Pennsylvania Frost Dates
Pennsylvania has a varied growing season shaped by hills, valleys, and the contrast between southeastern lowlands and northern or Appalachian terrain. Gardeners in the southeast often get a longer run, while mountain valleys and interior uplands stay alert for late spring frost.
Look up your exact frost dates
Frost timing shifts across Pennsylvania with elevation and distance from water. Enter your ZIP code for dates from your nearest weather station.
Pennsylvania locations
| ZIP | Area | Hardiness zone |
|---|---|---|
| 15421 | Deer Lake | 6a |
| 15472 | Oliver | 6b |
| 15610 | Bear Rocks | 6a |
| 15655 | Laurel Mountain | 6a |
| 15674 | Norvelt | 6b |
| 15904 | Oakland | 6b |
| 16137 | Mercer | 6a |
| 16312 | Sugar Grove | 5b |
| 16365 | Warren | 6a |
| 16802 | State College | 6b |
| 17103 | Harrisburg | 7a |
| 17516 | Conestoga | 7a |
| 18081 | Hellertown | 7a |
| 18641 | Avoca | 6b |
| 19061 | Linwood | 7b |
| 19102 | Philadelphia | 7b |
| 19103 | Philadelphia | 7b |
| 19130 | Philadelphia | 7b |
| 19343 | Glenmoore | 7a |
| 19526 | West Hamburg | 7a |
| 15001 | Aliquippa | 6b |
| 15003 | Ambridge | 6b |
| 15004 | Atlasburg | 6b |
| 15005 | Economy | 6b |
| 15006 | Bairdford | 6b |
| 15007 | Bakerstown | 6b |
| 15009 | Industry | 6b |
| 15010 | West Mayfield | 6b |
| 15012 | Fellsburg | 6b |
| 15014 | Brackenridge | 6b |
| 15015 | Bradford Woods | 6b |
| 15017 | Bridgeville | 6b |
| 15018 | Buena Vista | 6b |
| 15019 | Bulger | 6b |
| 15020 | Bunola | 6b |
| 15021 | Langeloth | 6b |
| 15022 | California | 6b |
| 15024 | Russellton | 6b |
| 15025 | Jefferson Hills | 6b |
| 15026 | Clinton | 6b |
| 15027 | Conway | 6b |
| 15028 | Coulter | 6b |
| 15030 | Arnold | 6b |
| 15031 | Cecil-Bishop | - |
| 15033 | Donora | 6b |
| 15034 | Dravosburg | 6b |
| 15035 | East McKeesport | 6b |
| 15037 | Blaine Hill | 6b |
| 15038 | Elrama | 6b |
| 15042 | Economy | 6b |
| 15043 | Hookstown | 6b |
| 15044 | Gibsonia | 6b |
| 15045 | Glassport | 6b |
| 15046 | Leetsdale | 7a |
| 15047 | Greenock | - |
| 15049 | Harwick | 6b |
| 15050 | Hookstown | 6b |
| 15051 | Dorseyville | 6b |
| 15052 | Industry | 6b |
| 15053 | Joffre | - |
Source: NOAA 1991–2020 U.S. Climate Normals (public domain) and USDA 2023 Plant Hardiness Zone Map. Page updated Aug 4, 2026.