When To Plant Corn In Wyoming

The best time to plant corn in Wyoming is between mid-May and early June, once the soil has warmed to at least 50°F and the danger of a hard frost has passed.
 
Wyoming’s short growing season and unpredictable weather make timing everything when you decide when to plant corn in Wyoming.
 
If you plant too early, cold soil can cause the seeds to rot before they even sprout, and a late frost can kill young seedlings.
 
If you plant too late, your corn might not have enough warm days to fully mature before the first fall freeze arrives.
 
In this post, we’ll break down the exact windows for when to plant corn in Wyoming, how to check your soil temperature, and tips for extending your season in high-altitude regions.
 
Let’s dig into the details so you can get your corn off to a strong start.
 

When to Plant Corn in Wyoming: The Key Factors

The ideal time to plant corn in Wyoming depends on your specific elevation, local microclimate, and the corn variety you choose.
 
Wyoming spans USDA hardiness zones 3 through 5, which means the growing season can be as short as 90 days in the mountains and up to 140 days in the warmer southeastern plains.
 
So when you ask when to plant corn in Wyoming, the answer always starts with your last frost date, which typically falls between May 15 and June 10 depending on your county.
 
Let’s look at the main factors that influence your exact planting date.
 

1. Soil Temperature Matters More Than the Calendar

Corn seeds need soil temperatures of at least 50°F to germinate reliably, but 55°F to 60°F is even better for uniform sprouting.
 
Before you plant corn in Wyoming, grab a soil thermometer and check the temperature at a depth of 2 inches in the morning.
 
If the soil is still cold and wet, the seeds will sit there and may rot, especially in Wyoming’s heavy clay soils.
 
You can warm the soil faster by planting on a south-facing slope or using black plastic mulch a few weeks before your intended planting date.
 
 

2. Elevation and Hardiness Zones

Wyoming’s average elevation is about 6,700 feet, and that altitude dramatically affects when to plant corn in Wyoming.
 
At elevations above 5,000 feet, such as in Laramie or Jackson, the growing season is short, so you’ll want to plant as soon as the soil warms in late May.
 
In lower elevations like Torrington or Cheyenne, you can sometimes plant a week or two earlier, around mid-May.
 
Choose short-season corn varieties that mature in 65 to 80 days if you live in the mountains, or you’ll run out of warm weather.
 
 

3. Frost Dates and Microclimates

The average last spring frost in Wyoming ranges from May 10 in the southeast to June 5 in the northwest.
 
You should always wait until after your local last frost date to plant corn in Wyoming, because corn is extremely sensitive to frost.
 
Keep an eye on your specific microclimate, as cold air settles in valleys and can cause frost pockets that kill young corn.
 
If you’re in a windy area, consider planting in rows that run east to west to reduce wind damage and help the soil stay warmer.
 
 

Best Planting Windows for Different Regions of Wyoming

When to plant corn in Wyoming isn’t a one-size-fits-all answer, so here are the general windows by region.
 
These dates are based on average conditions, so always double-check your local forecast before planting.
 

1. Southeastern Wyoming (Cheyenne, Torrington, Laramie)

In southeastern Wyoming, the best time to plant corn is between May 15 and May 30.
 
This region gets slightly warmer weather earlier, and the soil usually reaches 50°F by mid-May.
 
If you’re in Laramie at a higher elevation, push your planting toward late May or early June to be safe.
 
 

2. Central and Western Wyoming (Casper, Riverton, Lander)

For central and western areas, aim to plant corn in Wyoming between May 25 and June 5.
 
These regions have a shorter growing season and colder nights, so waiting a bit longer pays off.
 
You’ll want to stick with early-maturing varieties like “Early Golden Bantam” or “Northern Extra Sweet” that can handle cooler conditions.
 
 

3. Mountain and High-Altitude Areas (Jackson, Cody, Yellowstone Region)

In the mountain zones, when to plant corn in Wyoming becomes tricky because the season is so short.
 
Plant between June 1 and June 10, but only if the soil has warmed up sufficiently.
 
Consider using row covers or a cold frame to extend your season, and always choose ultra-early corn varieties that mature in 60 to 70 days.
 
If you’re above 7,000 feet, corn may be a real challenge, so a greenhouse or high tunnel might be your best bet.
 
 

Tips for Success When Planting Corn in Wyoming

Now that you know the general timing, let’s talk about how to make sure your corn actually thrives.
 
Wyoming’s dry air, strong winds, and intense sun can stress corn plants, so a little preparation goes a long way.
 
Here are my top tips for getting a great harvest.
 

1. Use a Soil Thermometer and Plant in Blocks

Always measure your soil temperature before you plant corn in Wyoming, and don’t rely on the air temperature alone.
 
Plant corn in blocks of at least four rows rather than a single long row, because corn is wind-pollinated and needs close spacing.
 
A 10 by 10 foot block will give you much better pollination than a single 30-foot row.
 
 

2. Water Deeply but Infrequently

Wyoming gets very little summer rain, so you’ll need to water your corn consistently, especially during pollination.
 
Water deeply once or twice a week rather than a little bit every day, as this encourages deep root growth.
 
Mulch around the base of the plants to retain soil moisture and keep the roots cool during hot afternoons.
 
 

3. Watch the Weather and Be Ready to Protect

Even after you plant corn in Wyoming, a late frost can still surprise you in early June.
 
Keep row covers or old sheets handy to throw over your corn if frost is forecast.
 
Also be prepared for hail, which is common in Wyoming, and consider using a lightweight row cover or netting for the first few weeks.
 
 

So, When to Plant Corn in Wyoming?

The best time to plant corn in Wyoming is between mid-May and early June, depending on your specific location and soil temperature.
 
Wait until the soil is at least 50°F and the last frost date has passed, and always choose short-season varieties for higher elevations.
 
If you time it right and protect your plants from cold and hail, you can enjoy fresh sweet corn even in the Cowboy State.
 
Remember that when to plant corn in Wyoming is always about watching your soil, not just the calendar, so stay flexible and patient.
 
With a little planning, your corn will have enough warm days to mature before the first fall frost arrives.
 
Happy planting, and may your stalks grow tall and full!