Last spring frost
Apr 16
Frost Dates for Russellton, PA
First fall frost
Nov 2
Growing season
199 days
Hardiness zone
6b
In an average year around Russellton, PA, the last spring frost (32°F) is about Apr 16 and the first fall frost is about Nov 2, giving roughly a 199-day growing season. To be safe most years, wait until Mar 31 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) | May 16 | Apr 29 | Apr 14 |
| Freeze (32°F) | May 2 | Apr 16 | Mar 31 |
| Hard (28°F) | Apr 16 | Apr 3 | Mar 19 |
| Severe (24°F) | Apr 6 | Mar 25 | Mar 10 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 16 | May 10 | May 5 | May 2 | Apr 29 | Apr 25 | Apr 22 | Apr 19 | Apr 14 |
| 32°F | May 2 | Apr 26 | Apr 21 | Apr 18 | Apr 16 | Apr 12 | Apr 9 | Apr 5 | Mar 31 |
| 28°F | Apr 16 | Apr 12 | Apr 8 | Apr 5 | Apr 3 | Apr 1 | Mar 29 | Mar 25 | Mar 19 |
| 24°F | Apr 6 | Apr 2 | Mar 30 | Mar 28 | Mar 25 | Mar 20 | Mar 18 | Mar 15 | Mar 10 |
| 20°F | Mar 29 | Mar 25 | Mar 21 | Mar 18 | Mar 15 | Mar 12 | Mar 8 | Mar 4 | Feb 27 |
| 16°F | Mar 21 | Mar 16 | Mar 12 | Mar 9 | Mar 5 | Mar 2 | Feb 26 | Feb 19 | Feb 11 |
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 7 | Oct 21 | Nov 3 |
| Freeze (32°F) | Oct 20 | Nov 2 | Nov 16 |
| Hard (28°F) | Nov 2 | Nov 14 | Dec 1 |
| Severe (24°F) | Nov 9 | Nov 25 | Dec 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 7 | Oct 12 | Oct 15 | Oct 18 | Oct 21 | Oct 23 | Oct 26 | Oct 30 | Nov 3 |
| 32°F | Oct 20 | Oct 24 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 16 |
| 28°F | Nov 2 | Nov 5 | Nov 9 | Nov 11 | Nov 14 | Nov 16 | Nov 20 | Nov 24 | Dec 1 |
| 24°F | Nov 9 | Nov 14 | Nov 18 | Nov 21 | Nov 25 | Nov 28 | Dec 1 | Dec 6 | Dec 12 |
| 20°F | Nov 19 | Nov 25 | Nov 30 | Dec 3 | Dec 7 | Dec 10 | Dec 15 | Dec 20 | Dec 27 |
| 16°F | Dec 1 | Dec 6 | Dec 11 | Dec 16 | Dec 20 | Dec 24 | Dec 29 | Jan 1 | Jan 10 |
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: Natrona Lock 4, Pa, about 4.5 miles away@if(!empty($station['elevation_ft'])), at 760 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 Russellton, PA?
On average, the last spring frost (32°F) around Russellton, PA is about Apr 16. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 31.
When is the first frost in the fall?
The first fall frost around Russellton, PA typically arrives about Nov 2. 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 Apr 16 on average, or Mar 31 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 199 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 15084 Planting calendar → Pennsylvania frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026