Ontario, ON, Canada plant hardiness zones (gardening zones)
Plant hardiness zones (winter frost zones or gardening zones) range for Ontario (ON), Canada is:
- 0b
- 1a
- 1b
- 2a
- 2b
- 3a
- 3b
- 4a
- 4b
- 5a
- 5b
- 6a
- 6b
- 7a
by the Canadian PHZ scale.
Counties of Ontario (ON), Canada
- Hastings County
- 4a
- 4b
- 5a
- 5b
- 6a
- Frontenac County
- 4a
- 5a
- 5b
- 6a
- Grey County
- 5a
- 5b
- 6a
- Elgin County
- 6a
- 6b
- Dufferin County
- 5a
- 5b
- Bruce County
- 5b
- 6a
- Huron County
- 5b
- 6a
- 6b
- Lambton County
- 6b
- 7a
- Lanark County
- 5a
- 5b
- Lennox and Addington County
- 4b
- 5a
- 5b
- 6a
- Middlesex County
- 6a
- 6b
- Northumberland County
- 5b
- 6a
- 6b
- Perth County
- 5b
- 6a
- Renfrew County
- 4a
- 4b
- 5a
- Simcoe County
- 5a
- 5b
- 6a
- Sudbury District
- 3a
- 3b
- 4a
- 4b
- 5a
- Kenora District
- 0b
- 1a
- 1b
- 2a
- 2b
- 3a
- 3b
- 4a
- Timiskaming District
- 2a
- 3a
- 3b
- Nipissing District
- 3b
- 4a
- 4b
- Algoma District
- 2b
- 3a
- 3b
- 4b
- 5a
- Oxford County
- 6a
- 6b
- Niagara Region
- 6a
- 6b
- 7a
- Thunder Bay District
- 2b
- 3a
- 3b
- 4b
- Durham Region
- 5b
- 6a
- 6b
- Kawartha Lakes
- 5a
- 5b
- Peel Region
- 5a
- 5b
- 6a
- 6b
- Chatham-Kent
- 6b
- 7a
- Parry Sound District
- 4a
- 4b
- 5a
- 5b
- Cochrane District
- 1b
- 2a
- 2b
- 3a
- City of Ottawa
- 5a
- 5b
- Muskoka District
- 4b
- 5a
- 5b
- York Region
- 5b
- 6a
- Halton Region
- 5b
- 6a
- 6b
- Norfolk County
- 6a
- 6b
- City of Hamilton
- 6a
- 6b
- 7a