount of shelter and subtle local variations in snow cover, are too small to be captured on the map. Year-to-year variations in weather and gardening techniques can also have a significant impact on plant survival in any particular location.

Keywords
  • plants
  • trees
  • shrubs
  • flowers
Device Formats

Comments

Pete - November 09, 2018

Hi

This map is difficult to use because of the lag when zooming in and out. In addition, there are no zone labels making it only good for relative comparisons.

You have work to do. Best to remove the link to an un-useable map. Thanks.

Jean - February 23, 2019

The app needs the water bodies and highways/roads defined as well as the zones themselves defined right on the map. Some folks are colour-blind.

Monica Keown - October 28, 2018

The map is nice except thst it does not allow a person to have an infornation button. I can search my area but cannot received the actual zone information easily. Other interactive maps have this feature? Could it be incorporated into this one?

Lorraine Pike - February 08, 2018

We want to plant mosquitoe repellant plants in the South River area. We found a tree called a Cadaga tree and wondered if there is anything like this we could plant in that area.

Lyne Lalancette - January 01, 2018

Bonjour, j'aimerais connaître la zone de rusticité de la ville de Québec (quartier de Sillery). Merci et bonne année !

open-ouvert - April 11, 2017

Armand, sorry for the delay in getting back to you. Here is the response from the data owner:

“I am not sure I entirely understand the question….the web site which is now up again after being “unavailable for quit a long time does show the 1981/2010 version of the zones (both the canadian and US approaches). We don’t normally have models for individual years (eg 2015) although we are in the midst of doing some work to show the annual variability in the hardiness indices/zones at that time step through time from 1950.

New climate “averages” or “normals" happen every 10 years…hopefully we will all be around at that stage and do those updates at that time (i.e. the 1991/2021 period)."

I hope that helps!
Momin, the Open Government team on behalf of Agriculture and Agri-Food Canada.

Armand L. - April 12, 2017

I shouldn't have said 2015, I meant the 1981-2010 zones. I think got the publication year 2015 from a CBC article to describe the latest version of the zones, but that may be incorrect.
This "Plant Hardiness Zones of Canada" app (http://open.canada.ca/en/apps/plant-hardiness-zones-canada) has the 1961-1990 zones, which are used for this map: http://www.agr.gc.ca/phz
What I'm wondering is when will this data and its map update to the same new 1981-2010 zones as used for http://planthardiness.gc.ca/?m=1
Thank you!

open-ouvert - May 04, 2017

“Natural Resources Canada is the owner and publisher of the new Plant Hardiness Zone data. As such Agriculture and Agri-food Canada is only a data consumer. AAFC will be waiting upon NRCAN to release the data and web mapping services and hopefully a web application. NRCAN should be contacted to in regards to when this data will be released to the public and if or when a web application will be created.”

Momin, the Open Government team on behalf of AAFC

Diane Buder - October 24, 2016

Plants have always been a big part of my life, what I'm interested about now
Pampas grass. Some info there would be wonderful

Pam irving - August 05, 2016

I live in port Rowan Ontario my first question is what zone am I in and second would boxwood grow ok in this area. Thanking you

Allison - August 05, 2016

Hi Pam - I used the app above (clicked on the "Get this App" button) and searched for Port Rowan. Looks like, according to this map, you're in zone 5b. I'm not completely sure how well boxwood will grow, but a quick search on plantscanada.ca indicated English Boxwood should be fine in Canadian Hardiness Zones 4a-7a (so your 5b should be just fine). You might consider reaching out to your local plant nursery to see if there is a particular variety of boxwood they would recommend for growing in your region.

Hope this helps!

Bill Shackell - March 30, 2016

Dear sirs i am trying to find out what the zones is for a property that i own. It is south of mount laurier quebec about 25 miles. the co-ordinated are 46.5 by 75.0. I tried using your web site but nothing happens when i enter either the name or number. What i want to know is what apples trees would do well on my land.

open-ouvert - March 30, 2016

Hi Bill,

This from the data owner:
“I was able to navigate to the location both ways.

1. In the search box I entered Mount Laurier Quebec and the application zoomed me to the location.
2. I open up the measurement tools and moved my mouse until I found -75 by 45.5.

In both cases the it appears the zone you are in is 3b.

I hope this helps.”

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