Last Frost Date Edmonton: Frost Dates, Late Frost Risk & Growing Season

When is the last spring frost and the first autumn frost in Edmonton? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.

The frost season in Edmonton

Last frost (average): May 20
In 1 year out of 10 it still freezes on May 27.
First frost: September 15
Frost-free season: 117 days
Frost after 15 May: in 63 % of years

Frost days per month in Edmonton

January: 31 · -18 °C
February: 28.3 · -16 °C
March: 31 · -11 °C
April: 24.4 · -3 °C
May: 7.5 · 3 °C
June: 0.1 · 7 °C
July: 0 · 9 °C
August: 0.2 · 8 °C
September: 6.2 · 3 °C
October: 24.5 · -3 °C
November: 29.8 · -10 °C
December: 31 · -17 °C

Matched to the average lows of a weather station 22 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.