Frost Dates for Plymouth, Devon, United Kingdom

Coordinates: 50.389, -4.147

Growing Season

The last spring air frost in Plymouth, Devon, United Kingdom typically occurs around Apr 29, and the first autumn air frost around Nov 2. This gives a frost-free growing season of approximately 187 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 9a, where the average annual extreme minimum temperature is -6.7 to -3.9°C (20 to 25°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 5°C (41°F). The warmest month is July, with an average high of 19°C (66°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 29 (last spring) to Nov 2 (first autumn). Light ground frost (-1°C / 30°F): Apr 11 (last spring) to Dec 4 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 9a

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

Current Risk Level: Air Frost possible

for today based on past data only.

We predict a frost free growing season at your location from Apr 29 to Nov 2, which provides approximately 186 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 11 to Dec 4, which provides a total of 237 days for growing.

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