Spring oats Planting Dates in Washington

Usual spring oats planting and harvest periods in Washington, shown as ranges with their source. Use them to frame a plan, then adjust for your own frost dates and soil temperature.

Spring oats dates in Washington
Activity	Window	Source	Last verified
Planting	Mar 5 to Apr 20 usual (most active Mar 10 to Apr 10)	source	2026-11-11
Harvest	Jul 15 to Sep 10 usual (most active Aug 1 to Aug 30)	source	2026-11-11

Spring oats calendar for Washington
Item	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Planting			Planting window, most active in March	Planting window, most active in April
Harvest							Harvest window in July	Harvest window, most active in August	Harvest window in September

What these dates mean in Washington

Planting usually runs about 47 days, from Mar 5 to Apr 20.

That start date is about 26 days earlier than the middle of the 24 places in this data set that report spring oats planting dates (Mar 31).

Harvest usually runs about 58 days, from Jul 15 to Sep 10.

From the start of the planting window to the start of the harvest window is about 132 days in Washington, a rough guide to how long the crop occupies the bed or field.

Frost-date caveat: these are published ranges for Washington. A northern or high-elevation site will run later than a southern or low one, and a cold wet spring can push planting past the window. Frost dates and local conditions vary; NASS state-level usual dates from 20-year progress data (Oct 2010 edition), begin ~5% and end ~95% complete. Check your last spring frost and soil temperature, and confirm with your county extension office.

Related guides

Oats Planting Calendar

Spring oats dates in other places

Other crops in Washington

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.