Frost dates for Phoenixville 1 E, PA
At Phoenixville 1 E, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 27, for a typical growing season of 192 days. For a 90% chance that the last frost has passed, wait until May 4. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 18Last spring frost (median)50% chance of 32°F after this date
- May 4Safer planting date10% chance of 32°F after this date
- Oct 27First fall frost (median)50% chance of 32°F by this date
- 192 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 17 | Apr 30 | May 17 |
| 32°F | Apr 3 | Apr 18 | May 4 |
| 28°F | Mar 20 | Apr 3 | Apr 18 |
| 24°F | Mar 7 | Mar 23 | Apr 4 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 2 | Oct 15 | Nov 1 |
| 32°F | Oct 12 | Oct 27 | Nov 9 |
| 28°F | Oct 24 | Nov 6 | Nov 23 |
| 24°F | Nov 4 | Nov 19 | Dec 6 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 146 days | 168 days | 189 days |
| 32°F | 168 days | 192 days | 212 days |
| 28°F | 198 days | 217 days | 238 days |
| 24°F | 221 days | 241 days | 264 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 19453 | 7a | 0 to 5°F | 2 km |
| 19460 | 7a | 0 to 5°F | 3 km |
| 19442 | 7a | 0 to 5°F | 7 km |
| 19355 | 7a | 0 to 5°F | 9 km |
| 19301 | 7a | 0 to 5°F | 9 km |
| 19312 | 7a | 0 to 5°F | 11 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00366927, at 40.1211, -75.4942, elevation 26 m (85 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 117.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Graterford 1 E (13 km)
- Norristown (13 km)
- Pottstown Limerick Airport (14 km)
- W Chester 2 NW (21 km)
- Glenmoore (22 km)
- Sellersville (30 km)
- Willow Grove NAS (31 km)
- Phila Franklin Inst (33 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.