1981–2010 normals; ECCC quality code “C” (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 | June 28 | June 16 | June 13 | June 7 | May 30 | May 26 | May 22 |
| Fall frost on or before | July 31 | August 16 | August 19 | August 25 | August 31 | September 5 | September 13 |
| Frost-free period ≤ (days) | 39 | 60 | 69 | 81 | 92 | 96 | 107 |
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 8 – April 22 |
| Sow peas, spinach, lettuce and radish outdoors (frost-tolerant) | May 6 – May 20 |
| Plant potatoes and onion sets | May 20 – June 3 |
| Transplant tomatoes and peppers; sow beans, corn, squash and cucumbers | June 10 – June 24 |
| Last sowing of quick crops (radish, lettuce, spinach) | July 17 – August 1 |
| Harvest or cover frost-tender crops | August 24 – August 31 |
| Plant garlic and spring bulbs | August 31 – September 28 |
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.
OpenCanadaData is independent and is not affiliated with or endorsed by these data publishers. Always check with the official source before you go.