Bield:Farm
State agricultural overview

Colorado crop calendar.

Zone 5bRange 3a to 7a145-day seasonLast frost May 10First frost October 5

16 primary crops with planting windows for Colorado. Calendar timing is anchored to 5b dominant hardiness zone and a 145-day growing season — verify against Colorado State University Extension for variety- and county-specific guidance.

Row Crop · Colorado

Vegetables · Colorado

  • Cucumbers
    primary
    Spring: May 24 – June 28
  • Peppers
    primary
    Spring: May 31 – June 21
  • Potatoes
    primary
    Spring: April 26 – May 17
    Fall: July 22 – August 6
  • Pumpkins
    primary
    Spring: May 31 – June 28
  • Sweet Corn
    primary
    Spring: May 10 – June 14
  • Tomatoes
    primary
    Spring: May 24 – June 14

Forages · Colorado

  • Alfalfa
    primary
    Spring: May 3 – May 31
    Fall: August 6 – August 21
  • Clover
    primary
    Spring: April 19 – May 17
    Fall: August 6 – August 21

Cover Crops · Colorado

  • Brassicas
    primary
    Fall: July 22 – August 6
  • Buckwheat
    primary
    Spring: July 5 – August 2
  • Cereal Oats
    primary
    Spring: May 3 – May 31
    Fall: August 6 – August 21
  • Winter Rye
    primary
    Fall: September 28 – October 19

Frost-date reference — Colorado

Last frost (spring)
May 10
First frost (fall)
October 5
Growing season
145 days
Hardiness zone
5b

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

Colorado 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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