When to Plant Peas in Wyoming (2026 Guide)

Growing peas in Wyoming can be highly rewarding, but it requires careful timing due to the unique climate conditions across the state. For example, the median last spring frost in Zone 5a typically occurs around May 27, which directly influences when you can start planting. Understanding these frost dates is crucial to ensure a successful harvest of this beloved cool-season vegetable.

Peas thrive in cooler weather, making them one of the first crops you can plant as soon as the soil is workable. In Wyoming, where the growing season can be limited, knowing when to sow your peas will help you take full advantage of the local climate. For those in Zone 5b, the median last spring frost arrives even earlier, on May 12, allowing for a slightly extended planting window.

Due to their rapid decline in productivity once temperatures rise above 80°F, it's essential to plant peas early in the season. They need temperatures between 50°F and 70°F for optimal growth. Additionally, the shorter frost-free season in Wyoming means that everything from planting to harvesting must be properly timed to enjoy a bountiful yield of delicious peas.

Planting Schedule by USDA Zone in Wyoming

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 5a	Not recommended — direct sow only.	Not recommended — direct sow only.	Start March 10 – March 25, ~6–8 weeks before May 27.	Late June – early July, approximately 60 days after sowing.
Zone 5b	Not recommended — direct sow only.	Not recommended — direct sow only.	Start February 25 – March 10, ~6–8 weeks before May 12.	Early to mid-July, approximately 60 days after sowing.

Peas Planting Windows in Wyoming

Indoor start: Indoor seed starting is not recommended; instead, direct sow as early as February 25 in Zone 5b or March 10 in Zone 5a.
Transplant outdoors: Transplanting outdoors is not recommended; peas should be directly sown in the garden starting February 25 in Zone 5b and March 10 in Zone 5a.
Harvest: Harvest of peas occurs from early to mid-July, approximately 60 days after the ideal planting dates, varying slightly with the zone.

Common Mistakes Growing Peas in Wyoming

One common mistake made by gardeners in Wyoming is not accounting for the risk of late spring snowfalls. These can happen even in late May, which can harm young pea plants if they are sown too early. Always check local conditions before planting.
Another error is believing that peas can be easily transplanted. In reality, they resent transplanting and perform best when directly sown. Gardeners in Wyoming should be cautious to sow seeds in the right conditions for optimal growth.
Many inexperienced gardeners assume they can wait until the weather warms up. However, for peas, the best results come from planting them early in the spring when temperatures are cool. Delaying until May can lead to poor yields in Wyoming's shorter growing season.
Wyoming's alkaline soils can pose a challenge for many gardeners, including pea growers. It's vital to amend the soil properly before planting to ensure it drains well and supports healthy growth. Testing soil pH can save time and effort during the growing season.
A frequent mistake is neglecting to support pea plants with the appropriate trellis. Leaving the installation of trellises until after planting can result in tangled and damaged vines, limiting your harvest. Installing trellises when sowing will facilitate better growth.

Frequently Asked Questions

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

If you're in a colder area, you may want to wait a week or two after the recommended planting dates. This will help ensure that the soil is warm enough for germination, which is crucial for pea growth.

Can I still plant peas in May?

While you can plant peas in May, it is not ideal. By this time, temperatures may have already risen above what peas prefer, potentially affecting your yield. Aim to plant by late April to maximize the growing season.

How do I know when my soil is workable?

You can test soil workability by grabbing a handful and squeezing it. If it crumbles easily when you open your hand, it's ready for planting. If it sticks together in a ball, it’s too wet to sow seeds.

What should I do after harvesting peas?

After harvesting, be sure to cut the plants at the soil line rather than pulling them out. This leaves the nitrogen-rich roots in the ground, which will benefit subsequent crops planted in the same location.

Are there pests to watch out for?

Yes, watch for aphids and other common garden pests. Regularly inspecting your pea plants helps catch any infestations early. Use insecticidal soap if needed, but make sure it’s safe for edible plants.