Soil Types in Pennsylvania

Pennsylvania has 1416 zip codes in our database. The most common soil type is Loam, found in 0% of the state. Understanding your local soil type helps you choose the right plants and amendments for your garden.

Pennsylvania spans USDA hardiness zones 5b through 8a. Your hardiness zone determines which perennial plants will survive winter in your area. Enter your zip code above to find your exact zone and get personalized planting recommendations.

Pennsylvania's geology reads like a textbook, and its soils follow the geological formations. The southeastern Piedmont, including Lancaster County, has some of the most productive non-irrigated farmland in the world — deep, limestone-derived soils worked by Amish and other farmers for over 300 years. The Ridge and Valley province across central Pennsylvania alternates between limestone valley soils (fertile, neutral pH) and shale ridge soils (thin, acidic). The Appalachian Plateau of western Pennsylvania has glaciated soils in the north (richer, deeper) and unglaciated soils in the south (thinner, more acidic). Hazleton loam, the state soil, represents the mountain soils formed from sandstone and shale. The Lake Erie shoreline has glacial soils supporting the state's grape belt.

Pennsylvania's growing season ranges from about 120 days in the northern mountains to 200 days in the southeast. Philadelphia and the Delaware Valley enjoy about 200 frost-free days, with the last frost near April 1 and first frost in late November. Pittsburgh in the west has about 175 days. State College in the center has 155 days. The Pocono Mountains and northern tier have 120-140 days. Pennsylvania receives 38-48 inches of rain annually, well-distributed throughout the year — irrigation is optional for most gardens. The state's varied elevation and proximity to the Atlantic create numerous microclimates that experienced gardeners learn to exploit.

Pennsylvania's agricultural diversity earned Lancaster County its reputation as the 'Garden Spot of America.' Mushrooms are the state's top crop by value — the limestone caves and cool climate of Chester County produce over 60% of U.S. mushrooms. Apples are a major fruit crop, with Adams County in the south-central region being a prime production area. The Lake Erie grape belt produces wine grapes and Concord grapes for juice. For home gardens, Pennsylvania's moderate climate and fertile soils grow excellent tomatoes, peppers, sweet corn, potatoes, beans, and squash. The limestone valley soils produce superior root crops. Blueberries grow well in the state's acidic mountain soils without amendment.

Penn State Extension provides soil testing through the Agricultural Analytical Services Laboratory for about $10-15. Pennsylvania soils range from alkaline limestone valley soils to very acidic mountain soils — testing before amending is critical. Philadelphia and Pittsburgh both have urban soil contamination concerns due to their industrial histories. Lead from historic smelters, paint, and gasoline can be elevated in older neighborhoods. Penn State's soil test includes lead screening. For rural gardens, the most common needs are lime for mountain soils and organic matter universally. Lancaster County's Amish farms demonstrate what centuries of manure application, crop rotation, and careful stewardship can achieve with Pennsylvania soils.