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Frost Dates for Gresham, Oregon, United States of America

Coordinates: 45.498, -122.430

Growing Season

The last spring air frost in Gresham, Oregon, United States of America typically occurs around May 29, and the first autumn air frost around Sep 24. This gives a frost-free growing season of approximately 118 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 8a, where the average annual extreme minimum temperature is -12.2 to -9.4°C (10 to 15°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 27°C (81°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 29 (last spring) to Sep 24 (first autumn). Light ground frost (-1°C / 30°F): May 4 (last spring) to Oct 11 (first autumn). Hard ground frost (-2°C / 28°F): Mar 31 (last spring) to Nov 12 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 8a

... 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 29 to Sep 24, which provides approximately 117 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 4 to Oct 11, which provides a total of 160 days for growing.

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