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Will it freeze in Pottstown in the next 7 nights?
No overnight lows at or below 32°F are forecast in Pottstown during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 59°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 59°F Above 36°F · Light Rain
- Fri, Nov 6 47°F Above 36°F · Partly Cloudy
- Sat, Nov 7 40°F Above 36°F · Partly Cloudy
- Sun, Nov 8 37°F Above 36°F · Mostly Clear
- Mon, Nov 9 35°F Frost possible · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 33°F Frost possible · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Pottstown
The median first fall hard-freeze date (28°F) is November 3, from NOAA’s 1991–2020 Climate Normals at Pottstown Limerick Airport. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 18 · May 2 · May 19 | Oct 1 · Oct 12 · Oct 26 | 162 days |
| 32°F freeze | Apr 5 · Apr 20 · May 6 | Oct 9 · Oct 23 · Nov 5 | 186 days |
| 28°F hard freeze | Mar 23 · Apr 6 · Apr 21 | Oct 19 · Nov 3 · Nov 18 | 212 days |
Average high temperature by month
1991–2020 normals at Pottstown Limerick Airport
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Pottstown, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Pottstown Limerick Airport (station USW00054782, elevation 291 ft), 4.7 mi from Pottstown. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Pottstown
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Birdsboro, PA | 8.7 mi | Apr 16 | Oct 27 |
| Phoenixville, PA | 11 mi | Apr 18 | Oct 27 |
| Collegeville, PA | 11 mi | Apr 24 | Oct 15 |
| Reading, PA | 16 mi | Apr 14 | Oct 29 |
| Downingtown, PA | 17 mi | Apr 26 | Oct 18 |
| Shillington, PA | 17 mi | Apr 14 | Oct 29 |
| Souderton, PA | 17 mi | Apr 26 | Oct 17 |
| Wyomissing, PA | 18 mi | Apr 14 | Oct 29 |
| Norristown, PA | 19 mi | Apr 8 | Oct 31 |
| Bridgeport, PA | 19 mi | Apr 8 | Oct 31 |
Frequently asked questions
When is the last frost in Pottstown?
On average, the last spring frost (32°F) in Pottstown is around April 20. In about 1 year in 10 it comes after May 6, and in 9 years in 10 it comes after April 5.
When is the first frost in Pottstown?
The first fall frost (32°F) usually arrives around October 23. There’s a 10% chance of a freeze by October 9 and a 90% chance by November 5.
Can it frost in Pottstown after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 2.
What growing zone is Pottstown?
Pottstown is in USDA Plant Hardiness Zone 7a (average annual extreme minimum temperature 0 to 5°F), based on the 2023 USDA map for ZIP code 19464. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · frost vs. freeze