Zone 8 gives turnips a long season, but only if the planting date respects the frost calendar. Average winter lows are 10 to 20°F, the last spring frost averages Mar 1–15, and the first autumn frost averages Nov 15–Dec 1 — a long frost-free stretch in an average year. All of these are USDA/NOAA averages, not exact dates for a particular garden, so use your local extension service to confirm the dates for your own spot.
Zone 8 at a glance
In Zone 8, winter lows average 10 to 20°F and the growing season runs from the last frost (Mar 1–15) to the first frost (Nov 15–Dec 1). Turnips needs 40–60 days to maturity and is hardy. The planting calendar hub gives the full Zone 8 picture, and the frost date calculator can work from your own local averages.
| Detail | Zone 8 guidance |
|---|---|
| Average last spring frost | Mar 1–15 (average/range) |
| Average first autumn frost | Nov 15–Dec 1 (average/range) |
| Winter low | 10 to 20°F |
| Days to germination | 7–10 days |
| Days to maturity | 40–60 days |
| Sowing | Direct sow Feb–Mar; autumn sow Aug–Sep |
| Transplanting | Direct sow only |
| Harvest | 40–60 days after sowing; spring harvest Apr–May, autumn Oct–Nov |
| Sun | full sun |
| Soil pH | 6.0–7.0 |
| Spacing | 4–6 inches |
| Water needs | moderate |
When to plant turnips in Zone 8
Turnips are a fast, cool-season root crop that does well in Zone 8 in spring and, better still, in autumn. Sow direct from February into March for a spring crop, and again from August into September for roots that mature in the cool of autumn — light frost sweetens turnips, so the autumn sowing is often the best. Germination takes 7–10 days, and roots are ready in 40–60 days. Avoid sowing in summer, when heat makes roots woody and the plants bolt. In Zone 8, turnips are a two-window crop, with the autumn window the one to prioritise. The Seed Spacing Calculator turns your frost averages into sowing dates — see also Zone 8 February for what else is happening in the garden that month.
Starting turnips in Zone 8
Sow seed direct, about half an inch deep, and thin seedlings to their final spacing once they are a couple of inches tall. Keep the seedbed moist until seedlings appear, and water steadily as roots swell — drought makes roots woody and strong-flavoured. Turnips give two crops in one: the roots and the young leaves, which are edible as greens. Thin ruthlessly: crowded turnips stay small.
Soil, spacing, sun and water
Site matters as much as timing. Choose the sunniest spot you have — full sun — and check the soil pH is in the 6.0–7.0 range. Space plants 4–6 inches apart so each plant gets its share of light and air. Turnips needs moderate water: keep the soil evenly moist, water deeply at the base in the morning so leaves dry before night. Mulch after planting to hold moisture and keep soil off the leaves. Turnips like a light, well-drained soil with a pH of 6.0–7.0 and plenty of compost. They tolerate poorer soil than most root crops, but they still need steady moisture. A mulch helps hold water through dry spells in spring.
Companion planting
Companion planting for turnips is simple: marigolds, basil, onions, lettuce are all good neighbours. Planting turnips near marigolds — see Zone 8 Radishes — can help you plan a bed that uses the season well. Turnips grow well with marigolds, basil, onions and lettuce, and they fit neatly between slower crops such as brassicas. Rotate root crops to a fresh bed each year, and keep turnips away from other brassicas in the same season if space allows, since they share pests. What matters most is rotation — do not grow turnips or its Brassicaceae relatives in the same bed year after year.
Pests and problems
Turnips is not trouble-free, and the usual suspects are cabbage worms, aphids, flea beetles, slugs. Cabbage worms chew holes in leaves, and flea beetles pepper young plants with small holes — cover rows with fleece if they are a problem. Aphids and slugs also attack, especially in damp weather. Healthy, well-spaced plants in good soil resist pests better than stressed ones. Healthy, well-spaced plants in good soil resist pests better than stressed ones, so spacing, watering and rotation are your first line of defence. Inspect leaves weekly, hand-pick larger pests and wash small ones off with water.
Harvest and storage
Pull turnips when roots reach a useful size for the variety — young and tender is better than big and woody. Spring-sown turnips are usually ready 40–60 days after sowing. Twist off the tops, store roots in a cool place, and cook the young leaves as greens. Autumn-sown roots can stay in the ground into early winter in Zone 8, protected by a mulch, and they taste sweeter after a light frost. The Zone 7 Turnips page shows how the same crop behaves in a shorter season.
Frequently asked questions
When should I plant turnips in Zone 8?
Sow direct from February into March for spring, and again from August into September for autumn. Turnips are hardy and need 40–60 days to maturity — check your local extension service for your own dates. Light frost sweetens the roots.
Is autumn or spring better for turnips in Zone 8?
Autumn is usually better. Roots form in cooling soil and taste sweeter after a light frost, while spring roots must mature before summer heat makes them woody.
How far apart should I space turnips in Zone 8?
Thin seedlings to 4–6 inches apart, in full sun and soil with a pH of 6.0–7.0. Thin ruthlessly — crowded turnips stay small — and keep the bed evenly moist.
Can I eat turnip leaves?
Yes — young turnip leaves are edible as greens and are part of the crop. Pick the outer leaves while roots are still growing, and cook them like other leafy greens.
What pests affect turnips in Zone 8?
The most common are cabbage worms, aphids, flea beetles and slugs. Inspect leaves weekly, hand-pick caterpillars, and cover young rows with fleece if flea beetles are a problem.