Frost Dates for Helsinki, Southern Finland, Finland

Coordinates: 60.176, 24.934

Growing Season

The last spring air frost in Helsinki, Southern Finland, Finland typically occurs around May 9, and the first autumn air frost around Sep 22. This gives a frost-free growing season of approximately 136 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 7a, where the average annual extreme minimum temperature is -17.8 to -15°C (0 to 5°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 -6°C (21°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 9 (last spring) to Sep 22 (first autumn). Light ground frost (-1°C / 30°F): Apr 28 (last spring) to Oct 5 (first autumn). Hard ground frost (-2°C / 28°F): Apr 10 (last spring) to Nov 4 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 7a

... 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 9 to Sep 22, which provides approximately 135 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 28 to Oct 5, which provides a total of 160 days for growing.

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