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Frost Dates for Washington, District of Columbia, United States of America

Coordinates: 38.895, -77.037

Growing Season

The last spring air frost in Washington, District of Columbia, United States of America typically occurs around Apr 13, and the first autumn air frost around Oct 7. This gives a frost-free growing season of approximately 177 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 -2°C (28°F). The warmest month is July, with an average high of 32°C (90°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 13 (last spring) to Oct 7 (first autumn). Light ground frost (-1°C / 30°F): Apr 3 (last spring) to Oct 15 (first autumn). Hard ground frost (-2°C / 28°F): Mar 15 (last spring) to Oct 31 (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: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Apr 13 to Oct 7, which provides approximately 176 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 3 to Oct 15, which provides a total of 195 days for growing.

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