State agricultural overview

Washington crop calendar.

Zone 8a
Range 4b to 9a
195-day season
Last frost April 15
First frost October 25

13 primary crops with planting windows for Washington. Calendar timing is anchored to 8a dominant hardiness zone and a 195-day growing season — verify against WSU Extension for variety- and county-specific guidance.

Row Crop · Washington

Corn
primary
Spring: April 15 – May 6
Cotton
primary
Spring: April 29 – May 20
Grain Sorghum
primary
Spring: May 6 – June 3
Soybeans
primary
Spring: April 29 – May 20
Winter Wheat
primary
Fall: October 18 – November 8
Sunflowers
secondary
Spring: April 22 – May 20

Vegetables · Washington

Cucumbers
primary
Spring: April 29 – June 3
Peppers
primary
Spring: May 6 – May 27
Pumpkins
primary
Spring: May 6 – June 3
Sweet Corn
primary
Spring: April 15 – May 20
Tomatoes
primary
Spring: April 29 – May 20
Potatoes
secondary
Spring: April 1 – April 22
Fall: August 11 – August 26

Forages · Washington

Clover
primary
Spring: March 25 – April 22
Fall: August 26 – September 10
Alfalfa
secondary
Spring: April 8 – May 6
Fall: August 26 – September 10

Cover Crops · Washington

Brassicas
primary
Fall: August 11 – August 26
Winter Rye
primary
Fall: October 18 – November 8
Buckwheat
secondary
Spring: June 10 – July 8
Cereal Oats
secondary
Spring: April 8 – May 6
Fall: August 26 – September 10

Frost & extension reference

Washington climate anchors.

Last frost

April 15

First frost

October 25

Growing season

195 days

Hardiness zone

Washington county-level frost dates →WSU Extension →

Washington planting timing. Live alerts.

Bield: Farm ties weather and soil-temperature stations in your county to crop planting thresholds — get notified the day soil temp clears your target window.

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