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Crop Planting Dates in Washington

Published planting and harvest windows for 6 crops in Washington, in one calendar. Ranges only, with sources.

Windows in Washington
CropPlantingHarvest
Alfalfa hayMay 15 to Oct 1
CornPlanting: Apr 10 to Jun 1Sep 25 to Nov 25
Spring barleyPlanting: Mar 20 to May 10Jul 25 to Sep 5
Spring oatsPlanting: Mar 5 to Apr 20Jul 15 to Sep 10
Spring wheatPlanting: Mar 15 to May 10Jul 25 to Sep 5
Winter wheatPlanting: Aug 30 to Oct 20Jul 15 to Aug 30

Calendar view

Planting calendar for Washington
ItemJanFebMarAprMayJunJulAugSepOctNovDec
Alfalfa hay harvestHarvest window in MayHarvest window, most active in JuneHarvest window, most active in JulyHarvest window, most active in AugustHarvest window, most active in SeptemberHarvest window in October
Corn plantingPlanting window, most active in AprilPlanting window, most active in MayPlanting window in June
Corn harvestHarvest window in SeptemberHarvest window, most active in OctoberHarvest window, most active in November
Spring barley plantingPlanting window, most active in MarchPlanting window, most active in AprilPlanting window, most active in May
Spring barley harvestHarvest window in JulyHarvest window, most active in AugustHarvest window in September
Spring oats plantingPlanting window, most active in MarchPlanting window, most active in April
Spring oats harvestHarvest window in JulyHarvest window, most active in AugustHarvest window in September
Spring wheat plantingPlanting window, most active in MarchPlanting window, most active in AprilPlanting window in May
Spring wheat harvestHarvest window in JulyHarvest window, most active in AugustHarvest window in September
Winter wheat plantingPlanting window in AugustPlanting window, most active in SeptemberPlanting window, most active in October
Winter wheat harvestHarvest window, most active in JulyHarvest window, most active in August
Frost-date caveat: published dates are averages. Find your own last and first frost dates and compare them with these ranges before you plant.

Last reviewed: November 2026. Source: USDA NASS, Field Crops Usual Planting and Harvesting Dates (October 2010 edition, copy hosted by Cornell University Mann Library). Dates are the usual start and end of the period when about 5% to 95% of the crop is planted or harvested, from long-run state progress data. They are historic averages, not a forecast.