Frost Dates in Pennsylvania
Across 160 NOAA weather stations in Pennsylvania, the average last spring frost falls between March 30 at Marcus Hook and May 24 at Kane 1NNE. At a typical Pennsylvania station it is around April 29, with the first fall frost around October 20 and a frost-free season of about 174 days.
Find the frost dates for your ZIP code
A typical Pennsylvania season
What shapes frost dates in Pennsylvania
- The frost-free season ranges from 126 days at Kane 1NNE to 232 days at Phila Franklin Inst.
- Elevation matters: Hidden Valley, at 2,876 ft, averages its last frost on May 2, while Marcus Hook, at 10 ft, averages March 30.
- Gardens in valleys and low spots, where cold air settles, often frost a week or more later in spring than the nearest station.
Frost dates at major airports
| Station | Last frost | Safer date | First frost | Season (days) |
|---|---|---|---|---|
| Allentown Intl Airport | Apr 20 | May 6 | Oct 24 | 184 |
| Altoona Blair Co Airport | Apr 23 | May 11 | Oct 21 | 177 |
| Avondale 2 N | Apr 19 | May 3 | Oct 26 | 189 |
| Bradford Rgnl Airport | May 18 | May 31 | Oct 1 | 136 |
| Clearfield Lawrence Airport | May 4 | May 22 | Oct 11 | 161 |
| Doylestown Airport | Apr 13 | Apr 27 | Oct 30 | 198 |
| Dubois Jefferson Co Airport | May 6 | May 23 | Oct 14 | 160 |
| Erie Intl Airport | Apr 26 | May 13 | Nov 4 | 192 |
| Harrisburg Cptl Cy Airport | Apr 9 | Apr 25 | Nov 1 | 205 |
| Johnstown Cambria Co Airport | Apr 29 | May 17 | Oct 21 | 176 |
| Lancaster Airport | Apr 18 | May 5 | Oct 25 | 186 |
| Middletown Harrisburg Intl Airport | Apr 9 | Apr 25 | Nov 2 | 206 |
| Mt Pocono Mountains Airport | May 6 | May 23 | Oct 8 | 154 |
| Philadelphia Intl Airport | Apr 2 | Apr 13 | Nov 10 | 224 |
| Philadelphia NE Airport | Apr 4 | Apr 17 | Nov 7 | 216 |
| Pittsburgh Allegheny Co Airport | Apr 18 | May 6 | Oct 28 | 193 |
| Pittsburgh Intl Airport | Apr 23 | May 12 | Oct 23 | 181 |
| Port Meadville Airport | Apr 30 | May 18 | Oct 23 | 175 |
| Pottstown Limerick Airport | Apr 20 | May 6 | Oct 23 | 186 |
| Reading Spaatz Fld | Apr 14 | Apr 30 | Oct 29 | 197 |
| Selinsgrove Penn Vly Airport | Apr 27 | May 12 | Oct 16 | 172 |
| Wilkes-Barre Intl Airport | Apr 23 | May 10 | Oct 20 | 178 |
| Williamsport | Apr 24 | May 11 | Oct 23 | 180 |
| Willow Grove Nas | Apr 11 | Apr 27 | Nov 1 | 205 |
| York Airport | Apr 27 | May 11 | Oct 18 | 174 |
All 160 weather stations in Pennsylvania
| Station | Elevation (ft) | Last frost | Safer date | First frost | Season (days) |
|---|---|---|---|---|---|
| Acmetonia Lock 3 | 748 | Apr 16 | May 4 | Nov 1 | 197 |
| Allentown Intl Airport | 390 | Apr 20 | May 6 | Oct 24 | 184 |
| Altoona 3 W | 1,320 | Apr 25 | May 11 | Oct 21 | 176 |
| Altoona 7 SW | 1,180 | Apr 25 | May 14 | Oct 20 | 177 |
| Altoona Blair Co Airport | 1,480 | Apr 23 | May 11 | Oct 21 | 177 |
| Alvin R Bush Dam | 930 | Apr 29 | May 14 | Oct 21 | 177 |
| Avondale 2 N | 400 | Apr 19 | May 3 | Oct 26 | 189 |
| Bear Gap | 1,015 | Apr 27 | May 15 | Oct 20 | 172 |
| Beaver Falls 1 NE | 760 | Apr 27 | May 16 | Oct 25 | 178 |
| Benton 3 NE | 1,095 | May 4 | May 19 | Oct 11 | 159 |
| Biglerville | 720 | Apr 15 | May 4 | Oct 27 | 194 |
| Bloserville 1 N | 700 | Apr 18 | May 8 | Oct 26 | 191 |
| Blue Marsh Lake | 350 | Apr 26 | May 12 | Oct 19 | 176 |
| Braddock Lock 2 | 730 | Apr 5 | Apr 22 | Nov 10 | 219 |
| Bradford 4SW Rsch 5 | 1,660 | May 18 | May 31 | Oct 4 | 140 |
| Bradford Rgnl Airport | 2,117 | May 18 | May 31 | Oct 1 | 136 |
| Bucksville | 387 | Apr 29 | May 15 | Oct 16 | 170 |
| Butler 2 SW | 1,000 | May 7 | May 23 | Oct 14 | 159 |
| Canton | 1,140 | May 16 | May 29 | Oct 2 | 139 |
| Carlisle Wtp | 430 | Apr 23 | May 9 | Oct 18 | 177 |
| Cashtown 1S | 710 | Apr 28 | May 16 | Oct 17 | 170 |
| Chalk Hill 2 ENE | 1,980 | May 19 | Jun 2 | Oct 1 | 135 |
| Chambersburg 1 ESE | 640 | Apr 18 | May 5 | Oct 25 | 188 |
| Chandlers Valley 1SE | 1,490 | May 22 | Jun 5 | Sep 30 | 131 |
| Charleroi Lock 4 | 749 | Apr 13 | May 5 | Nov 5 | 205 |
| Clarence | 1,390 | May 21 | Jun 1 | Sep 27 | 130 |
| Clarion 3 SW | 1,040 | May 9 | May 24 | Oct 11 | 154 |
| Clearfield Lawrence Airport | 1,516 | May 4 | May 22 | Oct 11 | 161 |
| Clermont 1 NW | 2,080 | May 15 | May 31 | Oct 3 | 140 |
| Coatesville 2 W | 640 | Apr 19 | May 4 | Oct 25 | 190 |
| Confluence 1 SW Dam | 1,490 | Apr 30 | May 18 | Oct 18 | 171 |
| Connellsville 2 SSW | 900 | Apr 22 | May 11 | Oct 27 | 187 |
| Cooksburg 2 NW | 1,450 | May 13 | May 28 | Oct 7 | 143 |
| Coudersport 1 SW | 1,650 | May 22 | Jun 6 | Oct 1 | 130 |
| Coudersport 7SE | 2,150 | May 14 | May 30 | Oct 4 | 143 |
| Cowanesque Dam | 1,150 | May 9 | May 25 | Oct 12 | 155 |
| Dehart Dam | 537 | May 1 | May 20 | Oct 16 | 168 |
| Donegal 2 NW | 1,800 | Apr 30 | May 18 | Oct 17 | 170 |
| Donora 1 SW | 762 | Apr 27 | May 15 | Oct 22 | 177 |
| Doylestown Airport | 394 | Apr 13 | Apr 27 | Oct 30 | 198 |
| Dubois Jefferson Co Airport | 1,814 | May 6 | May 23 | Oct 14 | 160 |
| Dushore | 1,530 | May 14 | May 27 | Oct 2 | 143 |
| E Stroudsburg | 471 | May 1 | May 18 | Oct 12 | 163 |
| Ebensburg Sewage Plt | 1,940 | May 17 | Jun 1 | Oct 2 | 136 |
| Eisenhower Nhs | 540 | Apr 24 | May 10 | Oct 21 | 180 |
| Emporium | 1,040 | May 7 | May 23 | Oct 15 | 160 |
| Emsworth L/d Ohio Rvr | 717 | Apr 24 | May 11 | Oct 27 | 186 |
| Erie Intl Airport | 730 | Apr 26 | May 13 | Nov 4 | 192 |
| Everett | 1,000 | Apr 27 | May 16 | Oct 17 | 170 |
| Ford City 4 S Dam | 930 | May 4 | May 20 | Oct 16 | 164 |
| Francis E Walter Dam | 1,509 | May 7 | May 23 | Oct 6 | 153 |
| Franklin | 1,015 | May 2 | May 20 | Oct 23 | 171 |
| Glen Hazel 2 NE Dam | 1,720 | May 14 | May 29 | Oct 6 | 143 |
| Glenmoore | 500 | Apr 11 | Apr 29 | Nov 1 | 205 |
| Glenwillard Dashields L&d | 710 | Apr 8 | Apr 26 | Nov 8 | 212 |
| Grampian 1E | 1,510 | May 4 | May 21 | Oct 13 | 160 |
| Graterford 1 E | 279 | Apr 24 | May 9 | Oct 15 | 173 |
| Grays Landing | 800 | Apr 28 | May 14 | Oct 21 | 175 |
| Hamburg | 369 | Apr 16 | May 3 | Oct 25 | 189 |
| Hanover 4 SW | 558 | Apr 24 | May 11 | Oct 20 | 177 |
| Harrisburg 1 NE | 420 | Apr 15 | May 2 | Oct 23 | 189 |
| Harrisburg Cptl Cy Airport | 340 | Apr 9 | Apr 25 | Nov 1 | 205 |
| Hawley 1 E | 890 | May 10 | May 26 | Oct 4 | 146 |
| Hidden Valley | 2,876 | May 2 | May 18 | Oct 17 | 168 |
| Hopewell Morgantown | 550 | Apr 16 | Apr 30 | Oct 27 | 193 |
| Indiana 3 SE | 1,102 | May 8 | May 24 | Oct 13 | 157 |
| Jamestown 2 NW | 1,040 | May 4 | May 22 | Oct 14 | 161 |
| Johnstown Cambria Co Airport | 2,284 | Apr 29 | May 17 | Oct 21 | 176 |
| Kane 1NNE | 1,750 | May 24 | Jun 7 | Sep 28 | 126 |
| Lancaster 2NE Fltr Plt | 270 | Apr 19 | May 7 | Oct 24 | 186 |
| Lancaster Airport | 403 | Apr 18 | May 5 | Oct 25 | 186 |
| Landisville 2 NW | 360 | Apr 30 | May 13 | Oct 10 | 162 |
| Laporte | 1,966 | May 6 | May 22 | Oct 7 | 154 |
| Laurel Mtn | 2,760 | Apr 26 | May 13 | Oct 17 | 172 |
| Laurel Summit | 2,730 | May 6 | May 23 | Oct 12 | 159 |
| Laurelton Ctr | 800 | Apr 25 | May 11 | Oct 19 | 175 |
| Lebanon 2 W | 450 | Apr 20 | May 7 | Oct 25 | 185 |
| Lehighton 1SSW | 455 | Apr 21 | May 9 | Oct 23 | 184 |
| Lewisburg | 500 | Apr 26 | May 11 | Oct 20 | 176 |
| Lewistown | 460 | Apr 21 | May 9 | Oct 24 | 185 |
| Linesville 1 S | 1,030 | Apr 30 | May 17 | Oct 23 | 177 |
| Lock Haven Sewage Plt | 566 | Apr 30 | May 15 | Oct 20 | 173 |
| Loyalhanna Lake | 990 | May 2 | May 18 | Oct 14 | 163 |
| Mahanoy City 2 N | 1,710 | Apr 30 | May 18 | Oct 22 | 175 |
| Marcus Hook | 10 | Mar 30 | Apr 9 | Nov 16 | 230 |
| Matamoras | 459 | May 2 | May 17 | Oct 12 | 164 |
| Mckeesport | 740 | May 2 | May 20 | Oct 20 | 170 |
| Mercer | 1,220 | May 15 | Jun 1 | Oct 3 | 140 |
| Meyersdale 2 SSW | 2,000 | May 12 | May 28 | Oct 5 | 146 |
| Middletown Harrisburg Intl Airport | 312 | Apr 9 | Apr 25 | Nov 2 | 206 |
| Milanville | 760 | May 3 | May 21 | Oct 9 | 156 |
| Millheim | 1,120 | May 5 | May 24 | Oct 6 | 153 |
| Montgomery L&d | 690 | Apr 28 | May 15 | Oct 26 | 178 |
| Montrose | 1,420 | May 14 | May 28 | Oct 2 | 141 |
| Moon Twp | 1,172 | Apr 28 | May 15 | Oct 18 | 172 |
| Mt Pleasant | 1,003 | May 1 | May 19 | Oct 13 | 164 |
| Mt Pocono Mountains Airport | 1,916 | May 6 | May 23 | Oct 8 | 154 |
| Murrysville 2 SW | 860 | Apr 22 | May 12 | Oct 25 | 186 |
| Natrona Lock 4 | 760 | Apr 16 | May 2 | Nov 2 | 199 |
| Neshaminy Falls | 40 | Apr 21 | May 7 | Oct 25 | 185 |
| New Castle 1 N | 825 | Apr 30 | May 19 | Oct 23 | 175 |
| New Holland 2 SE | 605 | Apr 14 | Apr 30 | Nov 1 | 198 |
| Norristown | 62 | Apr 8 | Apr 23 | Oct 31 | 203 |
| Octoraro Lake | 260 | Apr 26 | May 10 | Oct 22 | 179 |
| Oswayo 1 ENE | 1,710 | May 20 | Jun 2 | Sep 29 | 130 |
| Phila Franklin Inst | 60 | Mar 30 | Apr 12 | Nov 17 | 232 |
| Philadelphia Intl Airport | 10 | Apr 2 | Apr 13 | Nov 10 | 224 |
| Philadelphia NE Airport | 100 | Apr 4 | Apr 17 | Nov 7 | 216 |
| Philipsburg 2 S | 1,720 | May 13 | May 29 | Oct 1 | 142 |
| Phoenixville 1 E | 85 | Apr 18 | May 4 | Oct 27 | 192 |
| Pittsburgh Allegheny Co Airport | 1,248 | Apr 18 | May 6 | Oct 28 | 193 |
| Pittsburgh Intl Airport | 1,203 | Apr 23 | May 12 | Oct 23 | 181 |
| Pleasant Mt 1 W | 1,800 | May 14 | May 29 | Oct 1 | 140 |
| Port Allegany | 1,475 | May 15 | May 29 | Oct 6 | 144 |
| Port Meadville Airport | 1,400 | Apr 30 | May 18 | Oct 23 | 175 |
| Pottstown Limerick Airport | 291 | Apr 20 | May 6 | Oct 23 | 186 |
| Prince Gallitzin Sp | 1,520 | May 10 | May 28 | Oct 5 | 149 |
| Pt Marion Lock 8 | 810 | Apr 30 | May 17 | Oct 23 | 177 |
| Putneyville 2 SE Dam | 1,280 | May 10 | May 28 | Oct 12 | 155 |
| Raystown Hq | 995 | Apr 19 | May 8 | Oct 29 | 194 |
| Raystown Lake 2 | 1,000 | Apr 19 | May 7 | Oct 28 | 191 |
| Reading 4 NNW | 360 | Apr 10 | Apr 26 | Oct 31 | 202 |
| Reading Spaatz Fld | 341 | Apr 14 | Apr 30 | Oct 29 | 197 |
| Rector 3 SSW | 1,330 | May 5 | May 22 | Oct 6 | 152 |
| Renovo | 660 | Apr 30 | May 17 | Oct 22 | 173 |
| Ridgway | 1,360 | May 13 | May 28 | Oct 11 | 150 |
| Rodale Rsch Ctr | 550 | Apr 26 | May 13 | Oct 14 | 171 |
| S Mtn | 1,520 | Apr 27 | May 14 | Oct 20 | 177 |
| Safe Harbor Dam | 195 | Apr 1 | Apr 13 | Nov 10 | 221 |
| Salina 3 W | 1,109 | Apr 29 | May 17 | Oct 20 | 171 |
| Schenley Lock 5 | 783 | Apr 21 | May 9 | Oct 30 | 190 |
| Selinsgrove 2 S | 420 | Apr 25 | May 10 | Oct 22 | 178 |
| Selinsgrove Penn Vly Airport | 444 | Apr 27 | May 12 | Oct 16 | 172 |
| Sellersville | 302 | Apr 26 | May 12 | Oct 17 | 175 |
| Shawnee Sp | 1,275 | May 4 | May 21 | Oct 10 | 158 |
| Shippensburg | 680 | Apr 19 | May 6 | Oct 24 | 188 |
| Slippery Rock 1 SSW | 1,260 | May 7 | May 25 | Oct 14 | 158 |
| Springboro 3 WNW | 1,005 | May 8 | May 23 | Oct 16 | 160 |
| Springtown 1 NNE | 860 | Apr 21 | May 6 | Oct 22 | 184 |
| State College | 1,170 | Apr 20 | May 6 | Oct 26 | 187 |
| Stevenson Dam | 932 | May 10 | May 27 | Oct 16 | 157 |
| Sunbury | 575 | Apr 30 | May 19 | Oct 13 | 166 |
| Tioga Hammond Dam | 1,230 | May 6 | May 23 | Oct 10 | 158 |
| Tionesta 2 SE Lake | 1,200 | May 1 | May 18 | Oct 25 | 176 |
| Titusville Wtr Wks | 1,220 | May 12 | May 28 | Oct 10 | 149 |
| Towanda 1 S | 760 | May 2 | May 16 | Oct 15 | 165 |
| Union City Filtration Plant | 1,400 | May 7 | May 24 | Oct 10 | 155 |
| Uniontown 1 NE | 956 | Apr 30 | May 18 | Oct 18 | 171 |
| W Chester 2 NW | 375 | Apr 26 | May 11 | Oct 18 | 174 |
| Warren | 1,210 | May 4 | May 22 | Oct 21 | 168 |
| Washington 3 NE | 1,300 | Apr 24 | May 18 | Oct 23 | 181 |
| Waynesburg 1 E | 940 | May 3 | May 21 | Oct 15 | 164 |
| Wellsboro 4 SW | 1,818 | May 10 | May 26 | Oct 5 | 148 |
| Wilkes-Barre Intl Airport | 930 | Apr 23 | May 10 | Oct 20 | 178 |
| Williamsport | 520 | Apr 24 | May 11 | Oct 23 | 180 |
| Williamsport 2 | 525 | Apr 25 | May 12 | Oct 24 | 181 |
| Willow Grove Nas | 361 | Apr 11 | Apr 27 | Nov 1 | 205 |
| Wolfsburg | 1,185 | Apr 29 | May 18 | Oct 13 | 167 |
| York 3 SSW Pump Stn | 390 | Apr 26 | May 13 | Oct 19 | 177 |
| York Airport | 486 | Apr 27 | May 11 | Oct 18 | 174 |
No station matches that name. Try a nearby town, or look up your ZIP code above.
Last frost and first frost are averages (a 50% chance of frost later in spring or earlier in fall). Safer date is the spring date with only a 10% chance of a later frost.
Using these dates
Plant hardy crops like peas and spinach several weeks before your last frost, and tender crops like tomatoes and peppers after it, once nights stay above 50°F. The Seed Starting Calculator turns your frost date into sowing and planting dates, and When to Plant Tomatoes explains the timing in detail.
Data: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, 32°F threshold.
Frost dates in other states
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