Warm-Season Vegetable

When to Plant Beans (Green/Snap) in Washington

Easy, productive, and they even improve your soil by fixing nitrogen. A perfect crop for beginners.

The Short Answer

Washington State's bean growing divides cleanly along the Cascades. Western Washington's mild summers are actually good for beans — warm enough for production without the extreme heat that causes blossom drop in southern states. Eastern Washington's hot, dry conditions grow beans quickly with minimal disease. Both sides produce quality harvests, though the timing and pest pressures differ.

Washington Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Western Washington (Seattle/Tacoma) 8a, 8b Mar 25 - Apr 15 Oct 25 - Nov 15
Puget Sound 8b, 9a Mar 15 - Apr 5 Nov 1 - Nov 20
Eastern Washington 5b, 6a, 6b, 7a Apr 25 - May 15 Sep 25 - Oct 15
Central Washington 6a, 6b, 7a Apr 20 - May 10 Oct 1 - Oct 20

Beans (Green/Snap) Planting Schedule for Washington

Western Washington (Seattle/Tacoma) (Zones 8a, 8b)

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

Direct Sow
1 wks after frost

Puget Sound (Zones 8b, 9a)

Average last frost: Mar 15 - Apr 5 · Average first frost: Nov 1 - Nov 20

Direct Sow
1 wks after frost

Eastern Washington (Zones 5b, 6a, 6b, 7a)

Average last frost: Apr 25 - May 15 · Average first frost: Sep 25 - Oct 15

Direct Sow
1 wks after frost

Central Washington (Zones 6a, 6b, 7a)

Average last frost: Apr 20 - May 10 · Average first frost: Oct 1 - Oct 20

Direct Sow
1 wks after frost

Growing Beans (Green/Snap) in Washington

State-Specific Growing Tips

Western Washington: direct sow from late May to early June when soil reaches 60°F. Beans grow well in the Puget Sound region — they're more reliable than tomatoes or peppers because they don't need intense heat. Eastern Washington: direct sow from mid-May. Hot days and cool nights produce excellent snap beans. In western Washington's acidic soils, check pH and lime if below 6.0. In eastern Washington's alkaline soils, beans actually improve soil fertility through nitrogen fixation — they're an excellent rotation crop for irrigated gardens.

Recommended Varieties for Washington

Blue Lake (originally from Oregon) is the Pacific Northwest standard. Provider for early plantings in western Washington's cooler soil. Kentucky Wonder pole beans produce well on both sides of the Cascades. Scarlet Runner beans are popular in western Washington as ornamental edibles. WSU Extension provides variety recommendations for both regions.

Common Challenges in Washington

In western Washington, slugs damage emerging seedlings — protect with iron phosphate bait. Root rot can occur in poorly drained clay soils during wet springs. In eastern Washington, spider mites in hot, dry conditions are the main concern. Mexican bean beetle and Japanese beetle are uncommon in Washington — a significant advantage over eastern states. Minimal fungal disease in the dry climate.

Growing Tips

Direct sow only — beans don't transplant well. Inoculate seeds with rhizobium for better nitrogen fixation.

Companion Planting

Plant beans (green/snap) alongside these companions for better growth:

Corn Squash Carrots Cucumbers

Keep beans (green/snap) away from:

Onions Garlic Chives

The Bottom Line

Beans (Green/Snap) can be grown successfully in Washington with proper attention to regional frost dates and local growing conditions. Timing varies across the state — Western Washington (Seattle/Tacoma) gardeners work with a last frost around Mar 25 - Apr 15, while Central Washington sees frost end around Apr 20 - May 10. Choose varieties suited to your region, amend your soil based on its specific needs, and monitor for the pests and diseases most common in your area. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Beans (Green/Snap) Growing Guide National planting guide with all states Washington Planting Calendar All plants for Washington Beans (Green/Snap) in Alabama Alabama planting dates Beans (Green/Snap) in Alaska Alaska planting dates Beans (Green/Snap) in Arizona Arizona planting dates Beans (Green/Snap) 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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