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Vegetable Crop Calendars (A–C)Brussels Sprouts Planting Calendar
Brussels sprouts are slow and patient, and they reward growers who start early enough to let the plant finish in cool autumn weather.
Key points
- Brussels sprouts need a long season, so start early.
- Count back from first fall frost using days to maturity plus a margin.
- Protect summer transplants with water, mulch and shade.
- Pick from the bottom of the stalk as sprouts firm up.
- Use your state guide to confirm varieties for your area.
How long do Brussels sprouts take to grow?
Most varieties need a long season from transplant to harvest, longer than broccoli or cabbage. Look at the days to maturity on your seed packet and treat it as a minimum. Sprouts form along the stalk in the cool weeks of fall, and the plant needs time to grow a strong stalk first.
That long timeline is why this crop causes more trouble in short-season places than in mild ones. Your extension guide for your state will tell you whether it is a good fit and which varieties to try.
If you are unsure about your site, try a few plants first. A small trial planting in one season teaches you more about your garden's timing than any chart will, and the cost of a failed trial is small.
When do you start seed and set out transplants?
Gardeners in many regions start seed indoors or in a protected bed in late spring or early summer and set transplants out in summer. The exact timing comes from counting back from your first fall frost, using days to maturity plus some extra time for slower growth as days shorten.
For example, if your first hard frost usually falls in late autumn, you would count back by the number of days your variety needs and then add a margin. Treat this as a method and check local numbers.
Where winters are mild, some gardeners plant in late summer for a winter harvest. Where winters are severe, harvest is generally planned before deep cold. Write the numbers on paper before you buy seed. Days to maturity, minus nothing, plus a margin of a couple of weeks, subtracted from your first frost date gives your latest realistic transplant date. If that date has already passed, wait for next year rather than planting a crop that cannot finish.
- Find the days to maturity for your variety.
- Count back from your average first fall frost.
- Add a margin for slow fall growth.
- Start transplants so they are ready for the garden at that date.
How do you get transplants through summer heat?
Young plants set out in hot weather need help. Water deeply and regularly, mulch, and consider temporary shade for the first week. Heat stress early in life can stunt the plant, and a stunted plant forms fewer sprouts.
Space plants generously, because crowding reduces airflow and sprout size.
Water at the base in the morning so foliage dries quickly. Wet leaves in warm weather invite disease in dense plantings.
What soil conditions help the stalk grow?
Brussels sprouts want fertile, well-drained soil and consistent moisture. A soil test is the best place to begin, and your extension office can interpret it. Fertilizer timing matters for a long-season crop, and extension guides often recommend splitting applications during the season. Follow local recommendations, because nutrient rules vary by state.
Firm soil around the base helps the tall stalk stay upright, and some gardeners stake in windy sites.
Because the crop sits in the ground so long, soil moisture and fertility have more time to go wrong. Check the bed weekly, and keep a note of when you last watered and fed.
When should you harvest?
Pick from the bottom of the stalk upward as sprouts reach a usable size and feel firm. Some growers remove the lower leaves to help sprouts size up, though guidance varies, so consult your state guide. Cool weather improves flavor, and a light frost is often described as helpful.
Many extension guides mention topping the plant late in the season to direct energy to sprouts. Check the timing in your local guide.
Sprouts that start loose often stay loose, so remove any that look open or yellow while you are in the garden, and keep picking so the stalk keeps working.
Which problems should you watch for?
Cabbage worms, aphids and loose, blown sprouts are the common complaints. A floating row cover is a simple barrier early in the season, and regular scouting catches problems while they are small. Loose sprouts often follow heat stress or uneven nutrition.
If you ever apply a pesticide, the label is the law. Observe the pre-harvest interval and protect pollinators, and check your state's rules on applicator licensing.
Rotate this crop with non-brassicas, because pests and diseases that favor cabbage-family plants build up in beds used for them year after year.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.