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

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

The frost season in Casper

Last frost (average): May 14
In 1 year out of 10 it still freezes on May 22.
First frost: October 3
Frost-free season: 141 days
Frost after 15 May: in 37 % of years

Frost days per month in Casper

January: 30.7 · -9 °C
February: 27.6 · -8 °C
March: 26.7 · -4 °C
April: 18 · -1 °C
May: 4.7 · 4 °C
June: 0 · 10 °C
July: 0 · 15 °C
August: 0 · 14 °C
September: 0.8 · 9 °C
October: 11.6 · 1 °C
November: 24.8 · -4 °C
December: 30.4 · -8 °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.