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Will it freeze in Philadelphia in the next 7 nights?
No overnight lows at or below 32°F are forecast in Philadelphia during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 62°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 62°F Above 36°F · Light Rain Likely
- Fri, Nov 6 52°F Above 36°F · Partly Cloudy
- Sat, Nov 7 45°F Above 36°F · Partly Cloudy
- Sun, Nov 8 42°F Above 36°F · Mostly Clear
- Mon, Nov 9 41°F Above 36°F · Mostly Clear
- Tue, Nov 10 43°F Above 36°F · Mostly Clear
- Wed, Nov 11 38°F Above 36°F · 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 Philadelphia
The median first fall hard-freeze date (28°F) is November 29, from NOAA’s 1991–2020 Climate Normals at Phila Franklin Inst. 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 | Mar 27 · Apr 8 · Apr 23 | Oct 23 · Nov 5 · Nov 20 | 211 days |
| 32°F freeze | Mar 15 · Mar 30 · Apr 12 | Nov 4 · Nov 17 · Dec 4 | 232 days |
| 28°F hard freeze | Mar 1 · Mar 17 · Mar 31 | Nov 12 · Nov 29 · Dec 18 | 257 days |
Average high temperature by month
1991–2020 normals at Phila Franklin Inst
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 Philadelphia, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Phila Franklin Inst (station USC00366886, elevation 60 ft), 4.1 mi from Philadelphia. 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 Philadelphia
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Palmyra, NJ | 5.0 mi | Apr 15 | Oct 31 |
| Camden, NJ | 5.0 mi | Mar 30 | Nov 17 |
| Collingswood, NJ | 6.8 mi | Apr 15 | Oct 31 |
| Gloucester City, NJ | 8.1 mi | Mar 30 | Nov 17 |
| Yeadon, PA | 8.1 mi | Apr 2 | Nov 10 |
| Audubon, NJ | 8.7 mi | Apr 15 | Oct 31 |
| Lansdowne, PA | 8.7 mi | Apr 2 | Nov 10 |
| Darby, PA | 9.3 mi | Apr 2 | Nov 10 |
| Haddonfield, NJ | 9.3 mi | Apr 15 | Oct 31 |
| Haddon Heights, NJ | 9.9 mi | Apr 15 | Oct 31 |
Frequently asked questions
When is the last frost in Philadelphia?
On average, the last spring frost (32°F) in Philadelphia is around March 30. In about 1 year in 10 it comes after April 12, and in 9 years in 10 it comes after March 15.
When is the first frost in Philadelphia?
The first fall frost (32°F) usually arrives around November 17. There’s a 10% chance of a freeze by November 4 and a 90% chance by December 4.
Can it frost in Philadelphia 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 April 8.
What growing zone is Philadelphia?
Philadelphia is in USDA Plant Hardiness Zone 7b (average annual extreme minimum temperature 5 to 10°F), based on the 2023 USDA map for ZIP code 19140. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · UV index today in Philadelphia · frost vs. freeze