1981–2010 normals; ECCC quality code “A” (A = WMO “3 and 5 rule”; B ≥ 25 years; C ≥ 20 years; D ≥ 15 years of data). An average is not a guarantee: a late frost is still possible.
| 10% | 25% | 33% | 50% | 66% | 75% | 90% | |
|---|---|---|---|---|---|---|---|
| Spring frost (0 °C or lower) on or after | April 21 | April 6 | April 1 | March 27 | March 22 | March 16 | March 4 |
| Fall frost on or before | October 16 | October 27 | October 31 | November 5 | November 11 | November 13 | November 25 |
| Frost-free period ≤ (days) | 189 | 209 | 214 | 224 | 233 | 238 | 249 |
Example: the spring 10% column is the date after which a frost occurs in only one year in ten.
| Start tomatoes, peppers and eggplant indoors | January 21 – February 4 |
| Sow peas, spinach, lettuce and radish outdoors (frost-tolerant) | February 18 – March 4 |
| Plant potatoes and onion sets | March 4 – March 18 |
| Transplant tomatoes and peppers; sow beans, corn, squash and cucumbers | March 25 – April 8 |
| Last sowing of quick crops (radish, lettuce, spinach) | September 26 – October 11 |
| Harvest or cover frost-tender crops | November 3 – November 10 |
| Plant garlic and spring bulbs | November 10 – December 8 |
General gardening rules of thumb computed from this station's average last/first frost dates; they are not ECCC data. Adjust to local conditions and seed-packet instructions.
Environment and Climate Change Canada — Canadian Climate Normals 1981–2010 (station data, MSC Datamart) (30-year averages; not updated). Retrieved 2026-10-18 19:02 UTC.
Data Source: Environment and Climate Change Canada Environment and Climate Change Canada Data Servers End-use Licence.
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