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 | May 7 | May 1 | April 30 | April 20 | April 10 | April 7 | March 26 |
| Fall frost on or before | September 30 | October 11 | October 16 | October 23 | October 31 | November 4 | November 18 |
| Frost-free period ≤ (days) | 156 | 167 | 173 | 180 | 199 | 213 | 223 |
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 17 – October 2 |
| Harvest or cover frost-tender crops | October 25 – November 1 |
| Plant garlic and spring bulbs | November 1 – November 29 |
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 19:01 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.