Mustard Planting Dates in Southern Illinois

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

Mustard dates in Southern Illinois
Activity	Window	Source	Last verified
Planting	March 15 to April 15, June 15 to Aug. 15	source	2026-11-11

Mustard calendar for Southern Illinois
Item	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Planting			Planting window in March	Planting window in April		Planting window in June	Planting window in July	Planting window in August

What these dates mean in Southern Illinois

Planting usually runs about 32 days, from Mar 15 to Apr 15.

That start date is about 31 days earlier than the middle of the 7 places in this data set that report mustard planting dates (Apr 15).

Frost-date caveat: these are published ranges for Southern Illinois. 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. Planting dates are a general guide; frost dates and local conditions vary. Check your last spring frost and soil temperature, and confirm with your county extension office.

Related guides

Mustard Greens Planting Calendar

Mustard dates in other places

Other crops in Southern Illinois

Last reviewed: November 2026. Source: Illinois Extension - When to Plant (Home Vegetable Gardening).