Lawn & Garden • Iowa Planting Dates • Updated October 29, 2026

When to Plant Potatoes in Iowa: Dates by Region and How-To

Explore related guides: Last frost date in Iowa · When to start seeds in Iowa · When to plant tomatoes in Iowa · When to plant peppers in Iowa.

Potatoes are one of the first crops Iowa gardeners plant each spring. They are a cool-season crop, so unlike tomatoes they go in weeks before the last frost. This guide explains when to plant potatoes in Iowa by region, how to prepare seed potatoes, and how to plant, hill and harvest them, based on Iowa State University Extension and Outreach guidance.

When to plant potatoes in Iowa: the short answer

Iowa State University Extension recommends planting potatoes in early spring: late March or early April in southern Iowa, early to mid-April in central Iowa, and mid to late April in northern Iowa. Plant once the soil can be worked and is no longer soggy. Potatoes tolerate cool weather, so you do not need to wait for the last frost.

Potato planting dates by region

Not sure where your town falls? Check the freeze dates in our Iowa last frost date guide; counties with later last frosts usually belong in the later potato window.

Soil and weather: when the ground is ready

• Workable soil. Squeeze a handful: if it crumbles, it is ready. If it forms a sticky ball, wait a few dry days. Working wet soil damages its structure.
• Cool but not frozen. A common rule of thumb is soil of about 45°F at planting depth. Seed pieces in cold, wet soil sit idle and are more likely to rot.
• Full sun. ISU Extension says the site should get at least six hours of direct sun a day.
• Loose, slightly acid soil. Potatoes like loose, well-drained, fertile soil. Avoid adding lots of manure where potatoes will grow, since heavy organic matter can increase potato scab.
• Late frost after sprouting? If shoots are up and a hard frost is forecast, pull a little soil over them or cover the row. Potatoes usually regrow from below ground.

Choosing and preparing seed potatoes

• Buy certified, disease-free seed potatoes from a garden center or mail-order nursery. Potatoes saved from last year may carry undetectable diseases, and supermarket potatoes may have been treated to prevent sprouting.
• Plant small tubers whole. Cut large ones into pieces of about 1.5 to 2 ounces, each with 1 or 2 eyes (buds).
• Let cut pieces heal. Keep freshly cut seed pieces in a humid spot at 60 to 70°F for 1 or 2 days. The cut surfaces callus over, which helps prevent rot in cool, wet spring soil.

How to plant potatoes in Iowa

1. Fertilize. Without a soil test, ISU Extension suggests 1 to 2 pounds of an all-purpose fertilizer such as 10-10-10 per 100 square feet, worked in shortly before planting.
2. Open a furrow about 4 inches deep.
3. Set seed pieces cut side down, 3 to 4 inches deep and about 1 foot apart.
4. Space rows 2½ to 3 feet apart so there is room to hill soil later.
5. Cover and firm the soil, then water if the ground is dry.
6. Short on space? Plant 3 or 4 seed pieces in a 10-gallon grow bag and add soil as the plants grow.

Hilling and harvest

As plants grow, hill soil around the base of the stems so the developing tubers stay covered. Tubers exposed to light turn green, and largely green potatoes should be thrown away. Many gardeners start hilling when plants are 6 to 8 inches tall and repeat once or twice more.

For new potatoes, dig while plants are still green and the tubers are over 1 inch across, and eat them soon because they do not store well. For storage potatoes, wait until the vines have died. Dig one or two hills to check: if the skins are thin and rub off easily, give the crop more time. Store harvested potatoes in a dark place.

Tools for planting potatoes

All four were listed as sold by Amazon.com when checked on October 29, 2026. Check the current listing before you buy.

For small spaces: iPower Potato Grow Bags

A good fit for patios and small yards. The side flap lets you check for and pick new potatoes without dumping the whole bag. Fabric bags dry out faster than garden soil, so check moisture often in summer.

To check soil temperature: Taylor Soil Thermometer

Takes the guesswork out of early-spring planting. Push the probe in 4 inches in the morning to see whether your soil has warmed enough for seed pieces.

For furrows and hilling: Kings County Tools Hoe

Useful for opening furrows at planting time and for pulling soil up around the stems when you hill. The pointed leaf-shaped blade also works well for weeding between rows.

For harvest: Spear & Jackson Border Fork

A fork is gentler than a spade at harvest, because it lifts tubers instead of slicing through them. Start digging well to the side of the plant to avoid spearing potatoes.

FAQs

When should I plant potatoes in central Iowa?
Early to mid-April, according to Iowa State University Extension, once the soil can be worked and is not waterlogged.

When should I plant potatoes in northern Iowa?
Mid to late April. Northern Iowa warms later, so ISU Extension places the window about a week or two after central Iowa.

Can I plant potatoes in March in Iowa?
In southern Iowa, yes: ISU Extension lists late March or early April as the planting window there. Farther north, wait until April.

How deep should I plant seed potatoes?
Plant seed pieces cut side down, 3 to 4 inches deep and about 1 foot apart, in rows 2½ to 3 feet apart.

Should I cut seed potatoes before planting?
Small tubers can go in whole. Cut large ones into 1.5 to 2 ounce pieces with 1 or 2 eyes each, then let them heal for 1 or 2 days at 60 to 70°F so they callus and resist rot.

Can I plant potatoes from the grocery store?
ISU Extension recommends certified disease-free seed potatoes. Supermarket potatoes may have been treated to prevent sprouting, and saved potatoes can carry disease.

When do I harvest potatoes in Iowa?
Dig new potatoes while plants are still green and tubers are over 1 inch across. For storage potatoes, wait until the vines have died and the skins no longer rub off easily.

Sources and review scope

This guide was prepared on October 29, 2026 from the following sources and from the product listings on Amazon.com. Homingwell did not perform hands-on testing.

• Iowa State University Extension and Outreach – When should I plant potatoes in the garden?
• Iowa State University Extension and Outreach – Growing Potatoes in the Home Garden
• Aaron J. Steil, ISU Extension and Outreach – Growing and harvesting potatoes
• ISU Extension Yard and Garden – Growing potatoes

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