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What to Plant in October in Ontario

Here's what you can plant in Ontario during October. Since Ontario spans multiple USDA zones, planting dates vary by location. Find your zone below.

Zone 4a

View full Zone 4a planting guide for October

Harvest

Zone 4b

View full Zone 4b planting guide for October

Harvest

Zone 5b

View full Zone 5b planting guide for October

Harvest

Zone 6a

View full Zone 6a planting guide for October

Harvest

Zone 6b

View full Zone 6b planting guide for October

Harvest

Zone 7a

View full Zone 7a planting guide for October

Harvest

Zone 7b

View full Zone 7b planting guide for October

Harvest

Zone 8a

View full Zone 8a planting guide for October

Harvest

Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Last updated: April 2026.