When to Plant Okra in Wyoming

Start okra indoors in April and set transplants outside in late May to early June, once the odds of a 32°F freeze have dropped. Wyoming’s last spring frost falls between May 7 and May 18, and its first fall frost between September 24 and October 5. That is a short run for a crop that loves heat. Transplants are the plan, and direct seeding is a gamble.

The short answer for Wyoming

Those frost dates are probabilities, not promises. They come from the NOAA NCEI 1991-2020 Climate Normals for the Cheyenne station, and they mark the 30-70% band of 32°F freeze probability. May 7 to May 18 is the stretch in spring when a freeze is still a real possibility, and September 24 to October 5 is the same stretch in fall. A freeze after May 18 is less likely but not ruled out, and the numbers describe 30 years of records, not this spring.

Between those bands sit roughly 130 frost-free days at 6,000 feet, and frost is possible in any month at higher elevations. Okra wants warm soil and warm nights, so the practical calendar starts later than the frost date. Here is a working schedule built from those numbers.

The transplant dates are my reading of the frost data, not a measured fact, so treat them as a starting point. Seedlings that spend four to six weeks indoors arrive in the garden already weeks into their growth. That head start matters because there is little slack at the back end. Count from your transplant date to the fall band, and you will see why the quickest-maturing types make sense here. The best okra to grow in Wyoming gets its own page, and the main guide to growing okra in Wyoming covers the rest of the season.

On the page’s numbers, season extension is not optional. Row cover, wall-o-water style sleeves or a low tunnel can buy the first two weeks of June and the last two of September. Without them, you are betting the whole crop on the calendar.

What will not work here

Sowing seed straight into the ground on May 18 will not work. That date is the end of the frost band, not a green light. Okra seed rots in cold soil, and seedlings that survive a cool, damp May sit there and sulk. By the time they get going, a good part of the 130 frost-free days is gone.

Slow, tall, long-season okra fares worst. Many of the classic big-plant types need a long stretch of hot weather to start producing pods. Wyoming does not supply that stretch. Cheyenne averages only 10.4 days a year at 90°F or higher, which makes it a mild place for a plant that comes from tropical Africa. Okra shuts down on cold nights, and a plant that is still small in mid-August has little time left before the September 24 to October 5 band arrives.

Watering once a week and hoping also fails. Summer rainfall at the reference station averages about 5.8 inches across June, July and August: 2.16 inches in June, 2.11 in July and 1.52 in August, out of 15.4 inches for the year. August is the driest month, just when okra is trying to set pods. Much of that rain arrives as thunderstorms, and a hard downpour on dry ground runs off more than it soaks in. A sandy bed drains within the day and can need water every couple of days; a clay bed holds moisture longer but sheds a storm’s worth of runoff. Those are normals for one station over 1991-2020, not a forecast. A cheap rain gauge on your own plot will tell you what your garden really receives.

Bare, open beds are a third mistake. Mulch matters more here than in a humid state. A two- to three-inch layer of straw or shredded leaves, laid after the soil has warmed, cuts evaporation without chilling the roots in spring. Laying mulch too early works against you, since it keeps cold ground cold.

One thing the 10.4 hot days do help with is crowding. In a humid summer, tight spacing breeds disease. In a dry climate like this one, plants can sit closer together, which makes a row cover easier to manage. Sun and warmth are what you lack, so give each plant the south-facing, wind-sheltered spot you would pick for tomatoes.

What changes across Wyoming

Wyoming is not one garden. The USDA Plant Hardiness Zone Map (2023 edition, based on 1991-2020 normals) runs from zone 3a to 6a across the state. That is a spread of three full zones, and there is no single answer for the whole state. Hardiness zones rest on one variable only: the average annual extreme minimum temperature. They say how cold winter gets, not how warm July runs, so they are only a rough guide for a summer crop like okra. They still show how much the state varies.

The dates on this page come from Cheyenne, the reference city, at about 6,000 feet. A reader in a colder northern area or a high mountain valley should shift the whole schedule later in spring and plan on an earlier fall end. At higher elevations frost can arrive in any month, so a June transplant needs cover on hand and a July night can still surprise you. In those places, okra may be best grown in a container you can move, or in a greenhouse or high tunnel, rather than in an open bed.

Lower, warmer parts of the state may give you a few extra weeks, but I am not going to name zones or towns the facts here do not support. For your own zone, use the USDA map and look up your ZIP code. It is the only way to avoid guessing. Then compare it with Cheyenne and move the dates in the table above by the difference you see in your local frost dates.

Where to check this for your own county

University of Wyoming Extension is the next stop. It has county offices across the state, and the staff there know the local frost pockets, wind and soil. Look for two things: a planting calendar for your area, and any variety trials run in your county or a similar one.

A county recommendation beats a state one every time, and this page is the state one. It rests on one station’s normals and a state-wide hardiness range. If your county office gives different dates, go with theirs. This page does not have an okra calendar from the extension service, and I have not guessed at one.

Extension calendars are usually organized by crop, not by state, so look for the vegetable or okra listing specifically. A lawn or ornamental schedule will not help you here. If an office has no okra guidance at all, ask what they suggest for warm-season crops such as peppers or tomatoes in your county. Okra follows a similar rhythm, and the answer will tell you when local soils and nights warm up.

Checking this against your own garden

Your own observations outrank every date on this page, and you do not need an instrument for any of them.

• Soil warmth by feel. Push your hand a few inches into the bed in the morning. If the soil feels cool and damp, it is too early. A bed that feels comfortably warm is ready sooner. Check several spots, since a south wall and a shaded corner can differ by weeks.
• First true leaves. After transplanting, watch the new growth. Steady new leaves mean the spot is warm enough. Stalled, yellowing or curling seedlings are telling you the nights are still too cold, or the wind is too hard.
• First flowers. Note the day your plants bloom. Early flowers mean a warm microclimate. Late ones tell you to favor faster varieties next year and to start cover earlier in September.

Write those dates down each year. After two or three seasons, your own notes will be a better calendar than any normal.

The Moon calendar is a separate, older custom: see when to plant okra by the moon, written as tradition rather than fact.

Common questions

Can I direct-sow okra in Wyoming?

It is risky. Soil stays cold past the last frost band of May 7 to May 18, and the season is short. Indoor starts give you a better chance of pods before the fall band.

What are Wyoming’s frost dates for okra?

The last spring frost band is May 7 to May 18, and the first fall frost band is September 24 to October 5. These mark the 30-70% band of 32°F freeze probability from NOAA’s 1991-2020 normals for the Cheyenne station.

Do I need season extension?

Yes. There are roughly 130 frost-free days at 6,000 feet, and frost is possible in any month at higher elevations. Row cover or a low tunnel is part of the plan.

How often should I water okra here?

Summer rainfall averages about 5.8 inches over June to August, with August the driest at 1.52 inches. Soil type decides the rhythm, so check with a rain gauge and the feel of the soil, not a fixed weekly schedule.