Red potatoes are the waxy, thin-skinned potatoes for salads, roasting and boiling whole — they hold their shape where a floury russet would fall apart, and their flavour is at its best eaten fresh. Zone 8 suits them well: an early spring planting gives new potatoes by early summer, and a second August planting can carry the harvest into autumn. This guide covers when to plant red potatoes in Zone 8 and how to grow a clean, scab-free crop.
Zone 8 at a glance
Zone 8 covers parts of the southern United States, the Pacific Northwest coast and parts of California, where average winter lows run 10 to 20°F. The average last spring frost falls Mar 1–15 and the average first autumn frost Nov 15–Dec 1. Those are USDA zone averages drawn from NOAA frost records, not exact dates for any one garden — frost dates vary by microclimate, elevation and year, so always check your local extension service and the forecast before planting. Use the frost date calculator for your own averages, and browse the planting calendar hub for the full Zone 8 year.
When to plant red potatoes in Zone 8
| Step | Timing in Zone 8 |
|---|---|
| Plant seed potatoes | February to March, 2 to 4 weeks before the last frost |
| Second planting | August, for an autumn crop |
| Sprouting (chitting) | 2 to 3 weeks before planting, in a cool bright place |
| New potatoes | May to June, once flowers appear |
| Main harvest | June to July for the spring crop; November for the autumn crop |
Red potatoes are frost-tolerant, so plant a few weeks before the average last frost of Mar 1–15 — the tubers are safe underground and emerging shoots can be earthed up if a late frost threatens. The Zone 8 February guide marks the main planting window, with August for a second crop. Use the harvest date calculator to work out dates for your own garden.
How to start red potatoes
Use certified seed potatoes, not supermarket ones, which can carry disease. Chit them for 2 to 3 weeks before planting in a cool, bright place, eyes up. Cut large tubers into pieces with at least two eyes each and let the cuts dry for a day or two before planting. Set them 4–6 inches deep, eyes up, spaced 12 inches apart in a trench, and cover with soil.
Soil, spacing and sun
Red potatoes need full sun and loose, fertile, well-drained soil so the tubers can swell without hitting compaction. Fork the bed deeply, work in compost, and aim for a slightly acid soil pH of 5.0–6.0; avoid fresh manure, which encourages scab on the thin skins. Space plants 12 inches apart in rows about 3 feet apart. Hill soil up around the stems as they grow — this both protects tubers from light and gives them room to form.
| Fact | Range |
|---|---|
| Sun | full sun |
| Days to germination | 14–28 |
| Days to maturity | 90–120 |
| Spacing | 12 in |
| Soil pH | 5.0–6.0 |
| Sowing method | direct sow |
| 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.
Watering and feeding
Water moderately and evenly, especially from flowering onwards, when tubers are sizing up. A deep soak once or twice a week is better than light daily watering, and mulch with straw to keep the soil cool and moist through Zone 8's warm spring. Ease off as the tops die back so the skins set before harvest.
Companion planting
Marigolds, basil, onions and lettuce are good companions in the potato bed. Keep potatoes away from tomatoes, peppers and eggplant, which share their diseases, and away from raspberries and pumpkins. Rotate to fresh ground every year and never follow tomatoes with potatoes in the same bed. The companions listed for red potatoes in standard references are marigolds, basil, onions, lettuce.
Pests and problems
Look out for aphids, hornworms, flea beetles and whiteflies. Hand-pick hornworms, wash aphids off, and use fleece over young plants if flea beetles attack. Blight is the main disease risk in wet weather — remove affected leaves quickly and never compost diseased tops. Colorado potato beetle, where present, should be hand-picked with its egg clusters. The pests most often listed for red potatoes are aphids, hornworms, flea beetles, whiteflies. Inspect plants weekly, act early while numbers are small, and encourage natural predators such as ladybirds and hoverflies.
Harvest and storage
Start lifting new potatoes in May to June, once the plants flower — gently fork at the edge of a plant and take what you need, leaving the rest to grow on. For the main crop, wait until the tops have died back in June to July, then dig carefully with a fork. Let tubers dry on the surface briefly, never in strong sun, and cut away any green parts rather than eating them. Red potatoes have thin skins that bruise easily, so handle them gently, cure them in a cool, dark, airy place for a week or two, and store in the dark. They keep well, though not quite as long as russets.
Frequently asked questions
When should I plant red potatoes in Zone 8?
Plant seed potatoes in February to March, a few weeks before the average last frost of Mar 1–15, with a second planting in August for autumn. The soil should be workable and not waterlogged.
When can I harvest new potatoes?
Once the plants flower, usually May to June in Zone 8. Fork gently at the edge of a plant and lift a few tubers — the rest can keep growing for the main harvest.
Why do red potatoes get scab?
Scab is worse in alkaline soil and where fresh manure has been used. Keep soil pH on the acid side (5.0–6.0), avoid fresh manure, water in dry spells, and rotate the crop each year.
Do red potatoes store as well as russets?
Almost — they keep for months if cured and stored cool, dark and airy. Their thin skins bruise more easily, so handle them gently and use any damaged tubers first.
For the full year, browse the planting calendar hub. Compare with Red Potatoes in Zone 7, and see also Russet Potatoes in Zone 8.