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

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

The frost season in Folsom

Last frost (average): February 13
In 1 year out of 10 it still freezes on March 11.
First frost: November 30
Frost-free season: 287 days
Frost after 15 May: in 0 % of years

Frost days per month in Folsom

January: 2.9 · 4 °C
February: 1.5 · 5 °C
March: 0.2 · 7 °C
April: 0 · 8 °C
May: 0 · 11 °C
June: 0 · 14 °C
July: 0 · 15 °C
August: 0 · 15 °C
September: 0 · 14 °C
October: 0 · 10 °C
November: 1.1 · 6 °C
December: 4.4 · 4 °C

Matched to the average lows of a weather station 33 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.