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 | July 1 | June 20 | June 16 | June 9 | June 2 | May 30 | May 21 |
| Fall frost on or before | August 2 | August 12 | August 18 | August 26 | September 1 | September 5 | September 13 |
| Frost-free period ≤ (days) | 47 | 68 | 71 | 76 | 80 | 88 | 97 |
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 16 – April 30 |
| Sow peas, spinach, lettuce and radish outdoors (frost-tolerant) | May 14 – May 28 |
| Plant potatoes and onion sets | May 28 – June 11 |
| Transplant tomatoes and peppers; sow beans, corn, squash and cucumbers | June 18 – July 2 |
| Last sowing of quick crops (radish, lettuce, spinach) | July 12 – July 27 |
| Harvest or cover frost-tender crops | August 19 – August 26 |
| Plant garlic and spring bulbs | August 26 – September 23 |
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 18:56 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.