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Vegetable Crop Calendars (A–C)Bok Choy Planting Calendar
Bok choy is a quick cool-season green that bolts easily, so the best calendar leans on late summer and fall, with a careful early spring planting as a second chance.
Key points
- Bok choy bolts in response to cold snaps and long, hot days.
- Fall is often the more reliable season.
- Transplants can reduce the risk of early bolting in spring.
- Keep moisture even and cover against flea beetles.
- Count back from first frost for fall sowings.
Why does bok choy bolt?
Bok choy is a Chinese cabbage relative that responds strongly to temperature and day length. Cold snaps early in the plant's life and long, warm days can both push it to send up a flower stalk. Once that starts, the leaves turn bitter and the plant is done.
This is the main reason gardeners get better results in fall than in spring in many places. Extension guides for Chinese cabbages describe this behavior and suggest times and varieties for each season.
A simple observation helps. If your plants bolt at the same point each spring, write down the date and the weather. Over time you will see whether cold nights, hot days or both are the trigger in your garden, and you can shift your planting date to avoid that stretch.
When should you plant in spring?
If you plant in spring, aim for an early sowing or transplant when the soil is workable and the worst cold has passed, so the crop matures before the days get long and hot. Many gardeners set out transplants rather than seeding, because young plants chilled for long periods may bolt prematurely.
Choose bolt-resistant varieties where they are available. Check your state guide for the lead time before the last frost and the variety list for your area.
Another trick is to grow baby-sized bok choy. Harvesting small plants early means you collect leaves before bolting becomes a risk, and it works well with repeated small sowings. Keep a few transplants in reserve. If an early cold spell hits, a second planting set out a week or two later may mature just as well and miss the chill.
When is the best fall window?
Count backward from your average first fall frost. Bok choy matures quickly, often within several weeks for small types, but growth slows as days shorten. Plan your sowing so plants reach harvest size before hard freezes, and give yourself some cushion.
For example, if your first frost usually falls in late October, you would plan sowings in late summer and early fall, adjusting for how fast your weather cools. Those dates illustrate the method only.
Gardeners in warm-winter regions often shift the whole schedule toward the cooler months and treat winter as the main season. Gardeners in cold regions may have a shorter window and rely on cover or a cold frame to stretch it.
- Find your first fall frost date.
- Check the days to maturity for your variety.
- Add extra days for slower growth in fall.
- Sow in small batches to extend the harvest.
How do you keep it growing evenly?
Even moisture and steady fertility keep the plant tender. Dry spells make leaves tough and push plants toward flowering. Mulch to hold moisture and moderate soil temperature, and irrigate on a schedule that fits your local water rules.
A soil test tells you whether you need lime or fertilizer. Follow local recommendations, because nutrient management rules vary by state.
Shade cloth over a late summer bed can lower the heat for seedlings and help germination when the soil is still warm. Remove it as nights cool so plants are not stretched and weak.
What pests bother bok choy?
Flea beetles, cabbage worms and slugs are frequent problems in this crop family. A floating row cover installed at planting is a common barrier. Scout regularly, and ask your extension office what is active in your area.
If you consider a pesticide, read the label closely, follow the pre-harvest interval, protect pollinators, and check whether your state requires an applicator license.
Slugs often hide under mulch and boards during the day. Checking in the evening and removing hiding places near the bed is a simple, label-free first step.
What are the most common planting mistakes?
The most frequent are planting too late in spring, letting seedlings get chilled for long stretches, crowding plants and letting the soil dry. Another is leaving mature plants in the garden during a warm spell, which invites bolting.
Keep notes on when you planted and when bolting began. Over a couple of seasons, you will find the window that fits your garden.
Rotation helps with pests and disease in this family. Avoid planting bok choy in the same bed as other brassicas in consecutive seasons, and ask your extension office how long a rotation is suggested in your area.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.