Sow Asian greens in West Virginia twice a year: in early spring, a few weeks before the last frost, and again from early August into early September so they mature in cooling weather. Skip the summer months, when heat and long days push them to bolt. At the Charleston reference station, the last spring frost falls between April 9 and April 23, and the first fall frost between October 18 and November 1. Higher ground freezes earlier in fall.
The short answer for West Virginia
The frost dates come from NOAA’s 1991-2020 Climate Normals for Charleston. Each range is the stretch of days when the chance of a 32°F freeze sits between 30 and 70 percent. A date inside that band is a coin flip, so treat it as the middle of a risky stretch. Asian greens suit this calendar because most of them, from bok choy and tatsoi to mizuna and komatsuna, take a light frost in stride. If you are new to the crop, Growing Asian Greens in West Virginia covers the basics beyond timing.
When do you sow Asian greens in spring in West Virginia?
Start as soon as the soil can be worked without turning into a muddy ball, which in the Charleston area usually means mid-March. Seeds germinate in cool soil, and the seedlings handle a light frost. A sheet of floating row cover over the bed adds a few degrees on the sharpest nights.
Keep sowing in short rounds every week or two through mid-April, then make one last small sowing in late April. After that, warm weather arrives fast. Plants sown in May reach harvest size just as the days lengthen and the heat builds, and they run to flower instead of making leaves.
When do you sow Asian greens in fall in West Virginia?
Fall is the better season for most Asian greens. The plants grow into shortening days and cool nights, and the same weather that makes spring crops bolt now keeps them sweet. Baby leaves of mizuna, tatsoi and mustard can be cut about a month after sowing. Full heads of bok choy take a good stretch of the season from sowing, and growth slows noticeably in October. Counting back from the October 18 to November 1 band, that puts heads in the ground by mid-August and baby leaves as late as mid-September.
| Sowing | Window at the Charleston reference station | What to grow |
|---|---|---|
| Early spring | Mid-March to mid-April, a last small round in late April | Bok choy, tatsoi, mizuna, komatsuna, mustard greens |
| Summer | Skip it | Wait for fall |
| Fall | Early August to early September, baby leaves into mid-September | All of the above, plus heading types such as napa cabbage |
What will not work here
The most common failure is waiting. Gardeners who hold off sowing until after the last frost date, April 9 to April 23 at Charleston, give up the cool weeks that Asian greens depend on. Spring warms quickly, and a bed sown in late April is already racing the heat by early June. Sow earlier and accept that a late freeze may nip a few seedlings. Seed is cheap, and a second sowing a week later makes up for the loss.
Summer sowing fails for a similar reason. Long days and warm nights trigger bolting in nearly every Asian green, and the leaves turn bitter and tough as the flower stalk rises. Flea beetles, which chew small holes in the leaves of cabbage-family crops, are also busiest through the warm months. A July planting of bok choy is a bet against both, and the odds are poor. Wait for August.
Humid summers cause a different problem, which is crowding. West Virginia air stays damp through the growing season, and leaves that touch each other stay wet for hours after rain. That invites downy mildew and slugs. Full-size bok choy does best with room between plants, and even baby-leaf rows benefit from a thinning once the seedlings crowd. Water at the base, in the morning, so foliage dries before evening.
Leaving greens in the open all winter does not work either. The mean daily minimum of the coldest month at Charleston is 26.1°F. Since that is an average, plenty of nights run colder, and the valley is the mild end of the state. Bok choy and napa cabbage are damaged well before the thermometer reaches the teens, and even the hardier mizuna and tatsoi need a cold frame or low tunnel to carry through January. Plan to harvest most of the crop in the fall, and treat any winter survival under cover as a bonus.
The slowest types also struggle. Napa and other heading Chinese cabbages need a long stretch of mild weather to form a firm head. A spring sowing rarely gets it, because heat arrives before the head fills. Fall is their season, and they go in at the early edge of the window, early to mid-August. For help matching types to your timing, see The Best Asian Greens for West Virginia.
Finally, a calendar copied from the valley fails on a ridge. The reference station sits in a river valley, and higher elevations freeze noticeably earlier in fall. A mid-September sowing that works in Charleston may never reach harvest size in the mountains.
What changes across West Virginia
The state does not have a single hardiness zone. The USDA Plant Hardiness Zone Map (2023 edition, built on 1991-2020 data) places West Virginia anywhere from zone 5a to 7a. That is a spread of three full zones. The system rests on one variable, the average annual extreme minimum temperature, so it describes how cold the worst winter nights get. It says less about frost dates, but the two usually move together, and colder zones tend to freeze earlier in fall and thaw later in spring.
For a reader in the northern part of the state or at altitude, that points to two shifts. Move the spring start later, since soil thaws and dries out later, and move the fall sowing earlier so plants reach size before the first hard freeze. Start fall sowings a couple of weeks ahead of the Charleston dates as a rough guide, and let your county office refine it.
Local terrain matters as much as the zone. Cold air drains downhill on clear nights and pools in hollows and low corners of a yard. A bed at the bottom of a slope can frost before one 30 feet higher, and a south-facing bed against a wall can stay frost-free days longer than an open one. In the southern and lower-elevation parts of the state, the valley dates are a fair starting point, though still not a promise.
To see where your own location falls, use the USDA Plant Hardiness Zone Map and enter your ZIP code. Your zone is one number from that map, so look it up there instead of guessing from a neighbor’s garden.
Where to check this for your own county
West Virginia University’s extension network is the next stop. West Virginia University Extension has an office in or near every county, staffed by agents who see local frost dates, soil and pest pressure year after year. Contact the office for your county, or browse the gardening resources on the main site.
Ask for two things. The first is a local planting calendar, ideally one that gives average last and first frost dates for a town near you, not for Charleston. The second is a list of the varieties that have been grown and watched in your county or a similar one. Trial results tell you which bok choy held up through a wet summer, or which mustard bolted early, in conditions close to yours.
A county recommendation beats a state one. Everything above is a state-level timeline anchored to a single river-valley city, and a county agent knows the local ground better than any statewide calendar can. If the county office’s dates differ from the ones here, follow the county.
Checking this against your own garden
Your own observations outrank every date above. Two of them are easy to make without any equipment.
Soil warmth by feel. Push your bare hand a couple of inches into the bed. If it feels cool but not cold, and the soil crumbles instead of clumping, it is ready for the first sowing. A bed that reaches that point a week or two before your neighbor’s, usually one facing south or sheltered by a wall, is telling you it is a warm spot. You can start there first.
First true leaves. The first pair of leaves on a seedling are seed leaves. The true leaves come after, with the shape of the mature plant. If true leaves show up while the seedlings are still small, the bed is doing its job. If they hang back for much longer, the soil is still cold or soggy, and later sowings should wait. Do the same in fall. Seedlings that stall before true leaves in October were sown too late for that spot.
Jot the dates in a notebook for a season or two. Three years of your own entries will tell you more than any chart.
Common questions
Can I sow Asian greens in July in West Virginia?
You can, but most will bolt before they make a harvest, and the leaves turn bitter in the heat. A better plan is to wait until early August, when temperatures begin easing and the days start to shorten. Shade cloth can help a little in a pinch, but fall sowings do better.
Do Asian greens survive a West Virginia winter?
Some of the hardier types, like mizuna and tatsoi, can survive under a cold frame or low tunnel. In the open, the coldest nights damage most Asian greens. Charleston’s coldest month has a mean daily minimum of 26.1°F, and the mountains run colder, so do not count on unprotected plants.
How early can I sow in spring?
Once the soil is workable, which is often mid-March near Charleston and later at altitude. The seeds tolerate cool soil, and seedlings handle a light frost. Keep row cover handy in case of a hard freeze, and sow again a week or two later as a backup.
Should I start Asian greens indoors or sow them in the ground?
Direct sowing works well for nearly all of them and avoids transplant shock. Starting indoors can help in spring, especially for heading types like napa cabbage, if you want to get a head start. In fall, sowing directly in the bed is simpler, since the soil is warm and germination is fast.