Frost Dates for Leiden, South Holland, Netherlands

Coordinates: 52.158, 4.493

Growing Season

The last spring air frost in Leiden, South Holland, Netherlands typically occurs around Apr 17, and the first autumn air frost around Oct 29. This gives a frost-free growing season of approximately 195 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 February, with an average low of 3°C (37°F). The warmest month is August, with an average high of 21°C (70°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 17 (last spring) to Oct 29 (first autumn). Light ground frost (-1°C / 30°F): Mar 29 (last spring) to Nov 20 (first autumn). Hard ground frost (-2°C / 28°F): Feb 5 (last spring) to Jan 9 (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 Apr 17 to Oct 29, which provides approximately 194 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 Mar 29 to Nov 20, which provides a total of 236 days for growing.

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