Oregon Planting Calendar

Frost dates, growing zones, and planting dates for Oregon gardeners.

Zone 4b Zone 5a Zone 5b Zone 6a Zone 6b Zone 7a Zone 7b Zone 8a Zone 8b Zone 9a Zone 9b

The Short Answer

Oregon spans USDA zones 4b through 9b, which means planting dates vary significantly across the state. Willamette Valley has an average last frost around Mar 25 - Apr 15, while Southern Oregon Coast sees its last frost around Mar 5 - Mar 25. Use our homepage tool with your zip code for dates specific to your exact location.

Oregon Frost Dates by Region

Dramatic east-west climate divide. Wet, mild winters west of Cascades. Dry, cold winters east. Year-round gardening possible in mild western valleys.

Region Zones Last Frost (Spring) First Frost (Fall)
Willamette Valley 8a, 8b Mar 25 - Apr 15 Oct 15 - Nov 10
Portland Metro 8b, 9a Mar 15 - Apr 5 Oct 25 - Nov 15
Central/Eastern Oregon 5a, 5b, 6a, 6b May 10 - Jun 1 Sep 10 - Oct 1
Southern Oregon Coast 8b, 9a, 9b Mar 5 - Mar 25 Nov 5 - Nov 25

Soil & Growing Conditions

Rich volcanic soils in Willamette Valley. Dry, alkaline soils east of Cascades. Acidic forest soils on coast. Generally excellent for gardening in valleys.

What to Plant in Oregon

Oregon's long season gives you two planting windows and room for crops that colder states can't grow. The key is timing around your summer heat peak:

Heat Lovers (Oregon's Advantage)

OkraSweet PotatoesWatermelonEggplantPeppers

Spring & Fall Crops

TomatoesCucumbersBeans (Green/Snap)Squash (Summer)Corn (Sweet)BasilGarlicLettuceBroccoliCarrotsKalePeas

Flowers & Perennials

SunflowersZinniasLavenderMarigoldsDaylilies

Browse all 100 plants — or enter your zip code for personalized planting dates.

Neighboring States

Gardeners near state borders may find useful information in neighboring state guides:

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming
Note: Frost dates are based on NOAA 30-year Climate Normals and represent historical averages. Actual frost dates can vary significantly year to year. Zone data is from the USDA Plant Hardiness Zone Map.

Last reviewed: March 29, 2026

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