Updated daily

Pennsylvania soil temperature

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Estimated 2–4 inch soil temperature, statewide average . Based on NOAA weather stations near representative Pennsylvania locations.

Check your exact ZIP

Enter your ZIP code for the estimated soil temperature near you, plus what it means for seasonal pre-emergent timing. Use the separate tools below for other lawn tasks.

What this soil temperature means for your Pennsylvania lawn

The Pennsylvania reading loads from the latest daily data. Use the value above or enter your ZIP code for a location-specific recommendation.

Estimated soil temperature at Pennsylvania locations

ZIP code Est. soil temp Data through
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Values load from each ZIP's nearest NOAA station in the current R2 snapshot. Enter your own ZIP above for a reading closer to home.

Elevation Drives Pennsylvania Soil Temperature

Pennsylvania soil temperature is less about north versus south and more about up versus down. Philadelphia and the southeastern corner sit near sea level in zone 7 and warm first, often holding 55°F at 2-4 inches by early-to-mid April. The Poconos, the Laurel Highlands, and the high ridge-and-valley country can run two to three weeks behind, with soil still in the 40s when Philadelphia lawns are actively growing.

Pittsburgh and the western plateau fall in between, usually crossing the same thresholds in mid-to-late April. If you scan a Pennsylvania soil temp map in April, the pattern tracks the terrain almost exactly: every thousand feet of elevation costs roughly 3-4°F, and cold air pooling in mountain valleys adds frost nights that keep soil averages down.

The Spring and Fall Crossings That Matter

For a cool-season Pennsylvania lawn, two soil temperature crossings anchor the year. The spring climb through 55°F triggers crabgrass germination and sets the pre-emergent deadline, sweeping from the southeast corner in early April to the northern tier by early May. The late-summer fall back through the 60s opens the seeding and overseeding window, typically late August through September.

Penn State Extension, home to one of the world's leading turfgrass programs, builds its recommendations around these soil-driven windows. The practical rule for fall: seed while soil is still above 55°F so cool-season grasses germinate quickly, which means mountain lawns should finish seeding by mid-September while southeastern lawns can push into early October.

Reading Soil Temperature Across Pennsylvania Terrain

Beyond elevation, aspect and soil type split lawn behavior within a single Pennsylvania county. South-facing slopes in the ridge-and-valley region catch more direct sun and can run 5°F warmer at lawn depth than north-facing slopes across the road. The heavier clay soils common in the Piedmont and western plateau hold spring moisture and warm more slowly than the well-drained loams of the Great Valley.

This estimated lawn soil temperature for Pennsylvania is a statewide model with roughly a 5°F margin, so use it for the trend line and lean on the terrain rules for your own yard: sunny, sloped, and sandy runs early; shaded, flat, and wet runs late. Checking soil temperature in Pennsylvania today and adjusting for your site beats any fixed calendar.

How Pennsylvania compares to the rest of the country

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Estimated 2–4 inch soil temperature by state . Tap a state for its detailed page.

About Pennsylvania lawns

Pennsylvania is in USDA Hardiness Zones 5b-7b, with a cool-season lawn climate. Common grass types include Kentucky Bluegrass, Tall Fescue, Perennial Ryegrass, Fine Fescue.

These estimates are modeled from air temperature (about ±5°F at 2–4 inch depth — methodology). For local agronomic guidance, see the Penn State Extension.

Common Pennsylvania soil temperature questions

What is the current soil temperature in Pennsylvania?

This page shows a statewide estimated 2–4 inch soil temperature for Pennsylvania, recomputed daily from NOAA weather station records, plus per-ZIP estimates for representative Pennsylvania locations. Enter your ZIP code for the reading nearest you.

At what soil temperature should I apply pre-emergent in Pennsylvania?

Apply pre-emergent when Pennsylvania soil temperatures approach 55°F at a 2–4 inch depth in spring — crabgrass germinates as soil holds 55°F and above. In Pennsylvania that typically happens early april to late april.

What soil temperature does grass seed need in Pennsylvania?

Soil temperature alone does not set a seeding date. Seeding timing for common Pennsylvania lawns (Kentucky Bluegrass, Tall Fescue, Perennial Ryegrass, Fine Fescue) follows published regional calendars for each grass type; the overseeding tool shows any calendar available for your ZIP, with this estimate as context.

How accurate is this Pennsylvania soil temperature estimate?

It is modeled from air temperatures with a published lag model, not measured by in-ground sensors, and is typically within about ±5°F at 2–4 inch depth. Shade, moisture, and snow cover shift real readings; for precise numbers use a soil thermometer or Penn State Extension resources.

Why is soil in the Poconos so much colder than in Philadelphia?

The Poconos sit roughly 1,500-2,000 feet higher than Philadelphia, and temperature drops about 3.5°F per thousand feet. Add longer snow cover, more frost nights from cold-air pooling, and heavily shaded forest soils, and Pocono lawn soil commonly crosses 55°F two to three weeks after southeastern Pennsylvania, usually around late April to early May.

When does soil temperature reach 55 degrees around Philadelphia?

In a typical spring, lawns in Philadelphia and its suburbs hold a sustained 55°F at 2-4 inches by early-to-mid April, among the earliest readings in Pennsylvania. Warm springs can pull that into late March, which is why southeastern PA homeowners get caught by early crabgrass more often than anyone else in the state.

What soil temperature is too cold for fall seeding in Pennsylvania?

Cool-season grasses like tall fescue and Kentucky bluegrass germinate well while soil stays above 55°F and slow dramatically below 50°F. In the Pennsylvania mountains soil drops through that range by early October, so finish seeding there by mid-September. Southeastern lawns keep workable soil temperatures into mid-October in most years.

Soil temperature in nearby states

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View the national soil temperature map