Last Frost Date Des Moines: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in Des Moines? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in Des Moines
- Last frost (average): April 18
- In 1 year out of 10 it still freezes on May 1.
- First frost: October 21
- Frost-free season: 181 days
- Frost after 15 May: in 0 % of years
Frost days per month in Des Moines
- January: 30.3 · -10 °C
- February: 26.3 · -8 °C
- March: 20.6 · -1 °C
- April: 5.7 · 5 °C
- May: 0.2 · 11 °C
- June: 0 · 17 °C
- July: 0 · 19 °C
- August: 0 · 18 °C
- September: 0 · 13 °C
- October: 3.8 · 6 °C
- November: 18.2 · -1 °C
- December: 28.9 · -7 °C
- Matched to the average lows of a weather station 9 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.