Plant Hardiness Zones of Canada
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.
Marianne Dickson - January 16, 2019
Good App, thank you.
Pete - November 09, 2018
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.
open-ouvert - November 09, 2018
Sorry you did not find this data useful. I have forwarded your feedback to the data owner for consideration.
If there is anything else I can assist you with please do not hesitate to let me know.
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 !
Denise - December 26, 2017
What zone is Walkerton, Ontario in, please?
Anne Franchetto - October 07, 2017
What is the hardiness zone for Cloyne Ontario
open-ouvert - October 12, 2017
Please visit this link for the growing zone: http://www.agr.gc.ca/atlas/agpv?webmap-en=78529700717d4cab81c13e9f9404e… I hope that helps. Momin, the Open Government team.
Astrid Norris - September 17, 2018
the link has no zones
cant seem to find that info anywhere on your site
David Lai - August 09, 2017
What is the growing zone for richmond hill ontario
Laurie - May 07, 2017
What is the growing zone for london ontario
open-ouvert - May 08, 2017
Hi Laurie, please visit this link for the growing zone: http://www.agr.gc.ca/atlas/agpv?webmap-en=78529700717d4cab81c13e9f9404e…
I hope that helps.
Momin, the Open Government team.
Yolande Nakamachi - April 26, 2017
I leave in southern Quebec and would like to know the zone for my area.
open-ouvert - April 26, 2017
Hi Yolande, you can find the Plant Hardiness Zones map here: http://www.agr.gc.ca/atlas/agpv?webmap-en=78529700717d4cab81c13e9f9404e…
Momin, the Open Government team.
Armand L. - March 28, 2017
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
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
Armand L. - May 04, 2017
Thanks! I will look for their contact information.
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
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.”
Linda Thompson - March 18, 2016
I appreciate the zone maps to assist my gardening choices