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 30 | April 26 | April 22 | April 14 | April 8 | March 31 | March 21 |
| Fall frost on or before | October 17 | October 28 | October 31 | November 5 | November 9 | November 11 | November 24 |
| Frost-free period ≤ (days) | 172 | 189 | 192 | 204 | 218 | 222 | 231 |
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 | February 10 – February 24 |
| Sow peas, spinach, lettuce and radish outdoors (frost-tolerant) | March 10 – March 24 |
| Plant potatoes and onion sets | March 24 – April 7 |
| Transplant tomatoes and peppers; sow beans, corn, squash and cucumbers | April 14 – April 28 |
| Last sowing of quick crops (radish, lettuce, spinach) | September 21 – October 6 |
| Harvest or cover frost-tender crops | October 29 – November 5 |
| Plant garlic and spring bulbs | November 5 – December 3 |
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 18:59 UTC.
Data Source: Environment and Climate Change Canada Environment and Climate Change Canada Data Servers End-use Licence.
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