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Frost Dates for Boston, Massachusetts, United States of America

Coordinates: 42.358, -71.060

Growing Season

The last spring air frost in Boston, Massachusetts, United States of America typically occurs around Apr 28, and the first autumn air frost around Oct 2. This gives a frost-free growing season of approximately 157 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 6b, where the average annual extreme minimum temperature is -20.6 to -17.8°C (-5 to 0°F). This zone rating helps gardeners determine which perennial plants are likely to survive winter.

Temperature Overview

The coldest month is January, with an average low of -4°C (25°F). The warmest month is July, with an average high of 28°C (82°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 28 (last spring) to Oct 2 (first autumn). Light ground frost (-1°C / 30°F): Apr 18 (last spring) to Oct 10 (first autumn). Hard ground frost (-2°C / 28°F): Apr 2 (last spring) to Oct 24 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 6b

... and the frost data for your area is ...

Current Risk Level: Light Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from Apr 28 to Oct 2, which provides approximately 156 frost free days.

For the less tender plants, or if you are planning to protect your plants with fleece etc, your growing season could stretch from Apr 18 to Oct 10, which provides a total of 175 days for growing.

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