Last frost dates in Pennsylvania
160 NOAA weather stations in Pennsylvania have thirty years of frost records. The median station sees its last 32 °F night around Apr 28; across the state that ranges from Mar 30 to May 24, so pick the station nearest you rather than a state-wide figure.
| Plan sowing from this date | ||||||
|---|---|---|---|---|---|---|
| MARCUS HOOK | Mar 30 | Apr 9 | Mar 16 | Nov 16 | 230 | Plan sowing from this date → |
| PHILA FRANKLIN INST | Mar 30 | Apr 12 | Mar 15 | Nov 17 | 232 | Plan sowing from this date → |
| SAFE HARBOR DAM | Apr 1 | Apr 13 | Mar 18 | Nov 10 | 221 | Plan sowing from this date → |
| PHILADELPHIA INTL AP | Apr 2 | Apr 13 | Mar 19 | Nov 10 | 224 | Plan sowing from this date → |
| PHILADELPHIA NE AP | Apr 4 | Apr 17 | Mar 21 | Nov 7 | 216 | Plan sowing from this date → |
| BRADDOCK LOCK 2 | Apr 5 | Apr 22 | Mar 22 | Nov 10 | 219 | Plan sowing from this date → |
| GLENWILLARD DASHIELDS L&D | Apr 8 | Apr 26 | Mar 25 | Nov 8 | 212 | Plan sowing from this date → |
| NORRISTOWN | Apr 8 | Apr 23 | Mar 28 | Oct 31 | 203 | Plan sowing from this date → |
| HARRISBURG CPTL CY AP | Apr 9 | Apr 25 | Mar 27 | Nov 1 | 205 | Plan sowing from this date → |
| MIDDLETOWN HARRISBURG INTL AP | Apr 9 | Apr 25 | Mar 28 | Nov 2 | 206 | Plan sowing from this date → |
| READING 4 NNW | Apr 10 | Apr 26 | Mar 29 | Oct 31 | 202 | Plan sowing from this date → |
| GLENMOORE | Apr 11 | Apr 29 | Mar 28 | Nov 1 | 205 | Plan sowing from this date → |
| WILLOW GROVE NAS | Apr 11 | Apr 27 | Mar 29 | Nov 1 | 205 | Plan sowing from this date → |
| CHARLEROI LOCK 4 | Apr 13 | May 5 | Mar 29 | Nov 5 | 205 | Plan sowing from this date → |
| DOYLESTOWN AP | Apr 13 | Apr 27 | Apr 1 | Oct 30 | 198 | Plan sowing from this date → |
| NEW HOLLAND 2 SE | Apr 14 | Apr 30 | Apr 1 | Nov 1 | 198 | Plan sowing from this date → |
| READING SPAATZ FLD | Apr 14 | Apr 30 | Apr 1 | Oct 29 | 197 | Plan sowing from this date → |
| BIGLERVILLE | Apr 15 | May 4 | Apr 1 | Oct 27 | 194 | Plan sowing from this date → |
| HARRISBURG 1 NE | Apr 15 | May 2 | Apr 1 | Oct 23 | 189 | Plan sowing from this date → |
| ACMETONIA LOCK 3 | Apr 16 | May 4 | Mar 31 | Nov 1 | 197 | Plan sowing from this date → |
| HAMBURG | Apr 16 | May 3 | Apr 2 | Oct 25 | 189 | Plan sowing from this date → |
| HOPEWELL MORGANTOWN | Apr 16 | Apr 30 | Apr 3 | Oct 27 | 193 | Plan sowing from this date → |
| NATRONA LOCK 4 | Apr 16 | May 2 | Mar 31 | Nov 2 | 199 | Plan sowing from this date → |
| BLOSERVILLE 1 N | Apr 18 | May 8 | Apr 3 | Oct 26 | 191 | Plan sowing from this date → |
| CHAMBERSBURG 1 ESE | Apr 18 | May 5 | Apr 3 | Oct 25 | 188 | Plan sowing from this date → |
| LANCASTER AP | Apr 18 | May 5 | Apr 4 | Oct 25 | 186 | Plan sowing from this date → |
| PHOENIXVILLE 1 E | Apr 18 | May 4 | Apr 3 | Oct 27 | 192 | Plan sowing from this date → |
| PITTSBURGH ALLEGHENY CO AP | Apr 18 | May 6 | Apr 2 | Oct 28 | 193 | Plan sowing from this date → |
| AVONDALE 2 N | Apr 19 | May 3 | Apr 1 | Oct 26 | 189 | Plan sowing from this date → |
| COATESVILLE 2 W | Apr 19 | May 4 | Apr 3 | Oct 25 | 190 | Plan sowing from this date → |
| LANCASTER 2NE FLTR PLT | Apr 19 | May 7 | Apr 5 | Oct 24 | 186 | Plan sowing from this date → |
| RAYSTOWN HQ | Apr 19 | May 8 | Apr 4 | Oct 29 | 194 | Plan sowing from this date → |
| RAYSTOWN LAKE 2 | Apr 19 | May 7 | Apr 5 | Oct 28 | 191 | Plan sowing from this date → |
| SHIPPENSBURG | Apr 19 | May 6 | Apr 4 | Oct 24 | 188 | Plan sowing from this date → |
| ALLENTOWN INTL AP | Apr 20 | May 6 | Apr 6 | Oct 24 | 184 | Plan sowing from this date → |
| LEBANON 2 W | Apr 20 | May 7 | Apr 5 | Oct 25 | 185 | Plan sowing from this date → |
| POTTSTOWN LIMERICK AP | Apr 20 | May 6 | Apr 5 | Oct 23 | 186 | Plan sowing from this date → |
| STATE COLLEGE | Apr 20 | May 6 | Apr 7 | Oct 26 | 187 | Plan sowing from this date → |
| LEHIGHTON 1SSW | Apr 21 | May 9 | Apr 7 | Oct 23 | 184 | Plan sowing from this date → |
| LEWISTOWN | Apr 21 | May 9 | Apr 6 | Oct 24 | 185 | Plan sowing from this date → |
| NESHAMINY FALLS | Apr 21 | May 7 | Apr 6 | Oct 25 | 185 | Plan sowing from this date → |
| SCHENLEY LOCK 5 | Apr 21 | May 9 | Apr 6 | Oct 30 | 190 | Plan sowing from this date → |
| SPRINGTOWN 1 NNE | Apr 21 | May 6 | Apr 8 | Oct 22 | 184 | Plan sowing from this date → |
| CONNELLSVILLE 2 SSW | Apr 22 | May 11 | Apr 6 | Oct 27 | 187 | Plan sowing from this date → |
| MURRYSVILLE 2 SW | Apr 22 | May 12 | Apr 7 | Oct 25 | 186 | Plan sowing from this date → |
| ALTOONA BLAIR CO AP | Apr 23 | May 11 | Apr 8 | Oct 21 | 177 | Plan sowing from this date → |
| CARLISLE WTP | Apr 23 | May 9 | Apr 9 | Oct 18 | 177 | Plan sowing from this date → |
| PITTSBURGH INTL AP | Apr 23 | May 12 | Apr 9 | Oct 23 | 181 | Plan sowing from this date → |
| WILKES-BARRE INTL AP | Apr 23 | May 10 | Apr 9 | Oct 20 | 178 | Plan sowing from this date → |
| EISENHOWER NHS | Apr 24 | May 10 | Apr 7 | Oct 21 | 180 | Plan sowing from this date → |
| EMSWORTH L/D OHIO RVR | Apr 24 | May 11 | Apr 9 | Oct 27 | 186 | Plan sowing from this date → |
| GRATERFORD 1 E | Apr 24 | May 9 | Apr 10 | Oct 15 | 173 | Plan sowing from this date → |
| HANOVER 4 SW | Apr 24 | May 11 | Apr 9 | Oct 20 | 177 | Plan sowing from this date → |
| WASHINGTON 3 NE | Apr 24 | May 18 | Apr 8 | Oct 23 | 181 | Plan sowing from this date → |
| WILLIAMSPORT | Apr 24 | May 11 | Apr 12 | Oct 23 | 180 | Plan sowing from this date → |
| ALTOONA 3 W | Apr 25 | May 11 | Apr 10 | Oct 21 | 176 | Plan sowing from this date → |
| ALTOONA 7 SW | Apr 25 | May 14 | Apr 10 | Oct 20 | 177 | Plan sowing from this date → |
| LAURELTON CTR | Apr 25 | May 11 | Apr 12 | Oct 19 | 175 | Plan sowing from this date → |
| SELINSGROVE 2 S | Apr 25 | May 10 | Apr 9 | Oct 22 | 178 | Plan sowing from this date → |
| WILLIAMSPORT 2 | Apr 25 | May 12 | Apr 10 | Oct 24 | 181 | Plan sowing from this date → |
| BLUE MARSH LAKE | Apr 26 | May 12 | Apr 11 | Oct 19 | 176 | Plan sowing from this date → |
| ERIE INTL AP | Apr 26 | May 13 | Apr 10 | Nov 4 | 192 | Plan sowing from this date → |
| LAUREL MTN | Apr 26 | May 13 | Apr 13 | Oct 17 | 172 | Plan sowing from this date → |
| LEWISBURG | Apr 26 | May 11 | Apr 13 | Oct 20 | 176 | Plan sowing from this date → |
| OCTORARO LAKE | Apr 26 | May 10 | Apr 9 | Oct 22 | 179 | Plan sowing from this date → |
| RODALE RSCH CTR | Apr 26 | May 13 | Apr 10 | Oct 14 | 171 | Plan sowing from this date → |
| SELLERSVILLE | Apr 26 | May 12 | Apr 12 | Oct 17 | 175 | Plan sowing from this date → |
| W CHESTER 2 NW | Apr 26 | May 11 | Apr 10 | Oct 18 | 174 | Plan sowing from this date → |
| YORK 3 SSW PUMP STN | Apr 26 | May 13 | Apr 7 | Oct 19 | 177 | Plan sowing from this date → |
| BEAR GAP | Apr 27 | May 15 | Apr 12 | Oct 20 | 172 | Plan sowing from this date → |
| BEAVER FALLS 1 NE | Apr 27 | May 16 | Apr 15 | Oct 25 | 178 | Plan sowing from this date → |
| DONORA 1 SW | Apr 27 | May 15 | Apr 11 | Oct 22 | 177 | Plan sowing from this date → |
| EVERETT | Apr 27 | May 16 | Apr 12 | Oct 17 | 170 | Plan sowing from this date → |
| S MTN | Apr 27 | May 14 | Apr 13 | Oct 20 | 177 | Plan sowing from this date → |
| SELINSGROVE PENN VLY AP | Apr 27 | May 12 | Apr 13 | Oct 16 | 172 | Plan sowing from this date → |
| YORK AP | Apr 27 | May 11 | Apr 12 | Oct 18 | 174 | Plan sowing from this date → |
| CASHTOWN 1S | Apr 28 | May 16 | Apr 15 | Oct 17 | 170 | Plan sowing from this date → |
| GRAYS LANDING | Apr 28 | May 14 | Apr 15 | Oct 21 | 175 | Plan sowing from this date → |
| MONTGOMERY L&D | Apr 28 | May 15 | Apr 15 | Oct 26 | 178 | Plan sowing from this date → |
| MOON TWP | Apr 28 | May 15 | Apr 15 | Oct 18 | 172 | Plan sowing from this date → |
| ALVIN R BUSH DAM | Apr 29 | May 14 | Apr 15 | Oct 21 | 177 | Plan sowing from this date → |
| BUCKSVILLE | Apr 29 | May 15 | Apr 16 | Oct 16 | 170 | Plan sowing from this date → |
| JOHNSTOWN CAMBRIA CO AP | Apr 29 | May 17 | Apr 14 | Oct 21 | 176 | Plan sowing from this date → |
| SALINA 3 W | Apr 29 | May 17 | Apr 14 | Oct 20 | 171 | Plan sowing from this date → |
| WOLFSBURG | Apr 29 | May 18 | Apr 12 | Oct 13 | 167 | Plan sowing from this date → |
| CONFLUENCE 1 SW DAM | Apr 30 | May 18 | Apr 17 | Oct 18 | 171 | Plan sowing from this date → |
| DONEGAL 2 NW | Apr 30 | May 18 | Apr 15 | Oct 17 | 170 | Plan sowing from this date → |
| LANDISVILLE 2 NW | Apr 30 | May 13 | Apr 16 | Oct 10 | 162 | Plan sowing from this date → |
| LINESVILLE 1 S | Apr 30 | May 17 | Apr 16 | Oct 23 | 177 | Plan sowing from this date → |
| LOCK HAVEN SEWAGE PLT | Apr 30 | May 15 | Apr 16 | Oct 20 | 173 | Plan sowing from this date → |
| MAHANOY CITY 2 N | Apr 30 | May 18 | Apr 15 | Oct 22 | 175 | Plan sowing from this date → |
| NEW CASTLE 1 N | Apr 30 | May 19 | Apr 17 | Oct 23 | 175 | Plan sowing from this date → |
| PORT MEADVILLE AP | Apr 30 | May 18 | Apr 16 | Oct 23 | 175 | Plan sowing from this date → |
| PT MARION LOCK 8 | Apr 30 | May 17 | Apr 14 | Oct 23 | 177 | Plan sowing from this date → |
| RENOVO | Apr 30 | May 17 | Apr 17 | Oct 22 | 173 | Plan sowing from this date → |
| SUNBURY | Apr 30 | May 19 | Apr 15 | Oct 13 | 166 | Plan sowing from this date → |
| UNIONTOWN 1 NE | Apr 30 | May 18 | Apr 15 | Oct 18 | 171 | Plan sowing from this date → |
| DEHART DAM | May 1 | May 20 | Apr 15 | Oct 16 | 168 | Plan sowing from this date → |
| E STROUDSBURG | May 1 | May 18 | Apr 18 | Oct 12 | 163 | Plan sowing from this date → |
| MT PLEASANT | May 1 | May 19 | Apr 17 | Oct 13 | 164 | Plan sowing from this date → |
| TIONESTA 2 SE LAKE | May 1 | May 18 | Apr 18 | Oct 25 | 176 | Plan sowing from this date → |
| FRANKLIN | May 2 | May 20 | Apr 20 | Oct 23 | 171 | Plan sowing from this date → |
| HIDDEN VALLEY | May 2 | May 18 | Apr 19 | Oct 17 | 168 | Plan sowing from this date → |
| LOYALHANNA LAKE | May 2 | May 18 | Apr 18 | Oct 14 | 163 | Plan sowing from this date → |
| MATAMORAS | May 2 | May 17 | Apr 20 | Oct 12 | 164 | Plan sowing from this date → |
| MCKEESPORT | May 2 | May 20 | Apr 17 | Oct 20 | 170 | Plan sowing from this date → |
| TOWANDA 1 S | May 2 | May 16 | Apr 20 | Oct 15 | 165 | Plan sowing from this date → |
| MILANVILLE | May 3 | May 21 | Apr 19 | Oct 9 | 156 | Plan sowing from this date → |
| WAYNESBURG 1 E | May 3 | May 21 | Apr 19 | Oct 15 | 164 | Plan sowing from this date → |
| BENTON 3 NE | May 4 | May 19 | Apr 21 | Oct 11 | 159 | Plan sowing from this date → |
| CLEARFIELD LAWRENCE AP | May 4 | May 22 | Apr 19 | Oct 11 | 161 | Plan sowing from this date → |
| FORD CITY 4 S DAM | May 4 | May 20 | Apr 20 | Oct 16 | 164 | Plan sowing from this date → |
| GRAMPIAN 1E | May 4 | May 21 | Apr 20 | Oct 13 | 160 | Plan sowing from this date → |
| JAMESTOWN 2 NW | May 4 | May 22 | Apr 22 | Oct 14 | 161 | Plan sowing from this date → |
| SHAWNEE SP | May 4 | May 21 | Apr 19 | Oct 10 | 158 | Plan sowing from this date → |
| WARREN | May 4 | May 22 | Apr 20 | Oct 21 | 168 | Plan sowing from this date → |
| MILLHEIM | May 5 | May 24 | Apr 22 | Oct 6 | 153 | Plan sowing from this date → |
| RECTOR 3 SSW | May 5 | May 22 | Apr 21 | Oct 6 | 152 | Plan sowing from this date → |
| DUBOIS JEFFERSON CO AP | May 6 | May 23 | Apr 19 | Oct 14 | 160 | Plan sowing from this date → |
| LAPORTE | May 6 | May 22 | Apr 22 | Oct 7 | 154 | Plan sowing from this date → |
| LAUREL SUMMIT | May 6 | May 23 | Apr 22 | Oct 12 | 159 | Plan sowing from this date → |
| MT POCONO MOUNTAINS AP | May 6 | May 23 | Apr 21 | Oct 8 | 154 | Plan sowing from this date → |
| TIOGA HAMMOND DAM | May 6 | May 23 | Apr 24 | Oct 10 | 158 | Plan sowing from this date → |
| BUTLER 2 SW | May 7 | May 23 | Apr 22 | Oct 14 | 159 | Plan sowing from this date → |
| EMPORIUM | May 7 | May 23 | Apr 23 | Oct 15 | 160 | Plan sowing from this date → |
| FRANCIS E WALTER DAM | May 7 | May 23 | Apr 22 | Oct 6 | 153 | Plan sowing from this date → |
| SLIPPERY ROCK 1 SSW | May 7 | May 25 | Apr 22 | Oct 14 | 158 | Plan sowing from this date → |
| UNION CITY FILTRATION PLANT | May 7 | May 24 | Apr 23 | Oct 10 | 155 | Plan sowing from this date → |
| INDIANA 3 SE | May 8 | May 24 | Apr 23 | Oct 13 | 157 | Plan sowing from this date → |
| SPRINGBORO 3 WNW | May 8 | May 23 | Apr 23 | Oct 16 | 160 | Plan sowing from this date → |
| CLARION 3 SW | May 9 | May 24 | Apr 24 | Oct 11 | 154 | Plan sowing from this date → |
| COWANESQUE DAM | May 9 | May 25 | Apr 25 | Oct 12 | 155 | Plan sowing from this date → |
| HAWLEY 1 E | May 10 | May 26 | Apr 26 | Oct 4 | 146 | Plan sowing from this date → |
| PRINCE GALLITZIN SP | May 10 | May 28 | Apr 25 | Oct 5 | 149 | Plan sowing from this date → |
| PUTNEYVILLE 2 SE DAM | May 10 | May 28 | Apr 24 | Oct 12 | 155 | Plan sowing from this date → |
| STEVENSON DAM | May 10 | May 27 | Apr 25 | Oct 16 | 157 | Plan sowing from this date → |
| WELLSBORO 4 SW | May 10 | May 26 | Apr 25 | Oct 5 | 148 | Plan sowing from this date → |
| MEYERSDALE 2 SSW | May 12 | May 28 | Apr 25 | Oct 5 | 146 | Plan sowing from this date → |
| TITUSVILLE WTR WKS | May 12 | May 28 | Apr 29 | Oct 10 | 149 | Plan sowing from this date → |
| COOKSBURG 2 NW | May 13 | May 28 | Apr 28 | Oct 7 | 143 | Plan sowing from this date → |
| PHILIPSBURG 2 S | May 13 | May 29 | Apr 25 | Oct 1 | 142 | Plan sowing from this date → |
| RIDGWAY | May 13 | May 28 | Apr 26 | Oct 11 | 150 | Plan sowing from this date → |
| COUDERSPORT 7SE | May 14 | May 30 | Apr 28 | Oct 4 | 143 | Plan sowing from this date → |
| DUSHORE | May 14 | May 27 | Apr 28 | Oct 2 | 143 | Plan sowing from this date → |
| GLEN HAZEL 2 NE DAM | May 14 | May 29 | Apr 28 | Oct 6 | 143 | Plan sowing from this date → |
| MONTROSE | May 14 | May 28 | Apr 29 | Oct 2 | 141 | Plan sowing from this date → |
| PLEASANT MT 1 W | May 14 | May 29 | Apr 30 | Oct 1 | 140 | Plan sowing from this date → |
| CLERMONT 1 NW | May 15 | May 31 | Apr 30 | Oct 3 | 140 | Plan sowing from this date → |
| MERCER | May 15 | Jun 1 | Apr 30 | Oct 3 | 140 | Plan sowing from this date → |
| PORT ALLEGANY | May 15 | May 29 | Apr 29 | Oct 6 | 144 | Plan sowing from this date → |
| CANTON | May 16 | May 29 | Apr 27 | Oct 2 | 139 | Plan sowing from this date → |
| EBENSBURG SEWAGE PLT | May 17 | Jun 1 | Apr 30 | Oct 2 | 136 | Plan sowing from this date → |
| BRADFORD 4SW RSCH 5 | May 18 | May 31 | Apr 30 | Oct 4 | 140 | Plan sowing from this date → |
| BRADFORD RGNL AP | May 18 | May 31 | Apr 30 | Oct 1 | 136 | Plan sowing from this date → |
| CHALK HILL 2 ENE | May 19 | Jun 2 | Apr 30 | Oct 1 | 135 | Plan sowing from this date → |
| OSWAYO 1 ENE | May 20 | Jun 2 | May 5 | Sep 29 | 130 | Plan sowing from this date → |
| CLARENCE | May 21 | Jun 1 | Apr 30 | Sep 27 | 130 | Plan sowing from this date → |
| CHANDLERS VALLEY 1SE | May 22 | Jun 5 | May 6 | Sep 30 | 131 | Plan sowing from this date → |
| COUDERSPORT 1 SW | May 22 | Jun 6 | May 6 | Oct 1 | 130 | Plan sowing from this date → |
| KANE 1NNE | May 24 | Jun 7 | May 6 | Sep 28 | 126 | Plan sowing from this date → |
How to read the three dates
Average is the date by which, in half of the years between 1991 and 2020, the last 32 °F night had already happened. Safe is later: only one year in ten saw a frost after it, which is the date to transplant tomatoes and peppers, both killed by a single frost. Early is the risky end, with a frost after it in nine years out of ten.
Every figure is for the weather station, not for your garden. A valley bottom, a north slope or a spot near a lake can run a week or two either way. Cities are warmer than the countryside around them.
Where the numbers come from
The dates are NOAA's U.S. Climate Normals for 1991 to 2020, computed by the National Centers for Environmental Information for every station with thirty years of daily minimum temperatures. ZIP codes are matched to the nearest such station within 150 km using U.S. Census Bureau ZIP Code Tabulation Area centroids. Stations that never see a frost, such as much of south Florida, report no date and are left out.