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Pennsylvania frost dates

Across 160 NOAA climate stations in Pennsylvania, the median last spring frost (32°F) ranges from Mar 30 at Marcus Hook to May 24 at Kane 1NNE; the typical station sees its last frost around Apr 29 and its first fall frost around Oct 20.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Acmetonia Lock 3748 ftApr 16May 4Nov 1Oct 18197 days
Allentown Intl AP390 ftApr 20May 6Oct 24Oct 8184 days
Altoona 3 W1,320 ftApr 25May 11Oct 21Oct 5176 days
Altoona 7 Sw1,180 ftApr 25May 14Oct 20Oct 6177 days
Altoona Blair Co AP1,480 ftApr 23May 11Oct 21Oct 5177 days
Alvin R Bush Dam930 ftApr 29May 14Oct 21Oct 6177 days
Avondale 2 N400 ftApr 19May 3Oct 26Oct 11189 days
Bear Gap1,015 ftApr 27May 15Oct 20Oct 4172 days
Beaver Falls 1 Ne760 ftApr 27May 16Oct 25Oct 7178 days
Benton 3 Ne1,095 ftMay 4May 19Oct 11Sep 29159 days
Biglerville720 ftApr 15May 4Oct 27Oct 11194 days
Bloserville 1 N700 ftApr 18May 8Oct 26Oct 11191 days
Blue Marsh Lake350 ftApr 26May 12Oct 19Oct 5176 days
Braddock Lock 2730 ftApr 5Apr 22Nov 10Oct 28219 days
Bradford 4SW Rsch 51,660 ftMay 18May 31Oct 4Sep 21140 days
Bradford Rgnl AP2,117 ftMay 18May 31Oct 1Sep 18136 days
Bucksville387 ftApr 29May 15Oct 16Oct 4170 days
Butler 2 Sw1,000 ftMay 7May 23Oct 14Oct 1159 days
Canton1,140 ftMay 16May 29Oct 2Sep 18139 days
Carlisle Wtp430 ftApr 23May 9Oct 18Oct 4177 days
Cashtown 1S710 ftApr 28May 16Oct 17Oct 4170 days
Chalk Hill 2 Ene1,980 ftMay 19Jun 2Oct 1Sep 18135 days
Chambersburg 1 Ese640 ftApr 18May 5Oct 25Oct 10188 days
Chandlers Valley 1SE1,490 ftMay 22Jun 5Sep 30Sep 16131 days
Charleroi Lock 4749 ftApr 13May 5Nov 5Oct 25205 days
Clarence1,390 ftMay 21Jun 1Sep 27Sep 12130 days
Clarion 3 Sw1,040 ftMay 9May 24Oct 11Sep 30154 days
Clearfield Lawrence AP1,516 ftMay 4May 22Oct 11Sep 29161 days
Clermont 1 Nw2,080 ftMay 15May 31Oct 3Sep 21140 days
Coatesville 2 W640 ftApr 19May 4Oct 25Oct 11190 days
Confluence 1 Sw Dam1,490 ftApr 30May 18Oct 18Oct 4171 days
Connellsville 2 Ssw900 ftApr 22May 11Oct 27Oct 14187 days
Cooksburg 2 Nw1,450 ftMay 13May 28Oct 7Sep 27143 days
Coudersport 1 Sw1,650 ftMay 22Jun 6Oct 1Sep 19130 days
Coudersport 7SE2,150 ftMay 14May 30Oct 4Sep 21143 days
Cowanesque Dam1,150 ftMay 9May 25Oct 12Sep 29155 days
Dehart Dam537 ftMay 1May 20Oct 16Oct 3168 days
Donegal 2 Nw1,800 ftApr 30May 18Oct 17Oct 3170 days
Donora 1 Sw762 ftApr 27May 15Oct 22Oct 8177 days
Doylestown AP394 ftApr 13Apr 27Oct 30Oct 15198 days
Dubois Jefferson Co AP1,814 ftMay 6May 23Oct 14Sep 29160 days
Dushore1,530 ftMay 14May 27Oct 2Sep 20143 days
E Stroudsburg471 ftMay 1May 18Oct 12Oct 1163 days
Ebensburg Sewage Plt1,940 ftMay 17Jun 1Oct 2Sep 19136 days
Eisenhower Nhs540 ftApr 24May 10Oct 21Oct 6180 days
Emporium1,040 ftMay 7May 23Oct 15Oct 1160 days
Emsworth L/D Ohio Rvr717 ftApr 24May 11Oct 27Oct 13186 days
Erie Intl AP730 ftApr 26May 13Nov 4Oct 21192 days
Everett1,000 ftApr 27May 16Oct 17Oct 3170 days
Ford City 4 S Dam930 ftMay 4May 20Oct 16Oct 2164 days
Francis E Walter Dam1,509 ftMay 7May 23Oct 6Sep 22153 days
Franklin1,015 ftMay 2May 20Oct 23Oct 8171 days
Glen Hazel 2 Ne Dam1,720 ftMay 14May 29Oct 6Sep 24143 days
Glenmoore500 ftApr 11Apr 29Nov 1Oct 16205 days
Glenwillard Dashields L&D710 ftApr 8Apr 26Nov 8Oct 27212 days
Grampian 1E1,510 ftMay 4May 21Oct 13Sep 30160 days
Graterford 1 E279 ftApr 24May 9Oct 15Oct 1173 days
Grays Landing800 ftApr 28May 14Oct 21Oct 9175 days
Hamburg369 ftApr 16May 3Oct 25Oct 9189 days
Hanover 4 Sw558 ftApr 24May 11Oct 20Oct 6177 days
Harrisburg 1 Ne420 ftApr 15May 2Oct 23Oct 7189 days
Harrisburg Cptl Cy AP340 ftApr 9Apr 25Nov 1Oct 16205 days
Hawley 1 E890 ftMay 10May 26Oct 4Sep 21146 days
Hidden Valley2,876 ftMay 2May 18Oct 17Oct 5168 days
Hopewell Morgantown550 ftApr 16Apr 30Oct 27Oct 11193 days
Indiana 3 Se1,102 ftMay 8May 24Oct 13Oct 1157 days
Jamestown 2 Nw1,040 ftMay 4May 22Oct 14Oct 1161 days
Johnstown Cambria Co AP2,284 ftApr 29May 17Oct 21Oct 5176 days
Kane 1NNE1,750 ftMay 24Jun 7Sep 28Sep 11126 days
Lancaster 2NE Fltr Plt270 ftApr 19May 7Oct 24Oct 9186 days
Lancaster AP403 ftApr 18May 5Oct 25Oct 10186 days
Landisville 2 Nw360 ftApr 30May 13Oct 10Sep 29162 days
Laporte1,966 ftMay 6May 22Oct 7Sep 24154 days
Laurel Mtn2,760 ftApr 26May 13Oct 17Oct 4172 days
Laurel Summit2,730 ftMay 6May 23Oct 12Oct 1159 days
Laurelton Ctr800 ftApr 25May 11Oct 19Oct 4175 days
Lebanon 2 W450 ftApr 20May 7Oct 25Oct 10185 days
Lehighton 1SSW455 ftApr 21May 9Oct 23Oct 7184 days
Lewisburg500 ftApr 26May 11Oct 20Oct 5176 days
Lewistown460 ftApr 21May 9Oct 24Oct 7185 days
Linesville 1 S1,030 ftApr 30May 17Oct 23Oct 6177 days
Lock Haven Sewage Plt566 ftApr 30May 15Oct 20Oct 5173 days
Loyalhanna Lake990 ftMay 2May 18Oct 14Oct 2163 days
Mahanoy City 2 N1,710 ftApr 30May 18Oct 22Oct 7175 days
Marcus Hook10 ftMar 30Apr 9Nov 16Nov 2230 days
Matamoras459 ftMay 2May 17Oct 12Oct 1164 days
Mckeesport740 ftMay 2May 20Oct 20Oct 1170 days
Mercer1,220 ftMay 15Jun 1Oct 3Sep 19140 days
Meyersdale 2 Ssw2,000 ftMay 12May 28Oct 5Sep 24146 days
Middletown Harrisburg Intl AP312 ftApr 9Apr 25Nov 2Oct 18206 days
Milanville760 ftMay 3May 21Oct 9Sep 27156 days
Millheim1,120 ftMay 5May 24Oct 6Sep 25153 days
Montgomery L&D690 ftApr 28May 15Oct 26Oct 9178 days
Montrose1,420 ftMay 14May 28Oct 2Sep 20141 days
Moon Twp1,172 ftApr 28May 15Oct 18Oct 5172 days
Mt Pleasant1,003 ftMay 1May 19Oct 13Oct 3164 days
Mt Pocono Mountains AP1,916 ftMay 6May 23Oct 8Sep 27154 days
Murrysville 2 Sw860 ftApr 22May 12Oct 25Oct 10186 days
Natrona Lock 4760 ftApr 16May 2Nov 2Oct 20199 days
Neshaminy Falls40 ftApr 21May 7Oct 25Oct 11185 days
New Castle 1 N825 ftApr 30May 19Oct 23Oct 6175 days
New Holland 2 Se605 ftApr 14Apr 30Nov 1Oct 17198 days
Norristown62 ftApr 8Apr 23Oct 31Oct 14203 days
Octoraro Lake260 ftApr 26May 10Oct 22Oct 9179 days
Oswayo 1 Ene1,710 ftMay 20Jun 2Sep 29Sep 14130 days
Phila Franklin Inst60 ftMar 30Apr 12Nov 17Nov 4232 days
Philadelphia Intl AP10 ftApr 2Apr 13Nov 10Oct 30224 days
Philadelphia Ne AP100 ftApr 4Apr 17Nov 7Oct 24216 days
Philipsburg 2 S1,720 ftMay 13May 29Oct 1Sep 19142 days
Phoenixville 1 E85 ftApr 18May 4Oct 27Oct 12192 days
Pittsburgh Allegheny Co AP1,248 ftApr 18May 6Oct 28Oct 14193 days
Pittsburgh Intl AP1,203 ftApr 23May 12Oct 23Oct 9181 days
Pleasant Mt 1 W1,800 ftMay 14May 29Oct 1Sep 21140 days
Port Allegany1,475 ftMay 15May 29Oct 6Sep 25144 days
Port Meadville AP1,400 ftApr 30May 18Oct 23Oct 6175 days
Pottstown Limerick AP291 ftApr 20May 6Oct 23Oct 9186 days
Prince Gallitzin Sp1,520 ftMay 10May 28Oct 5Sep 24149 days
Pt Marion Lock 8810 ftApr 30May 17Oct 23Oct 9177 days
Putneyville 2 Se Dam1,280 ftMay 10May 28Oct 12Sep 30155 days
Raystown Hq995 ftApr 19May 8Oct 29Oct 13194 days
Raystown Lake 21,000 ftApr 19May 7Oct 28Oct 12191 days
Reading 4 Nnw360 ftApr 10Apr 26Oct 31Oct 14202 days
Reading Spaatz Fld341 ftApr 14Apr 30Oct 29Oct 13197 days
Rector 3 Ssw1,330 ftMay 5May 22Oct 6Sep 23152 days
Renovo660 ftApr 30May 17Oct 22Oct 6173 days
Ridgway1,360 ftMay 13May 28Oct 11Sep 28150 days
Rodale Rsch Ctr550 ftApr 26May 13Oct 14Oct 1171 days
S Mtn1,520 ftApr 27May 14Oct 20Oct 6177 days
Safe Harbor Dam195 ftApr 1Apr 13Nov 10Oct 28221 days
Salina 3 W1,109 ftApr 29May 17Oct 20Oct 5171 days
Schenley Lock 5783 ftApr 21May 9Oct 30Oct 15190 days
Selinsgrove 2 S420 ftApr 25May 10Oct 22Oct 7178 days
Selinsgrove Penn Vly AP444 ftApr 27May 12Oct 16Oct 3172 days
Sellersville302 ftApr 26May 12Oct 17Oct 5175 days
Shawnee Sp1,275 ftMay 4May 21Oct 10Sep 28158 days
Shippensburg680 ftApr 19May 6Oct 24Oct 9188 days
Slippery Rock 1 Ssw1,260 ftMay 7May 25Oct 14Oct 1158 days
Springboro 3 Wnw1,005 ftMay 8May 23Oct 16Oct 1160 days
Springtown 1 Nne860 ftApr 21May 6Oct 22Oct 7184 days
State College1,170 ftApr 20May 6Oct 26Oct 10187 days
Stevenson Dam932 ftMay 10May 27Oct 16Oct 2157 days
Sunbury575 ftApr 30May 19Oct 13Sep 30166 days
Tioga Hammond Dam1,230 ftMay 6May 23Oct 10Sep 30158 days
Tionesta 2 Se Lake1,200 ftMay 1May 18Oct 25Oct 8176 days
Titusville Wtr Wks1,220 ftMay 12May 28Oct 10Sep 25149 days
Towanda 1 S760 ftMay 2May 16Oct 15Oct 1165 days
Union City Filtration Plant1,400 ftMay 7May 24Oct 10Sep 29155 days
Uniontown 1 Ne956 ftApr 30May 18Oct 18Oct 5171 days
W Chester 2 Nw375 ftApr 26May 11Oct 18Oct 4174 days
Warren1,210 ftMay 4May 22Oct 21Oct 6168 days
Washington 3 Ne1,300 ftApr 24May 18Oct 23Oct 8181 days
Waynesburg 1 E940 ftMay 3May 21Oct 15Oct 2164 days
Wellsboro 4 Sw1,818 ftMay 10May 26Oct 5Sep 23148 days
Wilkes-Barre Intl AP930 ftApr 23May 10Oct 20Oct 4178 days
Williamsport520 ftApr 24May 11Oct 23Oct 6180 days
Williamsport 2525 ftApr 25May 12Oct 24Oct 8181 days
Willow Grove Nas361 ftApr 11Apr 27Nov 1Oct 17205 days
Wolfsburg1,185 ftApr 29May 18Oct 13Sep 29167 days
York 3 Ssw Pump Stn390 ftApr 26May 13Oct 19Oct 5177 days
York AP486 ftApr 27May 11Oct 18Oct 4174 days
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