Last spring frost
Mar 30
Frost Dates for Linwood, PA
First fall frost
Nov 16
Growing season
230 days
Hardiness zone
7b
In an average year around Linwood, PA, the last spring frost (32°F) is about Mar 30 and the first fall frost is about Nov 16, giving roughly a 230-day growing season. To be safe most years, wait until Mar 16 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Apr 22 | Apr 9 | Mar 30 |
| Freeze (32°F) | Apr 9 | Mar 30 | Mar 16 |
| Hard (28°F) | Mar 31 | Mar 20 | Mar 4 |
| Severe (24°F) | Mar 25 | Mar 11 | Feb 22 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 22 | Apr 17 | Apr 14 | Apr 11 | Apr 9 | Apr 6 | Apr 4 | Apr 2 | Mar 30 |
| 32°F | Apr 9 | Apr 5 | Apr 3 | Apr 1 | Mar 30 | Mar 27 | Mar 25 | Mar 21 | Mar 16 |
| 28°F | Mar 31 | Mar 28 | Mar 25 | Mar 22 | Mar 20 | Mar 17 | Mar 14 | Mar 10 | Mar 4 |
| 24°F | Mar 25 | Mar 20 | Mar 16 | Mar 14 | Mar 11 | Mar 8 | Mar 4 | Feb 28 | Feb 22 |
| 20°F | Mar 16 | Mar 11 | Mar 7 | Mar 4 | Mar 1 | Feb 26 | Feb 21 | Feb 14 | Feb 6 |
| 16°F | Mar 8 | Mar 2 | Feb 27 | Feb 22 | Feb 16 | Feb 10 | Feb 5 | Jan 31 | Jan 21 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Oct 21 | Nov 2 | Nov 17 |
| Freeze (32°F) | Nov 2 | Nov 16 | Dec 2 |
| Hard (28°F) | Nov 11 | Nov 28 | Dec 15 |
| Severe (24°F) | Nov 20 | Dec 11 | Jan 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 21 | Oct 26 | Oct 29 | Nov 1 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 17 |
| 32°F | Nov 2 | Nov 6 | Nov 10 | Nov 13 | Nov 16 | Nov 19 | Nov 23 | Nov 27 | Dec 2 |
| 28°F | Nov 11 | Nov 16 | Nov 19 | Nov 23 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 15 |
| 24°F | Nov 20 | Nov 29 | Dec 3 | Dec 6 | Dec 11 | Dec 15 | Dec 19 | Dec 24 | Jan 1 |
| 20°F | Dec 6 | Dec 13 | Dec 19 | Dec 24 | Dec 28 | Jan 1 | Jan 4 | Jan 9 | Jan 17 |
| 16°F | Dec 22 | Dec 28 | Jan 1 | Jan 5 | Jan 9 | Jan 13 | Jan 18 | Jan 24 | Feb 3 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Marcus Hook, Pa, about 0.3 miles away@if(!empty($station['elevation_ft'])), at 10 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Linwood, PA?
On average, the last spring frost (32°F) around Linwood, PA is about Mar 30. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 16.
When is the first frost in the fall?
The first fall frost around Linwood, PA typically arrives about Nov 16. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Mar 30 on average, or Mar 16 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 230 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 19061 Planting calendar → Pennsylvania frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026