Frost Dates for Belfast, Belfast, United Kingdom

Coordinates: 54.583, -5.933

Growing Season

The last spring air frost in Belfast, Belfast, United Kingdom typically occurs around May 5, and the first autumn air frost around Oct 19. This gives a frost-free growing season of approximately 167 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 3°C (37°F). The warmest month is July, with an average high of 18°C (64°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 5 (last spring) to Oct 19 (first autumn). Light ground frost (-1°C / 30°F): Apr 13 (last spring) to Nov 12 (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: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from May 5 to Oct 19, which provides approximately 166 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 13 to Nov 12, which provides a total of 213 days for growing.

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