Root Vegetable

When to Plant Garlic in Oregon

Plant in fall, harvest in summer. Garlic is one of the most rewarding crops for the patient gardener.

The Short Answer

In Oregon, soil conditions are an important factor for garlic. Rich volcanic soils in Willamette Valley. Dry, alkaline soils east of Cascades. Acidic forest soils on coast. Generally excellent for gardening in valleys. Garlic can also be planted in fall, 6 weeks before your first frost.

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

Garlic Planting Schedule for Oregon

Willamette Valley (Zones 8a, 8b)

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

Fall Planting
6 wks before first frost

Portland Metro (Zones 8b, 9a)

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

Fall Planting
6 wks before first frost

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

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

Fall Planting
6 wks before first frost

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

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

Fall Planting
6 wks before first frost

Growing Garlic in Oregon

Garlic in Oregon's Climate

Garlic grows well in warm climates but choose softneck varieties — most hardneck types don't get enough cold for proper bulb formation south of zone 7. Plant in October-November. Your mild winter means garlic grows actively through the cool months rather than going fully dormant. Harvest in May-June when lower leaves brown. Elephant garlic (actually a leek relative) also thrives in warm zones.

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 garlic 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. Garlic can handle frost well, which is an advantage in Oregon's climate. You can push planting dates earlier in spring and extend into fall.

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 garlic — adjust your planting dates to match your specific region.

Growing Tips

Plant individual cloves pointy-side up in fall, 4-6 weeks before ground freezes. Mulch heavily. Harvest when lower leaves brown.

Companion Planting

Plant garlic alongside these companions for better growth:

Tomatoes Peppers Lettuce Beets

Keep garlic away from:

Beans Peas

The Bottom Line

Garlic 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

Garlic Growing Guide National planting guide with all states Oregon Planting Calendar All plants for Oregon Garlic in Alabama Alabama planting dates Garlic in Alaska Alaska planting dates Garlic in Arizona Arizona planting dates Garlic 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

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