Frost Dates and Planting Windows in Pennsylvania

The 32°F frost dates at the 160 weather stations in Pennsylvania with NOAA's 1991–2020 Climate Normals, and the planting windows they give. These are long-term statistics, not a forecast. For the dates at the station nearest you, enter your ZIP code.

Frost dates across Pennsylvania

Each risk level uses a date with a set chance of frost. In spring, it's the chance of a 32°F frost on or after the last-frost date. In fall, it's the chance of the first 32°F frost on or before the first-frost date. At the Typical level (30%), the last frost ranges from April 3 to May 30 across the state, and the first frost from September 21 to November 11.

32°F frost dates: earliest and latest among 160 stations, by risk level
Risk level	Earliest last frost	Latest last frost	Earliest first frost	Latest first frost
Conservative (10%)	April 9MARCUS HOOK, PA US	June 7KANE 1NNE, PA US	September 11KANE 1NNE, PA US	November 4PHILA FRANKLIN INST, PA US
Typical (30%)	April 3MARCUS HOOK, PA US	May 30KANE 1NNE, PA US	September 212 stations	November 11PHILA FRANKLIN INST, PA US
Aggressive (50%)	March 302 stations	May 24KANE 1NNE, PA US	September 27CLARENCE, PA US	November 17PHILA FRANKLIN INST, PA US

Growing season length

The growing season is the stretch between the last spring frost and the first fall frost at 32°F. NOAA gives it as a length with a chance of being at least that long. Each risk level uses the length with that chance of a shorter season, so Conservative shows the shortest lengths.

Growing season at 32°F: shortest and longest among 160 stations
Risk level	Shortest	Longest
Conservative (90% chance of at least this long)	104 daysKANE 1NNE, PA US	214 daysPHILA FRANKLIN INST, PA US
Typical (70% chance of at least this long)	117 daysKANE 1NNE, PA US	223 days2 stations
Aggressive (50% chance of at least this long)	126 daysKANE 1NNE, PA US	232 daysPHILA FRANKLIN INST, PA US

Number of stations by growing season length, Typical (70% chance of at least this long)
Growing season	Stations
100–119 days	1
120–139 days	22
140–159 days	39
160–179 days	66
180–199 days	25
200–219 days	5
220–239 days	2

Planting windows across Pennsylvania

For each crop, the earliest start and the latest end of its Typical windows among the stations. A window at any one station is shorter and falls inside this span. Transplant dates are for seedlings.

Typical planting windows (30% frost dates): earliest start and latest end among stations
Crop and task	Earliest start	Latest end	Stations
Basil: Transplant outdoors	April 17	June 13	160 of 160
Bean: Sow outdoors	April 3	May 30	160 of 160
Beet: Sow outdoors	March 6	May 30	160 of 160
Beet: Sow for fall	June 29	September 22	160 of 160
Broccoli: Transplant outdoors	March 6	May 16	160 of 160
Broccoli: Transplant for fall	June 19	September 22	160 of 160
Brussels sprouts: Transplant outdoors	March 6	May 16	160 of 160
Brussels sprouts: Transplant for fall	May 30	October 2	160 of 160
Cabbage: Transplant outdoors	March 6	May 16	160 of 160
Cabbage: Transplant for fall	June 14	September 22	160 of 160
Cantaloupe: Transplant outdoors	April 17	June 13	160 of 160
Cantaloupe: Sow outdoors	April 17	June 13	160 of 160
Carrot: Sow outdoors	March 6	May 30	160 of 160
Carrot: Sow for fall	June 19	September 12	160 of 160
Cucumber: Transplant outdoors	April 10	June 6	160 of 160
Cucumber: Sow outdoors	April 3	May 30	160 of 160
Eggplant: Transplant outdoors	April 17	June 13	160 of 160
Garlic: Plant for fall	September 21	November 25	160 of 160
Lettuce: Transplant outdoors	March 6	May 16	160 of 160
Lettuce: Sow outdoors	March 6	May 16	160 of 160
Lettuce: Sow for fall	June 19	October 2	160 of 160
Onion: Transplant or plant sets	March 6	May 16	160 of 160
Peas: Sow outdoors	March 6	May 16	160 of 160
Peas: Sow for fall	June 27	September 22	160 of 160
Pepper: Transplant outdoors	April 17	June 13	160 of 160
Potato: Plant seed potatoes	March 6	May 30	160 of 160
Pumpkin: Sow outdoors	April 17	June 13	160 of 160
Radish: Sow outdoors	March 6	May 16	160 of 160
Radish: Sow for fall	August 3	October 22	160 of 160
Spinach: Transplant outdoors	March 6	May 16	160 of 160
Spinach: Sow outdoors	March 6	May 16	160 of 160
Spinach: Sow for fall	July 9	October 5	160 of 160
Summer squash: Transplant outdoors	April 10	June 6	160 of 160
Summer squash: Sow outdoors	April 3	May 30	160 of 160
Sweet corn: Sow outdoors	April 3	May 30	160 of 160
Sweet potato: Plant slips	April 10	June 13	160 of 160
Tomato: Transplant outdoors	April 17	June 13	160 of 160
Turnip: Sow outdoors	March 6	May 16	160 of 160
Turnip: Sow for fall	July 9	October 2	160 of 160
Watermelon: Transplant outdoors	April 17	June 13	160 of 160
Watermelon: Sow outdoors	April 17	June 13	160 of 160

Weather stations in Pennsylvania

Every station in Pennsylvania with NOAA frost-date normals, with its Typical 32°F frost dates and growing season.

Typical (30%) 32°F frost dates by station
Station	Elevation	Last frost	First frost	Growing season
ACMETONIA LOCK 3, PA US	750 ft	April 23	October 26	188 days
ALLENTOWN INTL AP, PA US	390 ft	April 26	October 17	176 days
ALTOONA 3 W, PA US	1,320 ft	May 1	October 15	167 days
ALTOONA 7 SW, PA US	1,180 ft	May 2	October 14	168 days
ALTOONA BLAIR CO AP, PA US	1,480 ft	April 30	October 14	167 days
ALVIN R BUSH DAM, PA US	930 ft	May 4	October 15	169 days
AVONDALE 2 N, PA US	400 ft	April 24	October 19	179 days
BEAR GAP, PA US	1,020 ft	May 4	October 12	163 days
BEAVER FALLS 1 NE, PA US	760 ft	May 4	October 18	168 days
BENTON 3 NE, PA US	1,100 ft	May 10	October 5	151 days
BIGLERVILLE, PA US	720 ft	April 22	October 20	185 days
BLOSERVILLE 1 N, PA US	700 ft	April 25	October 19	182 days
BLUE MARSH LAKE, PA US	350 ft	May 4	October 13	166 days
BRADDOCK LOCK 2, PA US	730 ft	April 12	November 4	210 days
BRADFORD 4SW RSCH 5, PA US	1,660 ft	May 24	September 29	132 days
BRADFORD RGNL AP, PA US	2,120 ft	May 24	September 26	128 days
BUCKSVILLE, PA US	390 ft	May 5	October 11	161 days
BUTLER 2 SW, PA US	1,000 ft	May 14	October 8	151 days
CANTON, PA US	1,140 ft	May 22	September 26	131 days
CARLISLE WTP, PA US	430 ft	April 30	October 11	168 days
CASHTOWN 1S, PA US	710 ft	May 4	October 11	162 days
CHALK HILL 2 ENE, PA US	1,980 ft	May 25	September 25	126 days
CHAMBERSBURG 1 ESE, PA US	640 ft	April 25	October 19	178 days
CHANDLERS VALLEY 1SE, PA US	1,490 ft	May 28	September 24	123 days
CHARLEROI LOCK 4, PA US	750 ft	April 21	November 1	196 days
CLARENCE, PA US	1,390 ft	May 27	September 21	121 days
CLARION 3 SW, PA US	1,040 ft	May 16	October 5	147 days
CLEARFIELD LAWRENCE AP, PA US	1,520 ft	May 10	October 5	151 days
CLERMONT 1 NW, PA US	2,080 ft	May 22	September 29	132 days
COATESVILLE 2 W, PA US	640 ft	April 24	October 19	181 days
CONFLUENCE 1 SW DAM, PA US	1,490 ft	May 6	October 12	161 days
CONNELLSVILLE 2 SSW, PA US	900 ft	April 30	October 22	178 days
COOKSBURG 2 NW, PA US	1,450 ft	May 21	October 2	135 days
COUDERSPORT 1 SW, PA US	1,650 ft	May 29	September 27	122 days
COUDERSPORT 7SE, PA US	2,150 ft	May 22	September 30	133 days
COWANESQUE DAM, PA US	1,150 ft	May 16	October 5	147 days
DEHART DAM, PA US	540 ft	May 9	October 10	159 days
DONEGAL 2 NW, PA US	1,800 ft	May 7	October 11	160 days
DONORA 1 SW, PA US	760 ft	May 5	October 17	168 days
DOYLESTOWN AP, PA US	390 ft	April 19	October 24	189 days
DUBOIS JEFFERSON CO AP, PA US	1,810 ft	May 13	October 7	149 days
DUSHORE, PA US	1,530 ft	May 20	September 28	133 days
E STROUDSBURG, PA US	470 ft	May 7	October 6	154 days
EBENSBURG SEWAGE PLT, PA US	1,940 ft	May 25	September 27	126 days
EISENHOWER NHS, PA US	540 ft	April 30	October 15	170 days
EMPORIUM, PA US	1,040 ft	May 13	October 8	151 days
EMSWORTH L/D OHIO RVR, PA US	720 ft	April 30	October 21	176 days
ERIE INTL AP, PA US	730 ft	May 2	October 30	184 days
EVERETT, PA US	1,000 ft	May 4	October 11	161 days
FORD CITY 4 S DAM, PA US	930 ft	May 10	October 10	156 days
FRANCIS E WALTER DAM, PA US	1,510 ft	May 14	October 1	144 days
FRANKLIN, PA US	1,020 ft	May 9	October 17	163 days
GLEN HAZEL 2 NE DAM, PA US	1,720 ft	May 21	October 1	135 days
GLENMOORE, PA US	500 ft	April 17	October 27	196 days
GLENWILLARD DASHIELDS L&D, PA US	710 ft	April 16	November 2	204 days
GRAMPIAN 1E, PA US	1,510 ft	May 11	October 6	150 days
GRATERFORD 1 E, PA US	280 ft	May 1	October 8	164 days
GRAYS LANDING, PA US	800 ft	May 4	October 16	168 days
HAMBURG, PA US	370 ft	April 21	October 18	180 days
HANOVER 4 SW, PA US	560 ft	May 2	October 13	167 days
HARRISBURG 1 NE, PA US	420 ft	April 21	October 16	180 days
HARRISBURG CPTL CY AP, PA US	340 ft	April 16	October 25	196 days
HAWLEY 1 E, PA US	890 ft	May 17	October 1	138 days
HIDDEN VALLEY, PA US	2,880 ft	May 8	October 12	160 days
HOPEWELL MORGANTOWN, PA US	550 ft	April 22	October 20	184 days
INDIANA 3 SE, PA US	1,100 ft	May 15	October 7	148 days
JAMESTOWN 2 NW, PA US	1,040 ft	May 12	October 8	152 days
JOHNSTOWN CAMBRIA CO AP, PA US	2,280 ft	May 5	October 14	166 days
KANE 1NNE, PA US	1,750 ft	May 30	September 21	117 days
LANCASTER 2NE FLTR PLT, PA US	270 ft	April 27	October 17	178 days
LANCASTER AP, PA US	400 ft	April 25	October 19	179 days
LANDISVILLE 2 NW, PA US	360 ft	May 5	October 5	155 days
LAPORTE, PA US	1,970 ft	May 13	October 2	145 days
LAUREL MTN, PA US	2,760 ft	May 2	October 11	164 days
LAUREL SUMMIT, PA US	2,730 ft	May 13	October 7	150 days
LAURELTON CTR, PA US	800 ft	May 1	October 12	167 days
LEBANON 2 W, PA US	450 ft	April 27	October 19	177 days
LEHIGHTON 1SSW, PA US	460 ft	April 28	October 17	176 days
LEWISBURG, PA US	500 ft	May 2	October 13	166 days
LEWISTOWN, PA US	460 ft	April 28	October 17	177 days
LINESVILLE 1 S, PA US	1,030 ft	May 6	October 17	167 days
LOCK HAVEN SEWAGE PLT, PA US	570 ft	May 6	October 13	164 days
LOYALHANNA LAKE, PA US	990 ft	May 9	October 9	154 days
MAHANOY CITY 2 N, PA US	1,710 ft	May 7	October 16	166 days
MARCUS HOOK, PA US	10 ft	April 3	November 10	223 days
MATAMORAS, PA US	460 ft	May 8	October 6	156 days
MCKEESPORT, PA US	740 ft	May 10	October 11	159 days
MERCER, PA US	1,220 ft	May 23	September 28	131 days
MEYERSDALE 2 SSW, PA US	2,000 ft	May 19	October 1	137 days
MIDDLETOWN HARRISBURG INTL AP, PA US	310 ft	April 15	October 27	198 days
MILANVILLE, PA US	760 ft	May 11	October 3	148 days
MILLHEIM, PA US	1,120 ft	May 14	October 1	145 days
MONTGOMERY L&D, PA US	690 ft	May 5	October 20	169 days
MONTROSE, PA US	1,420 ft	May 21	September 29	132 days
MOON TWP, PA US	1,170 ft	May 4	October 12	164 days
MT PLEASANT, PA US	1,000 ft	May 8	October 8	156 days
MT POCONO MOUNTAINS AP, PA US	1,920 ft	May 14	October 3	146 days
MURRYSVILLE 2 SW, PA US	860 ft	April 29	October 19	176 days
NATRONA LOCK 4, PA US	760 ft	April 21	October 28	191 days
NESHAMINY FALLS, PA US	40 ft	April 27	October 18	176 days
NEW CASTLE 1 N, PA US	830 ft	May 7	October 16	166 days
NEW HOLLAND 2 SE, PA US	600 ft	April 20	October 26	190 days
NORRISTOWN, PA US	60 ft	April 15	October 25	195 days
OCTORARO LAKE, PA US	260 ft	May 2	October 16	171 days
OSWAYO 1 ENE, PA US	1,710 ft	May 27	September 23	122 days
PHILA FRANKLIN INST, PA US	60 ft	April 4	November 11	223 days
PHILADELPHIA INTL AP, PA US	10 ft	April 6	November 5	217 days
PHILADELPHIA NE AP, PA US	100 ft	April 9	November 1	208 days
PHILIPSBURG 2 S, PA US	1,720 ft	May 21	September 26	134 days
PHOENIXVILLE 1 E, PA US	80 ft	April 25	October 20	182 days
PITTSBURGH ALLEGHENY CO AP, PA US	1,250 ft	April 24	October 22	185 days
PITTSBURGH INTL AP, PA US	1,200 ft	May 1	October 18	173 days
PLEASANT MT 1 W, PA US	1,800 ft	May 20	September 28	132 days
PORT ALLEGANY, PA US	1,480 ft	May 22	October 1	137 days
PORT MEADVILLE AP, PA US	1,400 ft	May 7	October 16	166 days
POTTSTOWN LIMERICK AP, PA US	290 ft	April 27	October 17	177 days
PRINCE GALLITZIN SP, PA US	1,520 ft	May 19	October 1	140 days
PT MARION LOCK 8, PA US	810 ft	May 6	October 17	168 days
PUTNEYVILLE 2 SE DAM, PA US	1,280 ft	May 19	October 6	144 days
RAYSTOWN HQ, PA US	1,000 ft	April 27	October 22	183 days
RAYSTOWN LAKE 2, PA US	1,000 ft	April 26	October 22	181 days
READING 4 NNW, PA US	360 ft	April 17	October 24	193 days
READING SPAATZ FLD, PA US	340 ft	April 21	October 22	188 days
RECTOR 3 SSW, PA US	1,330 ft	May 12	October 1	143 days
RENOVO, PA US	660 ft	May 6	October 15	164 days
RIDGWAY, PA US	1,360 ft	May 20	October 4	141 days
RODALE RSCH CTR, PA US	550 ft	May 3	October 8	162 days
S MTN, PA US	1,520 ft	May 3	October 15	168 days
SAFE HARBOR DAM, PA US	190 ft	April 6	November 5	213 days
SALINA 3 W, PA US	1,110 ft	May 5	October 14	163 days
SCHENLEY LOCK 5, PA US	780 ft	April 27	October 24	182 days
SELINSGROVE 2 S, PA US	420 ft	May 1	October 16	170 days
SELINSGROVE PENN VLY AP, PA US	440 ft	May 3	October 9	162 days
SELLERSVILLE, PA US	300 ft	May 1	October 12	167 days
SHAWNEE SP, PA US	1,270 ft	May 12	October 4	149 days
SHIPPENSBURG, PA US	680 ft	April 25	October 17	180 days
SLIPPERY ROCK 1 SSW, PA US	1,260 ft	May 15	October 7	149 days
SPRINGBORO 3 WNW, PA US	1,000 ft	May 14	October 9	151 days
SPRINGTOWN 1 NNE, PA US	860 ft	April 27	October 16	175 days
STATE COLLEGE, PA US	1,170 ft	April 27	October 20	178 days
STEVENSON DAM, PA US	930 ft	May 17	October 10	149 days
SUNBURY, PA US	580 ft	May 7	October 6	157 days
TIOGA HAMMOND DAM, PA US	1,230 ft	May 12	October 4	149 days
TIONESTA 2 SE LAKE, PA US	1,200 ft	May 9	October 18	167 days
TITUSVILLE WTR WKS, PA US	1,220 ft	May 19	October 3	141 days
TOWANDA 1 S, PA US	760 ft	May 8	October 8	156 days
UNION CITY FILTRATION PLANT, PA US	1,400 ft	May 14	October 4	145 days
UNIONTOWN 1 NE, PA US	960 ft	May 7	October 12	162 days
W CHESTER 2 NW, PA US	380 ft	May 2	October 12	165 days
WARREN, PA US	1,210 ft	May 11	October 14	160 days
WASHINGTON 3 NE, PA US	1,300 ft	May 3	October 17	171 days
WAYNESBURG 1 E, PA US	940 ft	May 11	October 10	154 days
WELLSBORO 4 SW, PA US	1,820 ft	May 17	September 30	139 days
WILKES-BARRE INTL AP, PA US	930 ft	April 30	October 13	169 days
WILLIAMSPORT 2, PA US	520 ft	May 1	October 16	173 days
WILLIAMSPORT, PA US	520 ft	May 1	October 15	171 days
WILLOW GROVE NAS, PA US	360 ft	April 17	October 27	196 days
WOLFSBURG, PA US	1,190 ft	May 7	October 7	158 days
YORK 3 SSW PUMP STN, PA US	390 ft	May 2	October 13	167 days
YORK AP, PA US	490 ft	May 3	October 12	166 days

Data sources

NOAA U.S. Climate Normals, frost dates, 1991–2020 normals, version 1.0.1: Files: us-climate-normals_1991-2020_v1.0.1_annualseasonal_multivariate_by-station_c20230404.tar.gz, inventory_30yr.txt from NOAA NCEI. Retrieved October 10, 2026.