When To Plant Potatoes In Arkansas

Arkansas gardeners should plant potatoes in early spring, around mid-March, when the soil has warmed slightly. Knowing exactly when to plant potatoes in Arkansas can mean the difference between a bumper crop and a disappointing harvest. The state’s varied climate, from the Ozarks to the Delta, means timing shifts a bit depending on your specific location.

Potatoes are a cool-season crop. They need soil temperatures between 45°F and 50°F to start growing well. If you plant too early, the seed pieces may rot in cold, wet ground. Plant too late, and the heat of an Arkansas summer will stop tuber formation.

This guide covers everything you need. We will look at soil temps, frost dates, variety selection, and step-by-step planting instructions. Let’s get your potato patch off to a strong start.

The best time to plant potatoes in Arkansas is from mid-March to early April. This window works for most of the state. Gardeners in southern Arkansas can plant a bit earlier, around the first week of March. Those in the northern parts, like Fayetteville or Mountain Home, should wait until late March or early April.

Soil temperature is your best guide. Use a soil thermometer. Insert it four inches deep in your garden bed. You want a consistent reading of at least 45°F. If the soil feels cold and clumpy, wait another week.

Another reliable sign is when dandelions start blooming and forsythia bushes show yellow flowers. Nature’s calendar is often more accurate than a date on the wall.

Understanding Arkansas’s Growing Zones

Arkansas spans USDA hardiness zones 6a in the north to 8a in the south. This difference affects planting dates by about two to three weeks.

Zone 6a (northern Arkansas): Plant late March to early April. Last frost is usually around April 10-20.
Zone 7a/7b (central Arkansas): Plant mid-March to early April. Last frost is around March 30-April 10.
Zone 8a (southern Arkansas): Plant early to mid-March. Last frost is around March 15-25.

Check your specific zone online if you are unsure. Local county extension offices are also great resources for precise frost dates.

Why Timing Matters So Much

Potatoes are sensitive to day length and temperature. They form tubers when days are long and temperatures are moderate, between 60°F and 70°F. If you plant too late, the heat arrives before tubers develop fully. The plants may flower but produce only small, marble-sized potatoes.

Planting too early risks frost damage to emerging shoots. A light frost can kill the tops, but the underground seed piece often survives and sends up new shoots. This delays harvest by a couple of weeks.

The goal is to have your potatoes mature before the heat of late June and July. Most varieties need 70 to 100 days from planting to harvest. Count backward from your typical summer heat onset to find your ideal planting window.

Choosing The Right Potato Varieties For Arkansas

Not all potatoes grow equally well in Arkansas’s climate. You want varieties that mature relatively quickly and resist common diseases like scab and blight.

Here are top choices for Arkansas gardens:

Yukon Gold: An early-maturing yellow potato. Ready in about 70-80 days. Great for boiling and mashing.
Red Pontiac: A classic red potato. Matures in 90-100 days. Stores well and produces heavy yields.
Kennebec: A white potato excellent for baking and frying. Matures in 80-90 days. Disease resistant.
Irish Cobbler: An early heirloom variety. Ready in 70-80 days. Irregular shape but fantastic flavor.
Purple Majesty: A fun, colorful option. Matures in 90 days. High in antioxidants.

Avoid long-season varieties like Russet Burbank unless you have a very early spring. They need 120+ days and often struggle with Arkansas summer heat.

Seed Potatoes Vs. Grocery Store Potatoes

Always buy certified seed potatoes from a garden center or online supplier. Seed potatoes are grown specifically to be disease-free. Grocery store potatoes are often treated with sprout inhibitors and may carry diseases like blight.

You can use organic grocery potatoes if they have started sprouting. But the risk of poor yields is higher. Spend the few extra dollars on certified seed for reliable results.

Preparing Your Soil For Potatoes

Potatoes grow best in loose, well-drained soil with a pH between 5.0 and 6.0. Slightly acidic soil helps prevent scab disease. Test your soil pH a few weeks before planting.

If your soil is heavy clay, consider growing potatoes in raised beds or large containers. The loose soil allows tubers to expand without resistance.

Follow these steps to prepare your garden bed:

Clear all weeds and debris from the area.
Loosen the soil to a depth of 10-12 inches using a garden fork or tiller.
Mix in 2-3 inches of well-rotted compost or aged manure.
Add a balanced fertilizer like 10-10-10 at a rate of 1 pound per 100 square feet.
Rake the bed smooth and remove any large rocks or clods.

Do not add fresh manure or high-nitrogen fertilizer. Too much nitrogen produces lush foliage but few tubers.

Cutting And Curing Seed Potatoes

About a week before planting, prepare your seed potatoes. If they are large, cut them into pieces about the size of a chicken egg. Each piece must have at least one “eye” (a small dimple where sprouts emerge).

Small seed potatoes can be planted whole. Cutting them increases the number of plants you get from each pound of seed.

After cutting, let the pieces cure for 2-3 days in a cool, dry place. This allows the cut surfaces to callus over. Callusing prevents rot when the pieces go into the ground.

Some gardeners dust the cut pieces with sulfur powder to further prevent fungal issues. This is optional but helpful in wet springs.

Step-By-Step Planting Guide

Once your soil is ready and your seed pieces are cured, it is time to plant. Follow these steps for best results:

Dig trenches 4-6 inches deep. Space trenches 2-3 feet apart.
Place seed pieces in the trench, cut side down, with eyes facing up.
Space pieces 10-12 inches apart within the trench.
Cover the pieces with 3-4 inches of soil. Do not fill the trench completely yet.
Water the trench lightly after planting if the soil is dry.

As the potato plants grow, you will gradually fill in the trench. This process is called “hilling.” It encourages more tubers to form along the buried stem.

Hilling And Mulching

When the plants are about 6-8 inches tall, pull soil up around the stems. Leave only the top 2-3 inches of leaves exposed. Repeat this process every 2-3 weeks until the trench is filled and a small mound forms.

Hilling serves several purposes:

Prevents sunlight from reaching developing tubers (sunlight turns them green and toxic).
Keeps soil cool and moist.
Supports the plants and prevents them from falling over.
Encourages more tuber production along the buried stem.

After the final hilling, apply a 3-4 inch layer of straw or shredded leaves as mulch. Mulch conserves moisture and suppresses weeds. It also keeps soil temperatures more stable during hot spells.

Watering And Fertilizing Potatoes

Potatoes need consistent moisture, especially from flowering onward. Uneven watering causes knobby or cracked tubers. Aim for about 1-2 inches of water per week from rain or irrigation.

Water deeply and infrequently rather than shallowly every day. Deep watering encourages roots to grow downward. Shallow watering leads to shallow roots that dry out quickly.

Stop watering about two weeks before harvest. This allows the skins to toughen up for storage. Wet soil at harvest time can lead to rot in storage.

Fertilize lightly when the plants are about 6 inches tall. Side-dress with a low-nitrogen fertilizer like 5-10-10. Apply about 1/2 cup per 10 feet of row, then water it in.

Avoid fertilizing after the plants flower. Extra nitrogen at this stage promotes leafy growth at the expense of tuber development.

Common Pests And Diseases In Arkansas

Arkansas potato growers face a few common problems. Here is what to watch for:

Colorado potato beetle: Yellow-and-black striped beetles that eat leaves. Hand-pick them or use neem oil.
Aphids: Small green or black insects on new growth. Blast them off with a hose or use insecticidal soap.
Flea beetles: Tiny jumping beetles that create small holes in leaves. Row covers help prevent them.
Early blight: Brown spots with concentric rings on lower leaves. Avoid overhead watering and remove affected leaves.
Scab: Rough, corky patches on tuber skins. Maintain soil pH below 6.0 and use resistant varieties.

Rotate your potato planting location each year. Do not plant potatoes where tomatoes, peppers, or eggplants grew the previous season. These crops share similar diseases.

When To Harvest Potatoes In Arkansas

You can harvest potatoes at two stages: “new” potatoes or mature storage potatoes.

New potatoes are harvested about 2-3 weeks after the plants finish flowering. The skins are thin and delicate. These potatoes are perfect for boiling and eating fresh. They do not store well.

For mature storage potatoes, wait until the plants’ tops turn yellow and begin to die back. This usually happens in late June or early July for spring-planted potatoes. Cut the tops off and leave the tubers in the ground for another 10-14 days. This allows the skins to set.

Harvest on a dry day. Use a garden fork to gently lift the tubers from the soil. Be careful not to spear or bruise them. Brush off excess soil, but do not wash them until you are ready to use them.

Curing And Storing Potatoes

After harvest, cure potatoes for 1-2 weeks before long-term storage. Curing heals minor cuts and thickens the skins.

Place potatoes in a single layer in a dark, well-ventilated area with temperatures around 50-60°F and high humidity. A garage or basement works well. Do not cure in direct sunlight.

After curing, store potatoes in a cool (40-50°F), dark, humid location. A root cellar is ideal. A basement or cool closet also works. Do not store potatoes near apples or onions, as they release gases that cause sprouting.

Properly stored potatoes can last 3-6 months. Check them regularly and remove any that show signs of rot.

Growing Potatoes In Containers

If you have limited space or poor soil, grow potatoes in containers. This method works well on patios or balconies.

Use a container at least 10-15 gallons in size. Drill drainage holes in the bottom. Fill the bottom with 4-6 inches of potting mix. Place 3-4 seed pieces on the soil, then cover with 3 inches of mix.

As the plants grow, add more potting mix until the container is full. Keep the soil consistently moist. Harvest by dumping out the entire container when the plants die back.

Container-grown potatoes are less prone to soil-borne diseases. They also warm up faster in spring, allowing earlier planting in cooler areas.

Fall Potato Planting In Arkansas

Some Arkansas gardeners plant a second crop of potatoes in late summer for a fall harvest. This works best in southern and central parts of the state.

Plant fall potatoes about 100 days before the first expected frost. For most of Arkansas, this means planting in late July to mid-August. Use early-maturing varieties like Yukon Gold or Red Norland.

Fall planting can be tricky due to heat and drought. Keep the soil consistently moist. Mulch heavily to keep soil temperatures down. Harvest after the first frost kills the tops, or earlier if the plants die back naturally.

Fall potatoes often store better than spring potatoes because they mature in cooler weather.

Frequently Asked Questions

Can I plant potatoes in Arkansas in February?

Only in very southern Arkansas and only if the soil is workable and temperatures are mild. Most years, February is too cold and wet. Wait until mid-March for best results.

What happens if I plant potatoes too late in Arkansas?

Late planting exposes potatoes to summer heat during tuber formation. Yields drop significantly, and tubers may be small or misshapen. The plants may also suffer from pest pressure.

Should I water potatoes after planting in Arkansas?

Only if the soil is dry. Overwatering cold spring soil can cause seed pieces to rot. Water lightly after planting, then wait for rain or dry conditions before watering again.

How deep should I plant potatoes in Arkansas clay soil?

Plant only 3-4 inches deep in heavy clay. Deeper planting can lead to poor drainage and rot. Use raised beds or add organic matter to improve soil structure.

Can I grow potatoes year-round in Arkansas?

No, potatoes need a cool period for tuber formation. Summer heat stops growth. You can plant a spring crop and a fall crop, but not a continuous year-round crop.

Arkansas gardeners have a good window for growing potatoes. With proper timing, soil preparation, and care, you can enjoy fresh, homegrown potatoes from your own garden. Start planning now, and you will be rewarded with a bountiful harvest come summer.