The current average 2-inch soil temperature across Pennsylvania is 65°F. Readings range from 64°F to 66°F, from 3 USDA and NOAA monitoring stations. Soil across Pennsylvania is running 2°F above the seasonal normal of 63°F for early October, based on 3 of 3 stations with historical records. Pennsylvania spans USDA hardiness zones 5b to 7b, cool-season grass country. Last updated September 30, 2026.
Soil across Pennsylvania is cooling off its summer peak at an average of 65°F at 2 inches. The fall poa annua pre-emergent window is in play as readings fall through the 65–70°F band, and cool-season overseeding follows close behind.
For cool-season lawns (fescue, bluegrass, ryegrass), fall is the best time to plant grass seed in Pennsylvania, with spring the second choice: fall seedlings face less weed competition and mature before summer heat. The window opens as 2-inch soil falls back through 70°F, and germination slows sharply once soil drops below 50°F, typically around November 2.
Spring is the second choice: the window opens when soil first holds 50°F and narrows as soil passes 65°F, typically by May 22.
Fall seeding also needs a stop date: new seedlings want about six weeks of growth before frost arrives. Your city page estimates the last safe seeding date from its nearest station: see when to plant in Philadelphia, when to plant in Pittsburgh or when to plant in Erie. Readings current through September 30, 2026: Pennsylvania averages 65°F at 2 inches right now; the Current Planting Conditions section above reads that number against the season.
Typical dates are computed from historical 2-inch soil temperature averages at 3 monitoring stations in Pennsylvania; your own window depends on your nearest station's readings.
Historical 2-inch soil temperature normals for Pennsylvania: the median across 3 in-state stations with multi-year records. Any given year runs ahead of or behind these values; the live average at the top of this page shows where this year stands.
| Month | Average 2-inch soil temperature |
|---|---|
| January | 34°F |
| February | 34°F |
| March | 42°F |
| April | 52°F |
| May | 62°F |
| June | 70°F |
| July | 76°F |
| August | 73°F |
| September | 67°F |
| October | 55°F |
| November | 45°F |
| December | 37°F |
Shaded spring cells fall in the 50°F to 55°F pre-emergent window at 2-inch depth. The highlighted row is the current month.
Grass seed germination
Grass seed germination temperatures across Pennsylvania. Soil warmth varies by location, so check a city page for the live reading and what germinates there now.
| Grass species | Seeding soil temp (2 in) | Days |
|---|---|---|
| Kentucky bluegrass | 60–70°F | 14-30 |
| Tall fescue | 60–70°F | 7-12 |
| Perennial ryegrass | 60–70°F | 5-10 |
| Fine fescue | 60–70°F | 7-14 |
| Bermudagrass | 75–90°F | 10-30 |
For root-zone timing (fertilizer, aeration, weed control), see the 4-inch soil temperature for Pennsylvania. For accumulated-heat timing, see growing degree days for Pennsylvania. For how wet the ground is versus normal, see soil moisture for Pennsylvania. See the Pennsylvania soil temperature map for the full station view.
Interpolated from the latest 4-inch readings and refreshed daily.
| Station | 2" Temp | Last Reading |
|---|---|---|
| Mahantango Ck (Northumberland) | 65°F | 2026-09-30 |
| Rock Springs Pa (Centre) | 64°F | 2026-09-30 |
| Avondale 2 N | 66°F | 2026-09-30 |
| City | ZIP | Current Temp |
|---|---|---|
| Academy Life | 19488 | 66°F |
| Albion | 16401 | 61°F* |
| Allentown | 18101 | 66°F |
| Altoona | 16601 | 64°F |
| Beaver Springs | 17812 | 65°F |
| Bethlehem | 18015 | 66°F |
| Blue Bell | 19422 | 66°F |
| Boyers | 16016 | 61°F* |
| Butler | 16001 | 62°F* |
| Camp Hill | 17001 | 65°F |
| Carlisle | 17013 | 65°F |
| Carnegie | 15106 | 64°F |
| Chambersburg | 17201 | 64°F |
| Chester | 19013 | 66°F |
| Concordville | 19331 | 66°F |
| Conshohocken | 19428 | 66°F |
| Cresson | 16630 | 64°F |
| Dallas | 18612 | 65°F |
| Danville | 17821 | 65°F |
| Doylestown | 18901 | 66°F |
| Eagleville | 19408 | 66°F |
| East Stroudsburg | 18301 | 65°F |
| Easton | 18040 | 66°F |
| Edinboro | 16412 | 61°F* |
| Emmaus | 18049 | 66°F |
| Erie | 16501 | 63°F* |
| Fort Washington | 19034 | 66°F |
| Frackville | 17931 | 65°F |
| Genesee | 16923 | 64°F |
| Greensburg | 15601 | 64°F |
| Hanover | 17331 | 67°F |
| Harleysville | 19438 | 66°F |
| Harrisburg | 17101 | 65°F |
| Hazleton | 18201 | 65°F |
| Holmes | 19043 | 66°F |
| Houtzdale | 16651 | 64°F |
| Huntingdon | 16652 | 64°F |
| Indiana | 15701 | 64°F |
| Johnstown | 15901 | 64°F |
| Lancaster | 17573 | 66°F |
| Lebanon | 17042 | 65°F |
| Lehigh Valley | 18001 | 66°F |
| Levittown | 19054 | 66°F |
| Mckeesport | 15131 | 60°F |
| Meadville | 16335 | 61°F* |
| Mechanicsburg | 17050 | 65°F |
| Media | 19063 | 66°F |
| New Castle | 16101 | 64°F |
| New Kensington | 15068 | 64°F |
| New Wilmington | 16142 | 64°F |
| Norristown | 19401 | 66°F |
| North Wales | 19454 | 66°F |
| Olyphant | 18447 | 59°F |
| Philadelphia | 19019 | 66°F |
| Pittsburgh | 15201 | 65°F* |
| Pittston | 18640 | 65°F |
| Pottstown | 19464 | 66°F |
| Reading | 19601 | 66°F |
| Scranton | 18501 | 65°F |
| Somerset | 15501 | 60°F |
| Southeastern | 19397 | 66°F |
| State College | 16801 | 64°F |
| Valley Forge | 19481 | 66°F |
| Warminster | 18974 | 66°F |
| Warren | 16365 | 59°F* |
| Warrendale | 15086 | 64°F |
| Wayne | 19080 | 66°F |
| West Chester | 19380 | 66°F |
| West Mifflin | 15122 | 60°F |
| Wilkes Barre | 18701 | 65°F |
| Williamsport | 17701 | 65°F |
| York | 17401 | 65°F |
Modeled estimate where no monitoring station is within 99 miles; all other readings are measured at USDA and NOAA stations.
Fall is the best time to overseed a thin lawn.
Fall is when broadleaf herbicide works hardest.
Apply winterizer when your 2-inch soil temperature falls through 50°F, typically late October to mid-November for cool-season lawns.
Check whether your soil is warm enough for the seed you bought: cool-season grass seeds into 50-65°F soil (tall fescue prefers 60°F and up), warm-season into 75-85°F.
The current average 2-inch soil temperature across Pennsylvania is 65°F. Readings range from 64°F to 66°F depending on location and elevation, from 3 USDA and NOAA monitoring stations. Soil across Pennsylvania is running 2°F above the seasonal normal of 63°F for early October, based on 3 of 3 stations with historical records.
Apply pre-emergent herbicide when soil at 2 inches reaches 55°F for several consecutive days. Timing varies across Pennsylvania, so check your city's page for station-specific readings and the pre-emergent timing recommendation.
Pennsylvania spans USDA hardiness zones 5b to 7b, cool-season grass country. For cool-season grasses (fescue, bluegrass), the fall window typically opens around August 30 and the spring window around April 1, based on historical 2-inch soil temperature averages at 3 in-state stations. Timing varies by location, so check your city's planting window for the dates specific to your area.