Can You Grow Leek in Ontario?
Canada · Canadian Zone 5 · zones 3, 4, 5, 6, 7
Leeks grow well here — cold-hardy and can be harvested into late autumn.
Plant zones
Ontario last frost
Ontario first frost
Days to harvest
When to plant Leeks in Ontario
Start indoors
Transplant
Harvest
Dates are approximate, based on Ontario's average frost dates. Your exact yard may vary by microclimate.
About Leek
Leeks are cold-hardy slow-growing vegetables that can be harvested well into autumn and even winter.
Start indoors in late winter — leeks need a very long season. Transplant deeply to blanch stems. Harvest after first frosts — cold improves flavour. Very cold-hardy surviving to -10°C.
Gardening in Ontario
Ontario spans several climate zones. Northern Ontario is Zone 3-4 with short seasons; southern Ontario is Zone 5-7 with long productive seasons. The Niagara Peninsula is one of Canada's premier fruit-growing regions.
Frequently asked questions
Can you grow Leek in Ontario?
Leeks grow well here — cold-hardy and can be harvested into late autumn.
What zone is Ontario?
Ontario spans Canadian Zone 5 (3, 4, 5, 6, 7).
When do you plant Leeks in Ontario?
Plant Leeks around mid-April (start indoors Jan 20), harvest Jul 24 – Sep 12.