This guide answers when to plant red potatoes zone 7 with timing worked out from USDA Zone 7 frost-date averages, not guesswork. Red potatoes are the thin-skinned, waxy potato for salads, roasting and boiling — they hold their shape when cooked, which makes them the potato to choose when you want slices and cubes rather than mash. In Zone 7 they grow like any potato, planted in mid-March and harvested in early summer, and their red skins make them easy to spot at harvest time, which is half the fun of digging them.
Zone 7 at a glance
Zone 7 covers areas where average annual minimum temperatures run 0 to 10°F. The average last spring frost falls in the Mar 15–Apr 1 range and the average first autumn frost in the Nov 1–15 range — these are USDA zone averages from USDA and NOAA frost records, not exact dates for any one garden, so check your local extension service before planting tender crops outside. Use the frost date calculator to work out dates for your own garden, and browse the planting calendar hub for the full Zone 7 year.
When to plant red potatoes in Zone 7
| Step | Timing in Zone 7 |
|---|---|
| Start indoors | Not started indoors — plant seed potatoes directly |
| Direct sow outdoors | Mid-March, about 2 to 4 weeks before the last frost, once soil is workable |
| Transplant outdoors | Not transplanted — planted in place |
| Autumn / second sowing | Not suitable — one spring crop |
| Harvest | June to July, about 90 to 120 days after planting |
The table above is the short answer. The detail matters because red potatoes is frost-tolerant — a hardy crop that tolerates light frost, so it can go out weeks before the last frost. Start indoors when the table says so, using the seed-starting calculator to count back from your last frost, and harden seedlings off for a week before they go outside. The Zone 7 March guide shows what else is happening in the garden in that month.
How to plant red potatoes
Plant certified seed potatoes in mid-March, about 2 to 4 weeks before the last frost, once soil is workable. Cut larger tubers into pieces with two or more eyes, let cuts dry for a day, and plant 4 inches deep and 12 inches apart in loose soil with a pH of 5.0 to 6.0. Earth up soil around the stems as they grow so developing tubers stay in darkness — light turns them green. Rotate potatoes and do not plant where tomatoes or peppers grew last year.
Give red potatoes full sun — at least six hours of direct sun a day for full-sun crops, or morning sun with afternoon shade where part shade is listed. Prepare the bed by forking in compost and removing stones and weeds, and check the soil pH: red potatoes prefers 5.0–6.0. Space plants 12 inches apart — the spacing in the table below — and sow seed at the depth on the packet, keeping the seedbed moist until germination, which takes 14–28 days.
| Fact | Range |
|---|---|
| Sun | full sun |
| Days to germination | 14–28 |
| Days to maturity | 90–120 |
| Spacing | 12 inches |
| Soil pH | 5.0–6.0 |
| Sowing method | direct sow |
| Cold tolerance | frost-tolerant |
| Water needs | moderate |
Watering and feeding
Red potatoes have moderate water needs, with steady moisture especially important while tubers are forming. Water about an inch a week in dry weather and mulch to keep soil cool and moist. Feed with compost worked in before planting. Once the tops yellow and die back, stop watering and leave tubers in the ground for a week or so to let skins set before digging.
A layer of mulch — straw, shredded leaves or compost — helps on both fronts: it holds moisture in the soil, keeps roots cool, and stops soil splashing onto leaves and fruit. Keep mulch a few inches away from stems so it does not trap damp against them.
Companion plants and rotation
Good companions for red potatoes include marigolds, basil, onions, lettuce. Use the companion planting finder to plan combinations for your whole bed. Rotate crops each year: do not plant red potatoes where the same family grew last year, and keep a simple note of what grew where so you can rotate properly next season. Also see our guide to when to plant russet potatoes in Zone 7, which pairs well with red potatoes in a Zone 7 bed.
Pests and problems
The common pests for red potatoes are aphids, hornworms, flea beetles, whiteflies. Colorado potato beetle is the main pest: hand-pick beetles and larvae, and check leaf undersides regularly. Check plants weekly, looking under leaves as well as on top — most problems are easy to deal with if caught early. Good air flow helps: do not crowd plants, water at the base rather than over the leaves, and clear away dead leaves and debris where pests hide.
Harvesting and storing
Harvest about 90 to 120 days after planting, after the tops have died back. Dig gently with a fork on a dry day, let tubers dry briefly on the surface, then store in a cool, dark, airy place. Red potatoes have thinner skins than russets, so handle them gently — bruised tubers rot first. They keep for several weeks to a few months in good storage; check them often and use any damaged ones first.
For the best flavour, harvest in the morning, when plants are cool and their moisture and oils are at their best, and use a sharp knife or scissors for a clean cut that heals quickly.
Frequently asked questions
When should I plant red potatoes in Zone 7?
Mid-March, about 2 to 4 weeks before the last frost, once soil is workable. As a rule, work back from the average last frost range of Mar 15–Apr 1 for spring planting, and back from the average first frost range of Nov 1–15 for autumn planting. These are zone averages, so check your local extension service for your area.
Can I grow red potatoes in containers?
Yes, in most cases — choose a pot at least 12 inches deep with drainage holes, fill it with good potting mix, and water more often than beds, since pots dry out faster. Container growing suits red potatoes well, especially where garden soil is heavy or space is limited.
How long does red potatoes take to grow?
About 90–120 days to maturity from sowing or transplanting, depending on variety and weather. Germination takes 14–28 days. Warm, sunny weather speeds growth; cold or cloudy weather slows it, so treat these as ranges, not exact dates.
What soil pH does red potatoes need?
A pH of 5.0–6.0 is ideal. Test your soil before planting and amend it if needed — your local extension service can test a sample and advise on what to add.
What grows well with red potatoes?
Good companions include marigolds, basil, onions, lettuce. Avoid planting it where the same family grew last year, and give it the spacing and sun listed in the table above so companions do not crowd it out.