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Frost Dates for Southampton, Hampshire, United Kingdom

Coordinates: 50.919, -1.397

Growing Season

The last spring air frost in Southampton, Hampshire, United Kingdom typically occurs around May 11, and the first autumn air frost around Oct 20. This gives a frost-free growing season of approximately 162 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 8b, where the average annual extreme minimum temperature is -9.4 to -6.7°C (15 to 20°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 3°C (37°F). The warmest month is July, with an average high of 21°C (70°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 11 (last spring) to Oct 20 (first autumn). Light ground frost (-1°C / 30°F): Apr 24 (last spring) to Nov 9 (first autumn). Hard ground frost (-2°C / 28°F): Mar 12 (last spring) to Dec 18 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 8b

... 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 May 11 to Oct 20, which provides approximately 161 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 24 to Nov 9, which provides a total of 199 days for growing.

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