Frost dates

Frost dates in Pennsylvania


Typical last spring frost and first fall frost for 160 weather stations across Pennsylvania, from NOAA’s 1991–2020 climate normals.

Last spring frost

Apr 14 – May 14

Typical across Pennsylvania (middle: Apr 28)

First fall frost

Oct 4 – Oct 31

Typical across Pennsylvania (middle: Oct 19)

Your own yard can differ by weeks from the nearest town. Get frost dates for your exact spot →

By town

StationLast spring frostFirst fall frostFrost-free days
Acmetonia Lock 3Apr 16Nov 1199
Allentown International AirportApr 20Oct 24187
Altoona 3 WApr 25Oct 21179
Altoona 7 SWApr 25Oct 20178
Altoona Blair County AirportApr 23Oct 21181
Alvin R Bush DamApr 29Oct 21175
Avondale 2 NApr 19Oct 26190
Bear GapApr 27Oct 20176
Beaver Falls 1 NEApr 27Oct 25181
Benton 3 NEMay 4Oct 11160
BiglervilleApr 15Oct 27195
Bloserville 1 NApr 18Oct 26191
Blue Marsh LakeApr 26Oct 19176
Braddock Lock 2Apr 5Nov 10219
Bradford 4 SW Rsch 5May 18Oct 4139
Bradford Regional AirportMay 18Oct 1136
BucksvilleApr 29Oct 16170
Butler 2 SWMay 7Oct 14160
CantonMay 16Oct 2139
Carlisle WtpApr 23Oct 18178
Cashtown 1 SApr 28Oct 17172
Chalk Hill 2 ENEMay 19Oct 1135
Chambersburg 1 ESEApr 18Oct 25190
Chandlers Valley 1 SEMay 22Sep 30131
Charleroi Lock 4Apr 13Nov 5206
ClarenceMay 21Sep 27129
Clarion 3 SWMay 9Oct 11155
Clearfield Lawrence AirportMay 4Oct 11160
Clermont 1 NWMay 15Oct 3141
Coatesville 2 WApr 19Oct 25189
Confluence 1 SW DamApr 30Oct 18171
Connellsville 2 SSWApr 22Oct 27188
Cooksburg 2 NWMay 13Oct 7147
Coudersport 1 SWMay 22Oct 1132
Coudersport 7 SEMay 14Oct 4143
Cowanesque DamMay 9Oct 12156
Dehart DamMay 1Oct 16168
Donegal 2 NWApr 30Oct 17170
Donora 1 SWApr 27Oct 22178
Doylestown AirportApr 13Oct 30200
Dubois Jefferson County AirportMay 6Oct 14161
DushoreMay 14Oct 2141
E StroudsburgMay 1Oct 12164
Ebensburg Sewage PltMay 17Oct 2138
Eisenhower NhsApr 24Oct 21180
EmporiumMay 7Oct 15161
Emsworth L/D Ohio RvrApr 24Oct 27186
Erie International AirportApr 26Nov 4192
EverettApr 27Oct 17173
Ford City 4 S DamMay 4Oct 16165
Francis E Walter DamMay 7Oct 6152
FranklinMay 2Oct 23174
Glen Hazel 2 NE DamMay 14Oct 6145
GlenmooreApr 11Nov 1204
Glenwillard Dashields L&DApr 8Nov 8214
Grampian 1 EMay 4Oct 13162
Graterford 1 EApr 24Oct 15174
Grays LandingApr 28Oct 21176
HamburgApr 16Oct 25192
Hanover 4 SWApr 24Oct 20179
Harrisburg 1 NEApr 15Oct 23191
Harrisburg Cptl Cy AirportApr 9Nov 1206
Hawley 1 EMay 10Oct 4147
Hidden ValleyMay 2Oct 17168
Hopewell MorgantownApr 16Oct 27194
Indiana 3 SEMay 8Oct 13158
Jamestown 2 NWMay 4Oct 14163
Johnstown Cambria County AirportApr 29Oct 21175
Kane 1 NNEMay 24Sep 28127
Lancaster 2 NE Fltr PltApr 19Oct 24188
Lancaster AirportApr 18Oct 25190
Landisville 2 NWApr 30Oct 10163
LaporteMay 6Oct 7154
Laurel MountainApr 26Oct 17174
Laurel SummitMay 6Oct 12159
Laurelton CtrApr 25Oct 19177
Lebanon 2 WApr 20Oct 25188
Lehighton 1 SSWApr 21Oct 23185
LewisburgApr 26Oct 20177
LewistownApr 21Oct 24186
Linesville 1 SApr 30Oct 23176
Lock Haven Sewage PltApr 30Oct 20173
Loyalhanna LakeMay 2Oct 14165
Mahanoy City 2 NApr 30Oct 22175
Marcus HookMar 30Nov 16231
MatamorasMay 2Oct 12163
MckeesportMay 2Oct 20171
MercerMay 15Oct 3141
Meyersdale 2 SSWMay 12Oct 5146
Middletown Harrisburg International AirportApr 9Nov 2207
MilanvilleMay 3Oct 9159
MillheimMay 5Oct 6154
Montgomery L&DApr 28Oct 26181
MontroseMay 14Oct 2141
Moon TwpApr 28Oct 18173
Mount PleasantMay 1Oct 13165
Mount Pocono Mountains AirportMay 6Oct 8155
Murrysville 2 SWApr 22Oct 25186
Natrona Lock 4Apr 16Nov 2200
Neshaminy FallsApr 21Oct 25187
New Castle 1 NApr 30Oct 23176
New Holland 2 SEApr 14Nov 1201
NorristownApr 8Oct 31206
Octoraro LakeApr 26Oct 22179
Oswayo 1 ENEMay 20Sep 29132
Phila Franklin InstMar 30Nov 17232
Philadelphia International AirportApr 2Nov 10222
Philadelphia NE AirportApr 4Nov 7217
Philipsburg 2 SMay 13Oct 1141
Phoenixville 1 EApr 18Oct 27192
Pittsburgh Allegheny County AirportApr 18Oct 28193
Pittsburgh International AirportApr 23Oct 23183
Pleasant Mount 1 WMay 14Oct 1140
Port AlleganyMay 15Oct 6144
Port Meadville AirportApr 30Oct 23176
Pottstown Limerick AirportApr 20Oct 23186
Prince Gallitzin SpMay 10Oct 5148
Pt Marion Lock 8Apr 30Oct 23176
Putneyville 2 SE DamMay 10Oct 12155
Raystown HQApr 19Oct 29193
Raystown Lake 2Apr 19Oct 28192
Reading 4 NNWApr 10Oct 31204
Reading Spaatz FieldApr 14Oct 29198
Rector 3 SSWMay 5Oct 6154
RenovoApr 30Oct 22175
RidgwayMay 13Oct 11151
Rodale Rsch CtrApr 26Oct 14171
S MountainApr 27Oct 20176
Safe Harbor DamApr 1Nov 10223
Salina 3 WApr 29Oct 20174
Schenley Lock 5Apr 21Oct 30192
Selinsgrove 2 SApr 25Oct 22180
Selinsgrove Penn Vly AirportApr 27Oct 16172
SellersvilleApr 26Oct 17174
Shawnee SpMay 4Oct 10159
ShippensburgApr 19Oct 24188
Slippery Rock 1 SSWMay 7Oct 14160
Springboro 3 WNWMay 8Oct 16161
Springtown 1 NNEApr 21Oct 22184
State CollegeApr 20Oct 26189
Stevenson DamMay 10Oct 16159
SunburyApr 30Oct 13166
Tioga Hammond DamMay 6Oct 10157
Tionesta 2 SE LakeMay 1Oct 25177
Titusville Wtr WksMay 12Oct 10151
Towanda 1 SMay 2Oct 15166
Union City Filtration PlantMay 7Oct 10156
Uniontown 1 NEApr 30Oct 18171
W Chester 2 NWApr 26Oct 18175
WarrenMay 4Oct 21170
Washington 3 NEApr 24Oct 23182
Waynesburg 1 EMay 3Oct 15165
Wellsboro 4 SWMay 10Oct 5148
Wilkes-Barre International AirportApr 23Oct 20180
WilliamsportApr 24Oct 23182
Williamsport 2Apr 25Oct 24182
Willow Grove NASApr 11Nov 1204
WolfsburgApr 29Oct 13167
York 3 SSW Pump StationApr 26Oct 19176
York AirportApr 27Oct 18174

Each date is the median: in half of years the frost comes earlier, in half later. Frost here means a low of 32°F or colder at the station. Low spots and valleys often frost a week or two earlier than these dates; hillsides and city centers later.

Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. The Field almanac also shows how often frost comes early or late, and a reanalysis reading for your exact location.

Frost dates for every state