Frost Dates for Johannesburg, Gauteng, South Africa

Coordinates: -26.200, 28.083

Growing Season

The last spring air frost in Johannesburg, Gauteng, South Africa typically occurs around Aug 8, and the first autumn air frost around May 9. This gives a frost-free growing season of approximately -91 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 July, with an average low of 7°C (45°F). The warmest month is January, with an average high of 27°C (81°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Aug 8 (last spring) to May 9 (first autumn). Light ground frost (-1°C / 30°F): Jul 20 (last spring) to May 27 (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: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Aug 8 to May 9, which provides approximately 273 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 Jul 20 to May 27, which provides a total of 311 days for growing.

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