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

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

The frost season in Lethbridge

  • Last frost (average): May 11
  • In 1 year out of 10 it still freezes on May 23.
  • First frost: October 2
  • Frost-free season: 139 days
  • Frost after 15 May: in 30 % of years

Frost days per month in Lethbridge

  • January: 29.7 · -10 °C
  • February: 27.4 · -9 °C
  • March: 26.9 · -5 °C
  • April: 16.1 · 0 °C
  • May: 3.4 · 5 °C
  • June: 0 · 9 °C
  • July: 0 · 13 °C
  • August: 0.1 · 12 °C
  • September: 1 · 7 °C
  • October: 11.9 · 1 °C
  • November: 24.6 · -4 °C
  • December: 30.1 · -9 °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.