Last Frost Date Denver: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in Denver? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in Denver
- Last frost (average): May 12
- In 1 year out of 10 it still freezes on May 20.
- First frost: October 4
- Frost-free season: 145 days
- Frost after 15 May: in 27 % of years
Frost days per month in Denver
- January: 30.2 · -7 °C
- February: 27.5 · -6 °C
- March: 25.8 · -3 °C
- April: 16.9 · -1 °C
- May: 4.3 · 5 °C
- June: 0 · 10 °C
- July: 0 · 14 °C
- August: 0 · 13 °C
- September: 1 · 9 °C
- October: 10.2 · 2 °C
- November: 23.2 · -3 °C
- December: 30 · -7 °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.