When to Plant Potatoes in Wyoming (2026 Guide)

If you're planning to grow potatoes in Wyoming, understanding the timing of frost dates is crucial. In regions like Cheyenne, the median last spring frost occurs around May 12, meaning it's essential to plant your seed potatoes early enough to ensure a successful crop. Potatoes are generally planted in early spring, allowing you to take advantage of the cooler soil temperatures that encourage tuber development.

In Wyoming, you can enjoy a productive potato harvest with the right planning. In areas with a median last frost date of May 27, like Casper and Gillette, you'll want to start your indoor seed potatoes a bit earlier and carefully manage their outdoor transplanting. With a growing season of about 115 to 137 days across the state, you can expect a satisfying yield with proper care.

Choosing the right variety for your area is also important. Potatoes offer a wide range of choices for flavor and use. From starchy Russets to waxy Yukon Golds, knowing which types thrive in Wyoming's unique climate can make all the difference, ensuring a bountiful harvest ready by the time the first fall frost arrives on September 19.

Planting Schedule by USDA Zone in Wyoming

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5a	Start February 15 – March 1, ~6 weeks before May 27	Transplant outdoors May 27 – June 10, ~1–3 weeks after last frost	Direct sow late April – May 27, avoiding heavy frost risk	Harvest September 19 – October 5, just after the first frost
Zone 5b	Start February 15 – March 1, ~6 weeks before May 12	Transplant outdoors May 12 – May 27, ~1–3 weeks after last frost	Direct sow late April – May 12, avoiding heavy frost risk	Harvest September 26 – October 10, a bit after first frost

Potatoes Planting Windows in Wyoming

Indoor start: Start your seed potatoes indoors between February 15 and March 1 for best results.
Transplant outdoors: Transplant your potatoes outdoors from May 12 to May 27, after the last expected frost.
Harvest: Plan to harvest your potatoes between September 26 and October 10, just after the first frost.

Common Mistakes Growing Potatoes in Wyoming

One common mistake in Wyoming is planting potatoes too early without considering residual frost risks. Late spring snow can still surprise gardeners. Always wait until the frost risk has truly passed before planting outdoors.
Another issue is using grocery store potatoes instead of certified seed potatoes. Grocery potatoes may carry diseases that persist in Wyoming soils, jeopardizing future crops. Always choose disease-free seed potatoes for a healthy garden.
Many gardeners overlook the importance of hilling their potato plants as they grow. Hilling is crucial in Wyoming's climate, where soil temperature impacts tuber development significantly. Failing to hill properly can result in smaller yields.
In Wyoming's alkaline soils, neglecting to amend the soil before planting can hinder potato growth. Potatoes thrive best in well-draining, slightly acidic to neutral soils. Test your soil and make adjustments as necessary for optimal results.
Another mistake is not paying attention to the variety of potatoes planted based on climate. Not all potatoes thrive in Wyoming's unique conditions, so selecting varieties compatible with your local environment is essential for success.

Frequently Asked Questions

What if I'm in a cold pocket of Wyoming?

If you're located in a colder area, consider starting your potatoes indoors a bit earlier. You can also utilize protective measures, like row covers, to shield young plants from unexpected cold snaps.

Can I still plant potatoes in May?

Yes, planting in May can be successful if you choose your dates carefully. Ensure you've passed the last frost date for your area, which is around May 12 in some parts of Wyoming, like Cheyenne.

How can I tell when my potatoes are ready to harvest?

Harvest when the foliage of your potato plants has died back and turned yellow. Wait an additional two to three weeks to allow the skins to set, which improves storage quality.

What types of potatoes grow best in Wyoming?

Varieties that mature quickly, such as Red Bliss and Yukon Gold, tend to thrive in Wyoming's unique climate. Ensure to select disease-resistant options that fit your growing season and local conditions.

Is there a risk of late frost affecting my crop?

Yes, there's always a risk of late frosts in Wyoming, particularly until the median last frost date of May 12. It's crucial to monitor weather forecasts and consider protective measures for young plants.