Frost Dates for Federal Way, Washington, United States of America

Coordinates: 47.323, -122.311

Growing Season

The last spring air frost in Federal Way, Washington, United States of America typically occurs around May 16, and the first autumn air frost around Oct 1. This gives a frost-free growing season of approximately 138 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 February, with an average low of 2°C (36°F). The warmest month is August, with an average high of 26°C (79°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 16 (last spring) to Oct 1 (first autumn). Light ground frost (-1°C / 30°F): Apr 23 (last spring) to Oct 22 (first autumn). Hard ground frost (-2°C / 28°F): Feb 27 (last spring) to Jan 7 (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: Light Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from May 16 to Oct 1, which provides approximately 137 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 23 to Oct 22, which provides a total of 182 days for growing.

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