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

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

The frost season in Clay

Last frost (average): April 29
In 1 year out of 10 it still freezes on May 13.
First frost: October 22
Frost-free season: 170 days
Frost after 15 May: in 3 % of years

Frost days per month in Clay

January: 28.5 · -9 °C
February: 26.3 · -8 °C
March: 23.8 · -4 °C
April: 9.8 · 2 °C
May: 0.5 · 9 °C
June: 0 · 14 °C
July: 0 · 17 °C
August: 0 · 16 °C
September: 0.1 · 12 °C
October: 2.9 · 6 °C
November: 15.6 · 0 °C
December: 26.2 · -5 °C

Matched to the average lows of a weather station 13 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.