Planting Dates for Ontario
Ontario offers some of Canada's longest growing seasons in the south (zones 5-7) and shorter seasons in the north (zones 2-4). Southern Ontario's moderate climate is ideal for a wide range of vegetables.
Hardiness Zones 2a-7a • 115-200 frost-free days depending on location
Frost Dates in Ontario
Average last spring frost and first fall frost dates for Ontario cities. Use these to calculate your planting windows.
| City | Last Spring Frost | First Fall Frost | Frost-Free Days | Zone |
|---|---|---|---|---|
| Toronto | Apr 20 | Oct 30 | 193 | 6b |
| Ottawa | May 6 | Oct 1 | 148 | 5a |
| Hamilton | Apr 22 | Oct 22 | 183 | 6b |
| London | May 5 | Oct 6 | 154 | 6a |
Gardening Tips for Ontario
- ✓Southern Ontario gardeners can direct-sow warm crops by late May.
- ✓The Niagara region (zone 7a) supports tender perennials and early planting.
- ✓Northern Ontario gardeners should focus on short-season varieties and season extension.
- ✓Lake-effect moisture benefits gardens along the Great Lakes shoreline.
What to Plant in Ontario
Cold-Hardy Crops (plant early)
These crops tolerate frost and can be planted 2-6 weeks before your last frost date.
30-60 days from sowing
55-70 days from sowing
60-80 days from sowing
50-70 days from sowing
55-80 days from transplant
35-50 days from sowing
20-35 days from sowing
July-August the following year
90-120 days from transplant
70-120 days from planting
50-70 days from sowing
50-60 days from sowing
Warm-Season Crops (plant after last frost)
Start these indoors and transplant after all frost danger has passed.
60-85 days from transplant
60-90 days from transplant
50-65 days from sowing
50-65 days from sowing
45-60 days from sowing
60-100 days from sowing
30-60 days from sowing
Get Exact Planting Dates for Ontario
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Frequently Asked Questions
When is the last frost date in Ontario?
Last frost dates in Ontario vary by city: Toronto (Apr 20), Ottawa (May 6), Hamilton (Apr 22), London (May 5).
What hardiness zones are in Ontario?
Ontario spans hardiness zones 2a-7a. Your specific zone determines which perennials survive winter and when to start planting annuals.
What vegetables grow best in Ontario?
Hardy crops like peas, kale, spinach, and garlic thrive across Ontario. In warmer zones, tomatoes, peppers, and cucumbers do well with proper timing. Use our free calculator for exact planting dates.
How long is the growing season in Ontario?
115-200 frost-free days depending on location. Extend your season with cold frames, row covers, and indoor seed starting.
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