Last Frost Date Allentown: Frost Dates, Late Frost Risk & Growing Season
When is the last spring frost and the first autumn frost in Allentown? Frost dates from 30 years of data, the risk of late frost, frost-free days and planting dates.
The frost season in Allentown
- Last frost (average): April 15
- In 1 year out of 10 it still freezes on April 25.
- First frost: October 27
- Frost-free season: 192 days
- Frost after 15 May: in 0 % of years
Frost days per month in Allentown
- January: 26.6 · -6 °C
- February: 23.9 · -5 °C
- March: 19.1 · -1 °C
- April: 4.9 · 5 °C
- May: 0.1 · 10 °C
- June: 0 · 16 °C
- July: 0 · 18 °C
- August: 0 · 17 °C
- September: 0 · 13 °C
- October: 1.7 · 7 °C
- November: 13.5 · 1 °C
- December: 24.3 · -3 °C
- Matched to the average lows of a weather station 8 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.