Vermont's USDA plant hardiness zones range primarily from 4a to 6a, with some variation depending on the specific region within the state:
- Zone 4a (-30°F to -25°F): The coldest parts of Vermont, mainly in northern Essex County and eastern Orleans County, fall into this zone. These areas experience very cold winters and a short growing season
- Zone 4b (-25°F to -20°F): Covers parts of Essex, Orleans, and some central regions. Winters are still harsh but slightly milder than 4a
- Zone 5a (-20°F to -15°F): Most of Vermont, including central areas like Burlington and Montpelier, fall into this zone. It has a moderately short growing season and heavy snowfall in winter
- Zone 5b (-15°F to -10°F): Found in southern and some central parts of Vermont, including areas near Lake Champlain and cities like Vergennes and Brattleboro. This zone has a moderate growing season and significant snowfall
- Zone 6a (-10°F to -5°F): Small pockets in southern Vermont, especially around Windsor and Windham counties, have this warmer zone with milder winters and a longer growing season
In summary, Vermont's growing zones cover a range from 4a in the coldest northern areas up to 6a in some southern sheltered spots, with most of the state situated in zones 4b, 5a, and 5b
