Last Frost Date St. Catharines: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in St. Catharines? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in St. Catharines
- Last frost (average): April 19
- In 1 year out of 10 it still freezes on April 27.
- First frost: November 4
- Frost-free season: 202 days
- Frost after 15 May: in 0 % of years
Frost days per month in St. Catharines
- January: 28.9 · -7 °C
- February: 27 · -7 °C
- March: 23.7 · -3 °C
- April: 7.4 · 3 °C
- May: 0 · 9 °C
- June: 0 · 15 °C
- July: 0 · 17 °C
- August: 0 · 17 °C
- September: 0 · 13 °C
- October: 0.9 · 7 °C
- November: 12.3 · 1 °C
- December: 25.7 · -4 °C
- Matched to the average lows of a weather station 49 km away – accurate to about ±1–2 weeks.
- Daily minimum temperatures 2 m above ground over 30 years (1991–2020), NASA POWER; station data: Deutscher Wetterdienst (CC BY 4.0). Ground frost can form while the air at 2 m is still +2 to +3 °C.