Massachusetts is divided into several USDA Plant Hardiness Zones, which are based on average annual minimum temperatures. This helps gardeners and landscapers choose the best plants for their region's climate.
Massachusetts Plant Hardiness Zones:
Zone 5b: Areas in western Massachusetts and some higher elevation spots. Average minimum temperatures range from -15°F to -10°F. Western Massachusetts and higher elevation regions have colder winters, limiting plant choices to hardier species.
Zone 6a: Most of the central part of the state. Average minimum temperatures range from -10°F to -5°F. Much of central Massachusetts, including cities like Worcester, has a more moderate climate that supports a wide variety of plants.
Zone 6b: Areas on the southeastern coast and parts of the Cape and Islands. Average minimum temperatures range from -5°F to 0°F. The coastal regions, including parts of the South Shore, enjoy a slightly warmer climate with the ability to grow a broader range of plants.
Zone 7a: The very southern parts of the state, including parts of the Cape Cod region. Average minimum temperatures range from 0°F to 5°F. The southernmost parts of the state, such as parts of Cape Cod, experience the mildest winters and allow for a larger variety of plant options, including more tender species.
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