Frost Dates for Nashua, New Hampshire, United States of America

Coordinates: 42.765, -71.468

Growing Season

The last spring air frost in Nashua, New Hampshire, United States of America typically occurs around May 11, and the first autumn air frost around Sep 17. This gives a frost-free growing season of approximately 129 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 5b, where the average annual extreme minimum temperature is -26.1 to -23.3°C (-15 to -10°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 -7°C (19°F). The warmest month is July, with an average high of 29°C (84°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 11 (last spring) to Sep 17 (first autumn). Light ground frost (-1°C / 30°F): Apr 30 (last spring) to Sep 26 (first autumn). Hard ground frost (-2°C / 28°F): Apr 14 (last spring) to Oct 11 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 5b

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

Current Risk Level: Hard Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from May 11 to Sep 17, which provides approximately 128 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 30 to Sep 26, which provides a total of 149 days for growing.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec