Soybeans planting and harvest dates

Soybeans Planting Dates in Iowa

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

Soybeans dates in Iowa
Activity	Window	Source	Last verified
Planting	May 2 to Jun 16 usual (most active May 8 to Jun 2)	source	2026-11-11
Harvest	Sep 21 to Oct 31 usual (most active Sep 28 to Oct 20)	source	2026-11-11

Soybeans calendar for Iowa
Item	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Planting					Planting window, most active in May	Planting window, most active in June
Harvest									Harvest window, most active in September	Harvest window, most active in October

What these dates mean in Iowa

Planting usually runs about 46 days, from May 2 to Jun 16.

That start date is close to the middle of the 31 places in this data set that report soybeans planting dates (May 4).

Harvest usually runs about 41 days, from Sep 21 to Oct 31.

From the start of the planting window to the start of the harvest window is about 142 days in Iowa, a rough guide to how long the crop occupies the bed or field.

Frost-date caveat: these are published ranges for Iowa. 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

Soybeans dates in other places

Other crops in Iowa

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.