Frost dates for W Chester 2 NW, PA
At W Chester 2 NW, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 18, for a typical growing season of 174 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 18First fall frost (median)50% chance of 32°F by this date
- 174 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 23 | May 7 | May 22 |
| 32°F | Apr 10 | Apr 26 | May 11 |
| 28°F | Mar 28 | Apr 11 | Apr 26 |
| 24°F | Mar 15 | Mar 31 | Apr 15 |
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 | Sep 27 | Oct 7 | Oct 22 |
| 32°F | Oct 4 | Oct 18 | Nov 1 |
| 28°F | Oct 14 | Oct 30 | Nov 11 |
| 24°F | Oct 29 | Nov 8 | Nov 24 |
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 | 134 days | 152 days | 171 days |
| 32°F | 152 days | 174 days | 194 days |
| 28°F | 178 days | 198 days | 218 days |
| 24°F | 203 days | 223 days | 245 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 |
|---|---|---|---|
| 19380 | 7a | 0 to 5°F | 3 km |
| 19383 | 7a | 0 to 5°F | 5 km |
| 19382 | 7a | 0 to 5°F | 5 km |
| 19341 | 7a | 0 to 5°F | 8 km |
| 19345 | 7a | 0 to 5°F | 9 km |
| 19319 | 7a | 0 to 5°F | 11 km |
| 19373 | 7a | 0 to 5°F | 12 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 USC00369464, at 39.9708, -75.6350, elevation 114 m (375 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 131.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Glenmoore (17 km)
- Avondale 2 N (18 km)
- Coatesville 2 W (19 km)
- Phoenixville 1 E (21 km)
- Marcus Hook (24 km)
- Norristown (30 km)
- Hopewell Morgantown (30 km)
- Pottstown Limerick Airport (30 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.