Cabbage is a reliable winter crop in Zone 9, where autumn-planted heads grow steadily through the cool months and store well after harvest — one of the easiest brassicas to succeed with.
Zone 9 at a glance
USDA Zone 9 covers the warmest parts of the southern United States, including much of Florida, southern Texas, southern Louisiana, southern Arizona and coastal California. Winters are mild, with average winter lows of 20 to 30°F, and the growing season runs nearly all year.
The average last spring frost in Zone 9 is Jan 30–Feb 15, and the average first autumn frost is Dec 1–15. These are zone averages drawn from NOAA frost records, not exact dates for any one garden — always check your local extension service and the forecast before planting tender crops outside. The average last spring frost in Zone 9 is Jan 30–Feb 15, and the average first autumn frost is Dec 1–15. These are USDA zone averages drawn from NOAA frost records, not exact dates for any one garden. Always check your local extension service and the forecast before planting tender crops outside. Use our frost date calculator for your zone's averages.
When to plant cabbage in Zone 9
Transplant seedlings in autumn (September to November) for a winter harvest; a late-winter planting (January to February) also works. The average last spring frost in Zone 9 is Jan 30–Feb 15, and the average first autumn frost is Dec 1–15. Because Zone 9 has a long, nearly year-round growing season, the question is rarely whether cabbage will grow, but whether you plant it in the right season for the crop — heat lovers go in after the last frost, cool-season crops go in for autumn and winter.
Cabbage planting at a glance
| Detail | Zone 9 guidance |
|---|---|
| Best planting window | Transplant seedlings in autumn (September to November) for a winter harvest; a late-winter planting (January to February) also works. |
| Start indoors | Start seed indoors 6–8 weeks before transplanting |
| Direct sow / transplant | Transplant seedlings outdoors September–November |
| Days to germination | 7–14 |
| Days to maturity | 60–90 |
| Spacing | 12–24 in |
| Soil pH | 6.0–7.0 |
| Sun | full sun |
| Water needs | moderate |
| Cold tolerance | frost-tolerant |
All figures are broad published ranges from standard horticultural references, and they vary by variety, soil and weather. Check your local extension service for advice on your own garden.
Starting cabbage
Cabbage seed germinates in 7–14 days. Start seed indoors in late summer for autumn transplanting, or buy transplants. Sow in small pots, pot on once seedlings have true leaves, and harden off for a week before planting out. Set transplants a little deeper than they stood in the pot and firm the soil well — loose plants rock in the wind and heart up poorly. Water in thoroughly at planting. In Zone 9, autumn is the main planting; spring heads must mature before summer heat makes them bolt or split.
Soil, spacing and sun
Cabbage needs full sun and rich, moisture-retentive soil with a pH of 6.0–7.0. Dig in plenty of compost before planting. Space plants 12–24 inches apart depending on variety — small early types closer, large storage types wider. Firm planting matters: plants that wobble grow slowly. Mulch to keep roots cool and moist, and keep the bed weed-free, because young cabbage competes poorly with weeds.
Watering and feeding
Cabbage has moderate water needs, but even moisture matters: drought followed by heavy rain causes heads to split. Water deeply once or twice a week at the base, and mulch to smooth out moisture swings. In Zone 9's dry autumn spells, check the soil weekly. Feed with a balanced fertiliser a few weeks after transplanting. Stop heavy watering as heads firm up, and if a head threatens to split after rain, twist the plant slightly to break some roots and slow water uptake.
Companion planting
Good companions for cabbage are marigolds, basil, onions and lettuce. Onions and aromatic herbs are said to confuse cabbage pests, and lettuce fills the gaps between young plants. Avoid planting cabbage where other brassicas grew last year — clubroot and shared pests build up in the soil. Rotate brassicas to a fresh bed each year. Beans are also poor neighbours for cabbage, so keep them in a different bed.
Pests and problems
The pests to watch for are cabbage worms, aphids, flea beetles and slugs. Cabbage worms are the main problem: green caterpillars that chew leaves and burrow into heads. Check leaf undersides for eggs, hand-pick caterpillars, and cover with fine insect mesh from transplanting for the most reliable control. Aphids cluster on young leaves — wash them off. Slugs are active in wet winter weather; check after rain and keep the bed tidy.
Harvesting and storing cabbage
Harvest cabbage when the head feels firm and solid when squeezed, usually 60–90 days from transplanting. Cut the head at the base with a sharp knife, leaving the stump: in Zone 9 it often sprouts small secondary heads that are worth picking. Do not leave mature heads standing through heavy rain — they split. Cabbage stores well: keep whole heads in a cool place for weeks, or in the fridge for a month or more. It also freezes well after blanching, and makes excellent sauerkraut.
Frequently asked questions
When should I plant cabbage in Zone 9?
Transplant seedlings in autumn, September to November, for a winter harvest, with a second chance in late winter. Cabbage is a cool-season crop in Zone 9 — summer planting bolts. Check your local extension service for the best dates in your area.
Why did my cabbage split?
Uneven watering — drought followed by heavy rain or watering makes the inner leaves grow faster than the outer ones and the head splits. Water evenly, mulch well, and harvest promptly once heads are firm.
Why didn't my cabbage form a head?
Usually heat, crowding or poor soil. Cabbage needs cool weather, full sun, rich soil and enough space. Plants set out too late in spring often bolt instead of heading in Zone 9 heat.
How long does cabbage take to grow in Zone 9?
Seed germinates in 7–14 days and heads mature in 60–90 days from transplanting, so autumn-planted cabbage is typically ready in winter.
For the full year, browse the planting calendar hub. Nearby: october in Zone 9, Cabbage in Zone 7 and Kale in Zone 9. Use the seed-starting calculator and the vegetable yield estimator to plan your own dates.