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When to Plant Soybeans in Oregon

Soybeans (edamame) are a high-protein legume that fixes nitrogen in the soil. Fresh green soybeans harvested at the edamame stage are a nutritious snack.

Oregon spans USDA hardiness zones 5a, 5b, 6a, 6b, 7a, 8a, 8b, 9a (with planting data available), so planting dates vary by your location within the state. Click your zone below for the most accurate dates.

Find Your County

Click your county for exact Soybeans planting dates based on your local frost dates.

Hover over a county to see details. Click to view planting guide.

Soybeans Planting Calendar for Oregon

Zone 5a ~166 day growing season · Full guide →

Last frost: April 25 · First frost: October 8 · 166 day season

Activity When Date Range
Direct Sow May 2 May 2 – May 23
Harvest July 25 Jul 25 – Sep 19
Zone 5b ~178 day growing season · Full guide →

Last frost: April 18 · First frost: October 13 · 178 day season

Activity When Date Range
Direct Sow April 25 Apr 25 – May 16
Harvest July 18 Jul 18 – Sep 12
Zone 6a ~193 day growing season · Full guide →

Last frost: April 10 · First frost: October 20 · 193 day season

Activity When Date Range
Direct Sow April 17 Apr 17 – May 8
Harvest July 10 Jul 10 – Sep 4
Zone 6b ~205 day growing season · Full guide →

Last frost: April 3 · First frost: October 25 · 205 day season

Activity When Date Range
Direct Sow April 10 Apr 10 – May 1
Harvest July 3 Jul 3 – Aug 28
Zone 7a ~221 day growing season · Full guide →

Last frost: March 25 · First frost: November 1 · 221 day season

Activity When Date Range
Direct Sow April 1 Apr 1 – Apr 22
Harvest June 24 Jun 24 – Aug 19
Zone 8a ~255 day growing season · Full guide →

Last frost: March 8 · First frost: November 18 · 255 day season

Activity When Date Range
Direct Sow March 15 Mar 15 – Apr 5
Harvest June 7 Jun 7 – Aug 2
Zone 8b ~276 day growing season · Full guide →

Last frost: February 25 · First frost: November 28 · 276 day season

Activity When Date Range
Direct Sow March 4 Mar 4 – Mar 25
Harvest May 27 May 27 – Jul 22
Zone 9a ~303 day growing season · Full guide →

Last frost: February 10 · First frost: December 10 · 303 day season

Activity When Date Range
Direct Sow February 17 Feb 17 – Mar 10
Harvest May 12 May 12 – Jul 7

Growing Tips for Oregon

Direct sow after soil warms to 60F. Plant in blocks rather than rows for better pollination. Harvest for edamame when pods are plump and bright green.

Frequently Asked Questions

When should I plant Soybeans in Oregon?

Planting dates for Soybeans in Oregon depend on your USDA zone. Oregon spans zones 5a, 5b, 6a, 6b, 7a, 8a, 8b, 9a. Check the planting calendar above for your specific zone's frost dates and planting windows.

What zone is Oregon for planting?

Oregon contains USDA hardiness zones 5a, 5b, 6a, 6b, 7a, 8a, 8b, 9a. Your specific zone depends on your location within the state — northern and higher-elevation areas are in colder zones, while southern and coastal areas are warmer.

Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals, University Cooperative Extension planting guides. Last updated: April 2026.