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Can You Grow Rhubarb in Ontario?
Canada · Canadian Zone 5 · zones 3, 4, 5, 6, 7
Rhubarb thrives here — it is extremely cold-hardy and needs cold winters to perform well.
Plant zones
Ontario last frost
Ontario first frost
Days to harvest
About Rhubarb
Rhubarb is extremely cold-hardy and productive — plant once and harvest stalks every spring for decades.
Plant crowns in spring. Never harvest the first year. Never eat the leaves — they are toxic. Mulch crowns in autumn. Divide every 5-7 years. Rhubarb actually improves after cold winters.
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 Rhubarb in Ontario?
Rhubarb thrives here — it is extremely cold-hardy and needs cold winters to perform well.
What zone is Ontario?
Ontario spans Canadian Zone 5 (3, 4, 5, 6, 7).
When do you plant Rhubarb in Ontario?
See the planting guide for Rhubarb — timing depends on your exact frost date.