Last Frost Date Calgary: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in Calgary? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in Calgary
- Last frost (average): May 23
- In 1 year out of 10 it still freezes on June 4.
- First frost: September 19
- Frost-free season: 118 days
- Frost after 15 May: in 77 % of years
Frost days per month in Calgary
- January: 30.8 · -12 °C
- February: 28 · -11 °C
- March: 30.2 · -7 °C
- April: 23.8 · -3 °C
- May: 9.5 · 2 °C
- June: 0.3 · 6 °C
- July: 0.1 · 9 °C
- August: 0.2 · 9 °C
- September: 4.1 · 4 °C
- October: 19.7 · -1 °C
- November: 28.5 · -7 °C
- December: 30.8 · -11 °C
- No weather station nearby: plain grid values, which are often a little too cold – dates may therefore be late.
- 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.