When to Plant Potatoes

Written & researched by Elena Marsh Gardening & Landscaping Editor

Updated February 2026

Plant potatoes 2 to 4 weeks before your average last spring frost, once the soil temperature at 4 inches deep has reached 45 to 50°F. For most of the US that falls between March and May; warm southern zones (8 to 10) plant as early as January to March, while cold northern zones (3 to 4) usually wait until late April or May. Soil temperature matters more than the calendar date — seed potatoes rot in cold, wet ground below 45°F and gain nothing from going in early.

Potatoes are a cool-season crop that tuberizes best when soil temperatures sit between 60 and 70°F, so the goal is to plant early enough that the bulk of tuber growth happens before summer heat, but late enough that the seed pieces are not sitting in frigid mud. Getting that window right is the whole game.

The soil-temperature rule that beats any calendar

Air temperature swings day to day, but soil temperature is what the seed potato actually responds to, and it lags well behind the air in spring. A $10 soil thermometer pushed 4 inches into the bed removes all the guesswork.

Raised beds and containers warm one to two weeks ahead of open ground, which is one reason bag and tote growing has become popular in short-season regions — see how to grow potatoes in pots.

Timing around your last frost date

The standard advice is to plant 2 to 4 weeks before your last expected frost. Because potatoes take about two to three weeks to emerge, shoots typically break the surface right around the frost date. That is fine: the tubers underground are safe, and if emerged foliage gets nipped by a late frost, the plant almost always regrows from the tuber. If a hard frost is forecast after shoots appear, mound soil or straw over them for the night.

Look up your local average last-frost date rather than relying on a fixed month — it varies by hundreds of miles and by elevation. Then count back 2 to 4 weeks, and confirm the soil has hit 45°F before you commit the seed potatoes.

Potato Planting Windows by USDA Zone

These windows assume a spring maincrop. Use them as a starting point and adjust to your own last-frost date and soil temperature.

Match the variety to your season length

Potatoes are grouped by how long they take from planting to harvest, and matching that to your window prevents a crop that never sizes up before heat or frost.

• Early (first earlies), 70 to 90 days: 'Yukon Gold', 'Red Norland', 'Caribe'. Best for short seasons and new potatoes.
• Midseason, 90 to 110 days: 'Kennebec', 'Purple Majesty', 'Gold Rush'. A good all-round choice.
• Late (maincrop), 110 to 135 days: 'Russet Burbank', 'German Butterball'. Best storage potatoes; need a long, cool season.

In hot southern zones, lean on early and midseason types so the crop finishes before summer shuts tuber formation down.

Chitting: pre-sprouting for an earlier crop

Chitting gives seed potatoes a head start and can pull a northern harvest forward by up to two weeks.

1. Start 2 to 4 weeks before planting. Set seed potatoes eyes-up in an egg carton or shallow tray.
2. Keep them cool and bright. 50 to 60°F with indirect light. Warmth plus darkness gives long, weak white sprouts you do not want; cool light gives short, sturdy green ones.
3. Plant when sprouts are about 1/2 inch long, stubby and green. Cut large tubers into pieces with at least two eyes each, and let the cut faces dry (cure) for a day or two before planting to reduce rot.

How to Plant Potatoes Once the Timing Is Right

Timing done, the planting itself is simple. Plant seed pieces 3 to 4 inches deep and 10 to 12 inches apart, in rows 2 to 3 feet apart, cut side down and eyes up. As plants grow, hill loose soil or straw up around the stems every couple of weeks to keep developing tubers covered — exposed tubers turn green and produce solanine, which is mildly toxic and bitter.

Potatoes are heavy feeders. Work compost and a balanced or slightly higher-potassium fertilizer into the bed at planting; owners consistently favor formulations aimed at tuber and root crops, and the ranked field is in best fertilizer for potatoes, using the method in how we rank. Keep watering steady once tubers begin forming — details in how often to water potatoes.

A second (fall) crop in warm zones

In zones 7 and warmer, you can plant a second potato crop in mid to late summer for a fall harvest, timed so tubers bulk up in the cooling weather of early autumn and are lifted before the first frost. Use early varieties and pre-sprout them, because midsummer soil can be hot enough to delay emergence. This is a reliable way to get two crops a year where winters are mild.

When weather forces you to adjust the window

Averages are a starting point, but any given spring can run early or late, and the seed potato responds to the actual conditions, not the calendar. A cold, wet spring keeps soil below 45°F long after the "normal" planting date, and forcing seed pieces into that saturated ground is the surest way to lose them to rot — wait, or plant into a raised bed or container that warms and drains faster. An unusually warm, dry spring lets you plant a week or two early, provided the soil has genuinely reached 45 to 50°F.

The reliable habit is to watch three signals together: your average last-frost date for the rough window, a soil thermometer for the go/no-go call, and the short-term forecast so you are not planting right before a hard freeze or a week of cold rain. When the signals conflict, let the soil temperature and drainage decide — potatoes lose nothing by going in a little late into warm soil, but they can lose everything going in early into cold mud.

Potato Timing Mistakes That Cost You a Crop

For the full growing cycle from planting through harvest and curing, see how to grow potatoes, and browse everything from soil prep to succession planting at the seeds and vegetable growing hub.