State agricultural overview

Wyoming crop calendar.

Zone 4b
Range 3a to 6a
115-day season
Last frost May 25
First frost September 15

13 primary crops with planting windows for Wyoming. Calendar timing is anchored to 4b dominant hardiness zone and a 115-day growing season — verify against University of Wyoming Extension for variety- and county-specific guidance.

Row Crop · Wyoming

Sunflowers
primary
Spring: June 1 – June 29
Corn
secondary
Spring: May 25 – June 15
Soybeans
secondary
Spring: June 8 – June 29
Winter Wheat
secondary
Fall: September 8 – September 29
Grain Sorghum
limited
Spring: June 15 – July 13
Cotton
trial
Spring: June 8 – June 29

Vegetables · Wyoming

Cucumbers
primary
Spring: June 8 – July 13
Peppers
primary
Spring: June 15 – July 6
Potatoes
primary
Spring: May 11 – June 1
Fall: July 2 – July 17
Pumpkins
primary
Spring: June 15 – July 13
Sweet Corn
primary
Spring: May 25 – June 29
Tomatoes
primary
Spring: June 8 – June 29

Forages · Wyoming

Alfalfa
primary
Spring: May 18 – June 15
Fall: July 17 – August 1
Clover
primary
Spring: May 4 – June 1
Fall: July 17 – August 1

Cover Crops · Wyoming

Brassicas
primary
Fall: July 2 – July 17
Buckwheat
primary
Spring: July 20 – August 17
Cereal Oats
primary
Spring: May 18 – June 15
Fall: July 17 – August 1
Winter Rye
primary
Fall: September 8 – September 29

Frost & extension reference

Wyoming climate anchors.

Last frost

May 25

First frost

September 15

Growing season

115 days

Hardiness zone

Wyoming county-level frost dates →University of Wyoming Extension →

Wyoming planting timing. Live alerts.

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

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