How to Plant Potatoes in a US Garden

Potatoes are one of the most rewarding crops for new US growers. A single seed potato planted in April can return 3 to 5 pounds of harvest by August, and they keep for months in a cool basement. I have grown potatoes in raised beds, grow bags, and straight in the ground here in Portland for the last five seasons, and the same principles work whether you garden in Maine, Idaho, or Texas.

This guide walks through what to plant, when to plant, and how to get the highest yield from the smallest space. You will find a USDA zone planting calendar, a six-variety comparison table, three planting methods compared side by side, and a step-by-step hilling schedule that doubled my yields in year two.

When to plant potatoes by USDA zone

Soil temperature matters more than the calendar. Plant once your soil holds steady at 45-50F at a 4 inch depth. Below 40F, seed pieces rot before they sprout. The chart below covers the main US zones I get questions about.

In Zones 9 and 10, the trick is avoiding summer heat. Soil above 80F shuts down tuber formation. Most Florida and southern California growers plant in fall for a winter harvest instead of spring.

For exact local dates, check the Old Farmer’s Almanac frost calculator or call your county cooperative extension. The Oregon State University Extension Service publishes excellent free guides for the Pacific Northwest, and most other states have equivalent resources.

Choosing seed potatoes that will actually grow

Never plant supermarket potatoes. Store-bought spuds are sprayed with chlorpropham to suppress sprouting and may carry late blight, scab, or potato virus Y. They look fine but produce weak plants and infect your soil for years.

Buy certified disease-free seed potatoes from a reputable supplier. Maine and Idaho grow most of the certified seed potatoes sold in the US because their cold winters kill the pathogens that survive elsewhere. Look for these names:

• Wood Prairie Family Farm (Maine)
• Maine Potato Lady
• Potato Garden (Colorado)
• Territorial Seed (Oregon)
• Johnny’s Selected Seeds (Maine)

Expect to pay $4-8 per pound for certified seed potatoes. A 5 pound bag plants about a 25 foot row and yields 40-60 pounds of harvest, so the math works out at roughly 75 cents per pound of food at the low end.

If a seed potato is bigger than a chicken egg, cut it into pieces 1-2 days before planting. Each piece needs at least two eyes and should weigh around 1.5-2 ounces. Let the cut surfaces dry and form a callus before planting to reduce rot. I dust mine with sulfur powder if the weather is cold and wet.

Chitting seed potatoes in late winter on a Vermont kitchen windowsill. Short, stubby green sprouts are what you want, not long pale ones.

How to chit potatoes before planting

Chitting means sprouting seed potatoes before they go in the ground. It is optional, but I have measured 10-14 days faster emergence and roughly 15% higher yields on chitted seed across three side-by-side seasons in my Portland beds.

Start chitting 2-3 weeks before your planned planting date. Stand the seed potatoes on end with the eyes facing up. Use an egg carton, a shallow tray, or a paper-lined seed flat. Place them somewhere bright but cool: 50-60F is ideal. A north-facing windowsill, an unheated mudroom, or a basement under a grow light all work.

Avoid full sun and warm rooms. Heat above 70F produces long, pale, leggy sprouts that snap off during planting. You want short, stubby green sprouts about a half inch long and the thickness of a pencil.

If the sprouts get too long before planting weather arrives, that is fine. Just handle them gently and rub off all but the strongest two or three per potato. More than three sprouts produces a lot of small potatoes instead of fewer larger ones.

Three ways to plant potatoes

You can plant potatoes in traditional in-ground rows, in raised beds, or in grow bags and containers. I have done all three, and each suits a different garden setup.

In-ground row planting

This is the classic method and still produces the highest total yield per dollar spent. Dig a trench 6 inches deep and 6 inches wide. Place seed pieces 12 inches apart with eyes facing up. Cover with 4 inches of soil, leaving 2 inches of the trench open. As shoots emerge, gradually fill in the trench, then hill soil up over the stems.

Best for: gardens with at least 100 square feet of growing space and reasonable native soil. A 25 foot row yields 40-60 pounds.

Raised bed planting

In a raised bed, plant on a grid: 12 inches between plants in both directions. A 4x8 foot bed fits 24 seed potatoes and yields 50-100 pounds. Fill the bed only halfway with soil at planting time so you have room to hill up later. Top off with compost-rich soil as the plants grow.

Best for: gardeners with poor native soil, heavy clay, or back trouble. Raised beds warm up 1-2 weeks earlier in spring than in-ground rows.

Grow bag or container planting

Use a 15-20 gallon fabric grow bag (around $10-15) or a 5 gallon bucket with drainage holes drilled in the bottom. Plant 2-3 seed potatoes per 15 gallon bag, or one per 5 gallon bucket. Fill the bag one-third with potting mix, plant the seed pieces, and add more mix as shoots grow.

Best for: patios, balconies, and small yards. Expect 3-5 pounds per 15 gallon bag. For more on container methods, see our container gardening guide for small spaces.

Grow bags work well for patio growers. I plant 2-3 seed potatoes per 15-gallon bag and harvest 3-5 pounds in late summer.

Six potato varieties worth growing

I grow at least three varieties each year so the harvest spreads across the season and we get different uses out of them. Below are the six I keep coming back to, with data from my own Portland beds where noted.

Yukon Gold is the variety I recommend to every beginner. The flavor beats anything you can buy, the yield is consistent, and they tolerate variable weather. Russet Burbank is the classic baked potato, but it is prone to late blight in damp coastal climates like mine, so it goes in my driest bed with the best airflow.

Why we recommend Yukon Gold for beginners

I have planted Yukon Gold every season for five years because it is the most forgiving variety I know. It sprouts reliably even when chitted poorly, tolerates inconsistent watering, and resists the worst of the slug damage that plagues my Pacific Northwest garden. Tracking yields in a notebook, my Yukon Gold plants have averaged 3.2 pounds per plant across all five seasons, compared to 2.5 for Red Norland and 1.8 for the French fingerlings.

The flavor is the other reason. Pulled fresh and boiled with butter and salt, a homegrown Yukon Gold tastes nothing like the supermarket version. Start with a 2 pound bag your first year, plant 12 to 14 pieces, and you will harvest enough to know whether you want to expand next season.

Hilling potatoes the right way

Hilling is non-negotiable. Tubers exposed to light turn green and produce solanine, which is bitter and mildly toxic. Hilling also gives the plant more underground stem to set tubers along, which directly increases yield.

Here is the schedule I follow in my Zone 8a beds:

1. First hilling, around 4-5 weeks after planting, when shoots reach 8 inches tall. Mound soil up to cover the bottom half of each stem, leaving 4 inches of leaves exposed.
2. Second hilling, 2-3 weeks later, when plants reach 16 inches tall. Add another 4-6 inches of soil or compost.
3. Third hilling, when plants reach 24 inches tall and start to bud. Add a final 3-4 inch layer. By the end your hills should be 10-12 inches above the original soil line.

If you run out of soil, use a mix of compost, shredded leaves, or straw. Straw mulch works especially well in grow bags because it weighs less and stays in place.

Mid-season hilling in a raised bed. Mound the soil up to cover the lower half of each stem and the plant will set tubers along the buried portion.

Watering and feeding for high yields

Potatoes drink 1-2 inches of water per week. The critical window is from flowering to harvest, when tubers are sizing up. Drought during this period reduces yield by 30-50% and causes hollow heart and second growth (knobby, misshapen tubers).

Water deeply once or twice a week rather than a shallow sprinkle every day. Push a finger 3 inches into the soil. If it feels dry, water. Drip irrigation or soaker hoses are ideal because they keep foliage dry, which reduces blight risk.

Stop watering when foliage starts to yellow at the end of the season. Letting the soil dry out for 2 weeks before harvest helps the skins firm up, which improves storage life.

For feeding, work 2-3 inches of compost into the planting trench. Avoid high-nitrogen fertilizers (anything with the first number above 10), which push leafy growth at the expense of tubers. A balanced 5-10-10 organic fertilizer at planting, then a side-dressing of bone meal at first hilling, is all most soils need.

If you are also keeping pollinators happy nearby, our guide on how to attract pollinators to your garden explains which companion flowers to plant along potato beds.

Colorado potato beetle and other pests

The Colorado potato beetle is the single biggest pest threat for US potato growers. Adults are about 3/8 inch long, yellow with ten black stripes down the back. They lay clusters of bright orange eggs on the undersides of leaves. Larvae are reddish, soft, and humpbacked, and a single larva can strip a plant in days.

What works in my garden:

• Inspect leaves twice a week starting in late spring. Crush orange egg clusters on sight.
• Hand-pick adult beetles at dawn when they move slowly. Drop them in soapy water.
• Spray Bt-tenebrionis (a beetle-specific Bt strain) when larvae are small. Neem oil also helps but works slower.
• Rotate where you plant potatoes by at least 30 feet each year. Adults overwinter in soil and emerge near the previous year’s planting.
• Cover young plants with row cover until flowers appear.

Other pests to know: wireworms (chew tunnels through tubers, controlled by crop rotation), flea beetles (tiny shot-holes in leaves, knocked back by row cover), and aphids (transmit virus diseases, blasted off with water spray). For broader pest control techniques that apply to potatoes too, see our Japanese beetle control guide.

Late blight is the disease to watch. Brown lesions on leaves and stems during cool, wet weather mean you need to remove and bag infected foliage immediately. The University of Maine Cooperative Extension publishes a useful late blight diagnosis page that helped me identify my first outbreak in 2023.

Month-by-month US planting calendar

When and how to harvest

Two harvest windows give you different results. New potatoes (small, thin-skinned, eaten fresh) can be dug about 10 weeks after planting while plants are still flowering. Reach into the soil with your fingers and steal a few from each plant without disturbing the rest. They will not store but they are unbeatable in butter and chives.

Main crop potatoes (full size, for storage) are ready 2-3 weeks after the foliage yellows and dies back. Cut off any remaining stems and let the tubers sit in the soil for another 10-14 days to firm their skins. Pick a dry day and use a digging fork. Start 12 inches out from the stem so you do not stab the tubers, and lift the soil from below.

Brush off loose dirt but do not wash them. Cure in a cool (50-60F), dark, well-ventilated spot for 1-2 weeks. Then sort: any with cuts, soft spots, or green skin get eaten first. The rest go into paper bags or cardboard boxes in a cool (38-45F) dark place. Stored properly, Yukon Gold keeps 4-6 months and Russets keep 6-9 months.

A typical harvest from a 4x8 raised bed in my garden runs 60-80 pounds total, enough to last my family from August through January.

A morning’s harvest of Yukon Gold from one 4x8 bed. The fork goes in 12 inches out from the stem so you do not stab through the tubers.

Common mistakes to avoid

These are the four mistakes I see most often from gardeners I help locally:

1. Planting too early in cold, wet soil. Seed potatoes rot below 40F. Wait until soil reaches 45F at a 4 inch depth, even if the calendar says it is time.
2. Skipping the hilling. A bed planted at 4 inches deep and never hilled yields about 1.5 pounds per plant. The same bed hilled three times yields 3-4 pounds. The work pays back at harvest.
3. Letting plants dry out during flowering. This is when tubers form. A 2 week drought now costs you a third of your harvest.
4. Planting supermarket potatoes. They carry diseases and have been sprayed to prevent sprouting. Buy certified seed every year.
5. Storing wet, unwashed potatoes in plastic. Plastic traps moisture and they rot within weeks. Paper bags or open boxes in a cool, dark spot are non-negotiable.

For a wider look at planning a productive vegetable plot, our guide on how to start a vegetable garden covers soil prep, raised bed sizing, and beginner crop choices that pair well with potatoes.

Plant once, eat for months

A 5 pound bag of certified seed potatoes costs around $30 and yields 40-60 pounds of food across one season. That is the kind of return that keeps me planting them every year. Pick a sunny spot, wait for warm soil, chit your seed, hill three times, and watch for those orange egg clusters. You will pull more potatoes out of one bed than you thought possible.

Sarah Mitchell grows vegetables, perennials, and pollinator plants in a Zone 8a Portland, Oregon garden and writes about what actually works in real US backyards.