Paxton Soil Series

The Paxton soil series is Massachusetts's official state soil. It sits on the rolling hills and gentle uplands shaped by glaciers — the same landscape of stone walls, woodlots, and apple orchards that defines central and eastern Massachusetts.

Paxton is a well-drained loamy soil, very deep to bedrock but only moderately deep to a stiff layer of compacted glacial till about two feet down. That dense layer — the Cd horizon — was packed tight by the Laurentide Ice Sheet and still shapes how farmers plant and builders build across the commonwealth.

The Paxton series was first described and mapped in Worcester County in 1922, named after the town of Paxton where soil scientists made their earliest detailed study of the series.

By the time Massachusetts was selecting a state soil, Paxton was already well known to the state's soil scientists, farmers, and land managers. It is the most extensive single soil series in Massachusetts, found in nearly every mainland county — a clear choice to represent the commonwealth.

The Massachusetts Legislature designated the Paxton series as the official state soil in 1990. The law is brief and direct: Massachusetts General Laws, Chapter 2, Section 33 states that 'The Paxton Soil Series shall be the official soil of the commonwealth.'

Paxton soil has four main layers. If you dug down through a central Massachusetts hillside, you would find dark surface soil giving way to yellower subsoil, then a stiff olive-colored layer of glacial till that stops most roots from going any deeper.

That bottom layer — the Cd horizon — is the defining feature of Paxton soil. The glacier that deposited it was more than a mile thick, and its weight compressed the till so firmly that the compaction still holds today. Water builds up briefly above it each spring before the upper soil dries out.

Paxton soil covers about 400,000 acres — roughly 7.5 percent of Massachusetts — and is found across virtually all of mainland Massachusetts. It is absent from Cape Cod, Martha's Vineyard, and Nantucket, where coastal sands and different glacial deposits dominate.

This soil sits on the rolling till uplands that form the backbone of central and eastern Massachusetts — the same gently hilly terrain where settlers cleared stones by hand and stacked them into the field walls still visible across the landscape. Paxton is the most extensive soil series in the state.

Outside Massachusetts, the Paxton series also appears in Connecticut, Rhode Island, New Hampshire, Vermont, and eastern New York, wherever the same glacial till landscape extends across New England.

Paxton soil is productive farmland once the surface stones are cleared. The main crops are apples, corn, and silage. Farmers also use it for hay and pasture. The upper layers hold moisture well, which helps crops through dry summer stretches.

Apple orchards have the deepest historical connection to this soil. The well-drained but moisture-retentive surface suits apple trees, and the dense till below keeps shallow root systems anchored. Massachusetts has grown apples on Paxton soil since colonial times, and the state remains one of the leading apple-producing states in the Northeast.

Where land is not farmed, Paxton soil supports New England's characteristic mixed forest: red oak, white oak, and black oak alongside hickory, sugar maple, and red maple, with gray birch, black birch, eastern white pine, and eastern hemlock filling in the canopy and wet pockets.