Bield:Farm
State agricultural overview

Montana crop calendar.

Zone 4bRange 3a to 6a125-day seasonLast frost May 20First frost September 20

13 primary crops with planting windows for Montana. Calendar timing is anchored to 4b dominant hardiness zone and a 125-day growing season — verify against Montana State University Extension for variety- and county-specific guidance.

Row Crop · Montana

Vegetables · Montana

  • Cucumbers
    primary
    Spring: June 3 – July 8
  • Peppers
    primary
    Spring: June 10 – July 1
  • Potatoes
    primary
    Spring: May 6 – May 27
    Fall: July 7 – July 22
  • Pumpkins
    primary
    Spring: June 10 – July 8
  • Sweet Corn
    primary
    Spring: May 20 – June 24
  • Tomatoes
    primary
    Spring: June 3 – June 24

Forages · Montana

  • Alfalfa
    primary
    Spring: May 13 – June 10
    Fall: July 22 – August 6
  • Clover
    primary
    Spring: April 29 – May 27
    Fall: July 22 – August 6

Cover Crops · Montana

  • Brassicas
    primary
    Fall: July 7 – July 22
  • Buckwheat
    primary
    Spring: July 15 – August 12
  • Cereal Oats
    primary
    Spring: May 13 – June 10
    Fall: July 22 – August 6
  • Winter Rye
    primary
    Fall: September 13 – October 4

Frost-date reference — Montana

Last frost (spring)
May 20
First frost (fall)
September 20
Growing season
125 days
Hardiness zone
4b

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

Montana 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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