Russet potatoes are the classic baking potato — long, brown-skinned, floury inside, the one that goes fluffy in the oven and makes proper mash. They are a natural fit for Zone 8, where the mild late winter lets you plant early and the long season gives the tubers time to bulk up. This guide covers when to plant russet potatoes in Zone 8, how to hill them, and how to harvest and store a crop that keeps.
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 russet 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 |
| Harvest | June to July for the spring crop; November for the autumn crop |
| Curing | 1 to 2 weeks in a cool, dark, airy place |
Russets are frost-tolerant rather than fully hardy, so they go in a few weeks before the average last frost of Mar 1–15 — the soil is workable and the tubers are safe underground, while any shoots that emerge get earthed up for protection. The Zone 8 February guide is the right window for the main crop, with a second August planting for autumn. Use the harvest date calculator to work out dates for your own garden.
How to start russet potatoes
Buy certified seed potatoes — never plant supermarket potatoes, which may carry disease. A few weeks before planting, lay the tubers in a tray in a cool, bright place to sprout (chit), with the end carrying most eyes facing up. Cut large tubers into pieces with at least two eyes each and let the cut faces dry for a day or two. Plant 4–6 inches deep in a trench, eyes up, spaced 12 inches apart.
Soil, spacing and sun
Russets want full sun and loose, fertile, well-drained soil — they bulk up best in soil they can push through, so fork the bed deeply and work in compost. They prefer a slightly acid soil pH of 5.0–6.0, and fresh manure should be avoided because it encourages scab. Space plants 12 inches apart in rows about 3 feet apart, and hill soil up around the stems as they grow so no tubers are exposed to light.
| 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 needs are moderate: keep the soil evenly moist, especially from flowering onwards, when the tubers are sizing up. Deep watering once or twice a week is better than a daily sprinkle. Let the soil dry a little as the tops die back before harvest. Mulch with straw to hold moisture and keep the soil cool in Zone 8's warm spring.
Companion planting
Marigolds, basil, onions and lettuce are good companions for potatoes, and marigolds in particular are valued in the potato bed. Do not plant potatoes beside tomatoes, peppers or eggplant — they share diseases — and keep them away from raspberries and pumpkins. Rotate potatoes to fresh ground each year and do not grow them where tomatoes grew last year. The companions listed for russet potatoes in standard references are marigolds, basil, onions, lettuce.
Pests and problems
Watch for aphids, hornworms, flea beetles and whiteflies. Hand-pick hornworms, wash aphids off with water, and cover young plants with fleece if flea beetles are bad. The serious threats are blight in wet summers and Colorado potato beetle — inspect leaves weekly, remove affected foliage promptly, and never compost diseased tops. The pests most often listed for russet 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
Harvest the spring crop in June to July, once the tops have yellowed and died back. For new potatoes, lift a few plants earlier once flowers appear. Dig carefully with a fork, starting from the edge of the row, and let tubers dry on the surface for a few hours — never leave them in the sun, or they turn green. Green parts contain solanine and should be cut away and not eaten. Cure in a cool, dark, airy place for a week or two, then store in the dark in sacks or boxes; russets store well for months.
Frequently asked questions
When should I plant russet potatoes in Zone 8?
Plant seed potatoes in February to March, a few weeks before the average last frost of Mar 1–15. You can plant a second crop in August for a November harvest. Soil should be workable, not cold and wet.
Do I need to chit russet potatoes?
Chitting is not essential in Zone 8's mild climate, but it gives an earlier, more even crop. Sprout tubers for 2 to 3 weeks in a cool, bright place before planting, with the eyes facing up.
Why are my potatoes green?
Tubers exposed to light turn green and produce solanine. Hill soil up around the stems as plants grow so no tubers see daylight, and store harvested potatoes in the dark. Cut away any green parts and do not eat them.
How long do russets store?
Cured and kept cool, dark and airy, russets keep for months — they are one of the best-storing potatoes. Check the store regularly and remove any soft or sprouting tubers promptly.
For the full year, browse the planting calendar hub. Compare with Russet Potatoes in Zone 7, and see also Red Potatoes in Zone 8.