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 15 | July 15 | July 14 | July 13 | July 10 | July 5 | June 28 |
| Fall frost on or before | July 16 | July 17 | July 18 | July 19 | July 23 | July 24 | August 2 |
| Frost-free period ≤ (days) | 2 | 4 | 8 | 14 | 20 | 29 |
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 | May 14 – May 28 |
| Sow peas, spinach, lettuce and radish outdoors (frost-tolerant) | June 11 – June 25 |
| Plant potatoes and onion sets | June 25 – July 9 |
| Transplant tomatoes and peppers; sow beans, corn, squash and cucumbers | July 16 – July 30 |
| Last sowing of quick crops (radish, lettuce, spinach) | June 9 – June 24 |
| Harvest or cover frost-tender crops | July 17 – July 24 |
| Plant garlic and spring bulbs | July 24 – August 21 |
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 19:08 UTC.
Data Source: Environment and Climate Change Canada Environment and Climate Change Canada Data Servers End-use Licence.
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