Frost Dates for Spokane, Washington, United States of America

Coordinates: 47.659, -117.425

Growing Season

The last spring air frost in Spokane, Washington, United States of America typically occurs around Jun 1, and the first autumn air frost around Sep 8. This gives a frost-free growing season of approximately 99 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 -4°C (25°F). The warmest month is July, with an average high of 30°C (86°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Jun 1 (last spring) to Sep 8 (first autumn). Light ground frost (-1°C / 30°F): May 16 (last spring) to Sep 17 (first autumn). Hard ground frost (-2°C / 28°F): Apr 21 (last spring) to Oct 3 (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: Hard Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from Jun 1 to Sep 8, which provides approximately 98 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 May 16 to Sep 17, which provides a total of 124 days for growing.

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