When to Plant Potatoes in Wyoming
Published: April 24, 2026
Wyoming gardeners in Zone 6a have a 31-week growing season for potato (March 30 to November 1). Wyoming's spring and fall windows both work well for potato — some gardeners plant both successions for a long harvest. This guide gives exact dates for Wyoming based on your local frost calendar.
Potato Planting Dates for Wyoming
| Start seeds indoors | Year-round |
| Last frost (average) | March 30 |
| Direct sow outdoors | March 9–19 |
| Expect first harvest | May 18 – July 7 |
| First fall frost (average) | November 1 |
⚠ Plant seed potatoes 2–4 weeks before last frost when soil is workable and above 45°F. Hill soil up around stems as plants grow. Needs well-drained, loose soil.
Growing Potatoes in Wyoming's Climate
Wyoming's moderate Zone 6a climate is well-suited to potato with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your potato harvest significantly in Wyoming. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common potato pests to watch for in Wyoming include Colorado Potato Beetle and Wireworm. The first line of defense is companion planting: Bean and Corn planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Potato Garden Calendar for Wyoming
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | — | Dormant season |
| March | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 12 inches apart |
| April | — | Dormant season |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Dormant season |
| July | — | Dormant season |
| August | — | Dormant season |
| September | — | Dormant season |
| October | — | Dormant season |
| November | First frost approaches | Harvest remaining potato; cover plants on frost nights |
| December | — | Dormant season |
Potato Growing Tips for Wyoming Gardeners
- •Cut seed potatoes into 2-inch chunks with at least two eyes each, then let cut surfaces heal for 24–48 hours before planting.
- •Plant 4 inches deep and 12 inches apart in loose, well-drained soil; add compost but avoid fresh manure.
- •Wyoming's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Hill up soil around stems when plants reach 6 inches tall to cover developing tubers and prevent green potatoes.
Companion Planting for Potatoes in Wyoming
In Wyoming's moderate climate, planting potato with Bean and Corn helps deter pests and improve soil. Avoid planting near Tomato and Pepper, which inhibit potato growth through root chemistry or shared pest pressure. See the full potato companion planting guide for the complete list.
Frequently Asked Questions
When should I plant potato in Wyoming?
In Wyoming (Zone 6a), start potato seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of March 30.
What is the last frost date in Wyoming?
Wyoming's average last frost date is March 30 in the state's most common Zone 6a. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow potato year-round in Wyoming?
potato is a cool-season crop in Wyoming, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What potato varieties grow best in Wyoming?
For Wyoming's Zone 6a, consult a local nursery or extension office for potatoes variety recommendations.
When do I start potato seeds indoors in Wyoming?
Potato does not need indoor starting in Wyoming — direct sow around March 9–19 once soil reaches 45°F. Indoor starting is not recommended for this crop because potato transplants poorly.