Allentown, PA Frost Dates
The last spring frost in Allentown usually comes around April 20 and the first fall frost around October 24.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | April 20 | October 24 |
| Hard freeze, 28°F | April 5 | November 4 |
Growing season: about 184 days.
Frequently asked questions
When is the last frost in Allentown, PA?
The median date of the last spring frost (32°F) is April 20. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past April 20 lowers the risk for tender plants.
When is the first frost in Allentown?
The median date of the first fall frost (32°F) is October 24, and a hard freeze (28°F) usually follows around November 4.
How long is the growing season in Allentown?
About 184 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USW00014737. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.