Bield:Farm
State agricultural overview

Illinois crop calendar.

Zone 6aRange 5a to 7a175-day seasonLast frost April 25First frost October 15

17 primary crops with planting windows for Illinois. Calendar timing is anchored to 6a dominant hardiness zone and a 175-day growing season — verify against University of Illinois Extension for variety- and county-specific guidance.

Row Crop · Illinois

Vegetables · Illinois

  • Cucumbers
    primary
    Spring: May 9 – June 13
  • Peppers
    primary
    Spring: May 16 – June 6
  • Potatoes
    primary
    Spring: April 11 – May 2
    Fall: August 1 – August 16
  • Pumpkins
    primary
    Spring: May 16 – June 13
  • Sweet Corn
    primary
    Spring: April 25 – May 30
  • Tomatoes
    primary
    Spring: May 9 – May 30

Forages · Illinois

  • Alfalfa
    primary
    Spring: April 18 – May 16
    Fall: August 16 – August 31
  • Clover
    primary
    Spring: April 4 – May 2
    Fall: August 16 – August 31

Cover Crops · Illinois

  • Brassicas
    primary
    Fall: August 1 – August 16
  • Buckwheat
    primary
    Spring: June 20 – July 18
  • Cereal Oats
    primary
    Spring: April 18 – May 16
    Fall: August 16 – August 31
  • Winter Rye
    primary
    Fall: October 8 – October 29

Frost-date reference — Illinois

Last frost (spring)
April 25
First frost (fall)
October 15
Growing season
175 days
Hardiness zone
6a

Frost dates are NOAA / NCDC climate normals — county-level variation can shift these by 2–4 weeks. The Illinois extension service publishes county-specific frost data: University of Illinois Extension.

Illinois soil-temp alerts.

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

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