Turnips are an underrated Zone 10 winter crop: fast, easy and two crops in one, with sweet roots and nutritious greens from the same planting. They thrive in cool weather and shrug off the light frosts that Zone 10 occasionally sees.
Zone 10 at a glance
USDA Zone 10 covers the warmest parts of the United States, including southern Florida, the southern tip of Texas, coastal southern California and Hawaii. Winters are mild, with average winter lows of 30 to 40°F, and the growing season runs nearly all year — frost is rare rather than a regular event.
The average last spring frost in Zone 10 is Jan 15–30 (frost rare), and the average first autumn frost is Dec 15–31 (frost rare). 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. Frost dates vary by microclimate, elevation and year, so treat them as a guide, not a promise. Use our frost date calculator for your zone's averages.
When to plant turnips in Zone 10
Plant turnips from October to February in Zone 10, sowing seed directly. Turnips are hardy and grow best in cool weather; roots sweeten after cool nights and turn woody in heat, so autumn and winter sowings give the best eating. Roots mature 40–60 days after sowing, and greens can be picked sooner. Because Zone 10 has a long, nearly year-round growing season, the question is rarely whether turnips will grow, but whether you plant them in the right season — heat lovers go in after the last frost, cool-season crops go in for autumn and winter.
Turnips planting at a glance
| Detail | Zone 10 guidance |
|---|---|
| Best planting window | October to February |
| Start indoors | Not needed — direct sow |
| Days to germination | 7–10 |
| Days to maturity | 40–60 |
| Spacing | 4–6 in |
| Soil pH | 6.0–7.0 |
| Sun | full sun |
| Water needs | moderate |
| Cold tolerance | hardy |
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 turnips
Sow turnips directly — they dislike transplanting and the taproot is easily damaged. Sow seed about half an inch deep in rows and thin seedlings to their final spacing once they have true leaves; the thinnings make good cooking greens, so nothing is wasted. Seed germinates in 7–10 days. Sow small batches every few weeks for a steady supply, and keep the seed bed damp until seedlings are up. In Zone 10's mild autumn, germination is quick and reliable.
Soil, spacing and sun
Turnips need full sun and loose, fertile soil with a pH of 6.0–7.0. Work the bed deeply and remove stones, which cause forked roots. Space plants 4–6 inches apart in rows — wider spacing suits varieties grown for roots, while greens types can be sown more thickly. In Zone 10's sandy soils, compost holds moisture and improves root shape. Avoid fresh manure, which encourages forked roots and leafy tops.
Watering and feeding
Turnips have moderate water needs and grow best with even moisture: dry soil gives woody, strong-flavoured roots, while a dry spell followed by heavy watering can split them. Water deeply and regularly, and mulch to hold moisture through Zone 10's dry winter spells. Roots grown with steady water are mild and sweet; roots grown dry are hot and tough. Water at the base to keep leaves dry.
Companion planting
Good companions for turnips are marigolds, basil, onions and lettuce. Turnips fit well between slower crops and at the edges of beds, and they are often grown with peas and beans, which fix nitrogen that turnips use. Avoid planting turnips where other brassicas grew last year — rotate them to fresh ground to keep clubroot and other soil problems down. Do not crowd them with other root crops competing for the same soil.
Pests and problems
The pests to watch for are cabbage worms, aphids, flea beetles and slugs. Flea beetles riddle young leaves with holes but rarely kill established plants; covering the bed with insect netting from sowing keeps them off. Cabbage white caterpillars chew the leaves, and slugs work on damp nights. Root maggots can tunnel into roots in some areas. Because turnips grow fast, most are harvested before pests become serious, and the roots are usually fine even when the leaves show some damage.
Harvesting and storing turnips
Harvest turnips when roots are the size of a golf ball to a tennis ball, 40–60 days after sowing — young roots are sweet and tender, while oversized roots turn woody and strong. Pull gently after loosening the soil with a fork, twist off the tops, and use the greens as well as the roots. Turnips store for weeks in a cool place or in the fridge, and they keep their flavour well in soups and stews. Pick greens while they are young and tender.
Frequently asked questions
When do I plant turnips in Zone 10?
From October to February, sown directly. They are a cool-season crop — check your local extension service for the best dates in your area.
Are turnip greens edible?
Yes, and they are nutritious. Pick young outer leaves for salads or cook mature greens like other leafy greens. Take only a few leaves per plant so the root keeps growing.
Why do my turnips taste strong and woody?
Usually heat or drought. Turnips grown in hot, dry conditions turn strong and woody. Sow in the cool months and keep the soil evenly damp.
How long do turnips take to grow in Zone 10?
Seed germinates in 7–10 days and roots mature in 40–60 days.
For the full year, browse the planting calendar hub. Nearby: november in Zone 10, Turnips in Zone 9 and Beets in Zone 10. Use the seed spacing calculator and the harvest date calculator to plan your own dates.