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 | July 6 | June 30 | June 27 | June 21 | June 18 | June 13 | June 8 |
| Fall frost on or before | August 25 | September 8 | September 10 | September 16 | September 19 | September 21 | September 27 |
| Frost-free period ≤ (days) | 59 | 70 | 75 | 84 | 92 | 96 | 104 |
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 | April 24 – May 8 |
| Sow peas, spinach, lettuce and radish outdoors (frost-tolerant) | May 22 – June 5 |
| Plant potatoes and onion sets | June 5 – June 19 |
| Transplant tomatoes and peppers; sow beans, corn, squash and cucumbers | June 26 – July 10 |
| Last sowing of quick crops (radish, lettuce, spinach) | August 1 – August 16 |
| Harvest or cover frost-tender crops | September 8 – September 15 |
| Plant garlic and spring bulbs | September 15 – October 13 |
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 19:05 UTC.
Data Source: Environment and Climate Change Canada Environment and Climate Change Canada Data Servers End-use Licence.
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