When to plant cabbage in Wyoming
Wyoming’s average last spring frost is May 20, and the first fall frost typically arrives around September 15 — about 118 frost-free days (USDA zones 3a, 3b, 4a, 4b, 5a, 6a). Cabbage needs 60–100 days to mature, which fits comfortably within Wyoming's growing season.
Wyoming covers a wide range of climates, so your exact frost dates may differ from the state average by two weeks or more. For dates tuned to your town, use the calendar generator.
When to plant cabbage in Wyoming: the short answer
For a spring planting, plant out Apr 22 – May 9, with seeds started indoors Apr 1 – Apr 15. Seeds germinate in soil from 45 to 85°F.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow cabbage in Wyoming, step by step
- Start seeds indoors (Apr 1 – Apr 15). Sow seeds ½ inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 75°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 6.0 and 7.5. Dig in compost before planting.
- Plant out (Apr 22 – May 9). Space plants about 15 inches apart in rows 30 inches apart. It handles frost well, so it can go out before the last frost date. As a cool-season crop it does best before summer heat arrives in Wyoming.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: cabbage worm, cabbage looper, aphids, cabbage root maggot, flea beetle. Diseases and disorders: clubroot, black rot, downy mildew, fusarium yellows.
- Harvest (from about Jun 28 – Aug 7). Cabbage takes 60-100 days to reach harvest. Tighter spacing (12 in) gives smaller heads better for one meal. Split heads mean it is past ready or got a sudden drink after dry weather.
Figures come from our crop data; dates use Wyoming’s average frost dates. More in the full cabbage growing guide.
Cabbage planting dates by USDA zone in Wyoming
Wyoming spans USDA zones 3a, 3b, 4a, 4b, 5a, 6a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the cabbage dates shift with them.
When to plant cabbage in nearby states
Questions gardeners in Wyoming ask
When is the best time to plant cabbage in Wyoming?
Plant cabbage transplants outdoors in Wyoming between April 22 and May 9. That timing is set by Wyoming's average last spring frost of May 20; Wyoming spans several climates, so cooler and higher parts of the state run later.
When should I start cabbage seeds indoors in Wyoming?
Start seeds indoors between April 1 and April 15, about 6 weeks before the last frost, so the seedlings are ready to plant out from April 22.
Can I plant cabbage in the fall in Wyoming?
Yes. For a fall crop, start transplants between June 6 and June 23, so the crop matures in cool weather before Wyoming's first frost around September 15.
When will cabbage planted in Wyoming be ready to harvest?
Planted on time, cabbage is usually ready from about June 28 to August 7, 60-100 days after transplanting.
When is the last frost in Wyoming?
On average around May 20, with the first fall frost around September 15 - about 118 frost-free days. Your town may differ by two weeks or more.