Root Vegetable

When to Plant Potatoes in Oregon

Incredibly satisfying to grow. There's nothing quite like digging up your own potatoes — it's like buried treasure.

The Short Answer

In Oregon, soil conditions are an important factor for potatoes. Rich volcanic soils in Willamette Valley. Dry, alkaline soils east of Cascades. Acidic forest soils on coast. Generally excellent for gardening in valleys. Direct sow 2 weeks before your last frost date.

Oregon Frost Dates

Your planting dates depend on which part of Oregon you're in. Here are the frost date ranges by region:

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

Potatoes Planting Schedule for Oregon

Willamette Valley (Zones 8a, 8b)

Average last frost: Mar 25 - Apr 15 · Average first frost: Oct 15 - Nov 10

Direct Sow
2 wks before frost

Portland Metro (Zones 8b, 9a)

Average last frost: Mar 15 - Apr 5 · Average first frost: Oct 25 - Nov 15

Direct Sow
2 wks before frost

Central/Eastern Oregon (Zones 5a, 5b, 6a, 6b)

Average last frost: May 10 - Jun 1 · Average first frost: Sep 10 - Oct 1

Direct Sow
2 wks before frost

Southern Oregon Coast (Zones 8b, 9a, 9b)

Average last frost: Mar 5 - Mar 25 · Average first frost: Nov 5 - Nov 25

Direct Sow
2 wks before frost

Growing Potatoes in Oregon

Potatoes in Oregon's Climate

Potatoes are a cool-season crop in warm climates — plant in late winter for late spring harvest before summer heat shuts tuber growth down. Once soil temperatures exceed 85°F consistently, tuber growth stops. Choose heat-tolerant varieties like Red LaSoda. Some southern growers plant a second crop in August for fall harvest.

Soil Considerations for Oregon

Rich volcanic soils in Willamette Valley. Dry, alkaline soils east of Cascades. Acidic forest soils on coast. Generally excellent for gardening in valleys. Loose, well-drained soil is especially important for potatoes since the edible portion grows underground. If your soil is heavy clay, consider raised beds.

Oregon Climate & Growing Season

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

Growing season length varies across Oregon: Willamette Valley (8a, 8b) has a last frost around Mar 25 - Apr 15, while Southern Oregon Coast (8b, 9a, 9b) sees frost end around Mar 5 - Mar 25. This difference matters for potatoes — adjust your planting dates to match your specific region.

Growing Tips

Plant seed potatoes (not grocery store potatoes) 2-3 weeks before last frost. Hill soil around stems as they grow to increase yield.

Companion Planting

Plant potatoes alongside these companions for better growth:

Beans Corn Cabbage Marigolds

Keep potatoes away from:

Tomatoes Squash Sunflowers

The Bottom Line

Potatoes can be grown successfully across Oregon, but your exact planting dates depend on which region you're in. Willamette Valley gardeners should plan around a Mar 25 - Apr 15 last frost, while those in Southern Oregon Coast can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Potatoes Growing Guide National planting guide with all states Oregon Planting Calendar All plants for Oregon Potatoes in Alabama Alabama planting dates Potatoes in Alaska Alaska planting dates Potatoes in Arizona Arizona planting dates Potatoes in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

Ready to Start Planting?

Enter your zip code and pick your plant. We'll tell you exactly when to plant, start seeds, and harvest — based on where you live.

Find Your Planting Dates