When To Plant Potatoes In Tennessee

Potatoes in Tennessee go into the ground in late March through early April. Knowing exactly when to plant potatoes in Tennessee can make the difference between a big harvest and a disappointing one. The state’s varied climate means timing matters a lot, from the mountains in the east to the warmer west.

This guide covers everything you need to know about planting potatoes in Tennessee. You will learn the best dates, soil preparation, variety choices, and care tips. Let’s get started.

The exact timing depends on your location within Tennessee. The state spans USDA hardiness zones 6a in the east to 7b in the west. This affects when the soil warms up enough for planting.

For most of Tennessee, the ideal planting window is late March to early April. You want the soil temperature to be at least 45°F (7°C) at a depth of 4 inches. Planting too early risks rot from cold, wet soil. Planting too late means smaller tubers and reduced yields.

Planting Dates By Region

Here is a breakdown for different parts of Tennessee:

East Tennessee (Zone 6a-6b): Plant from late March to mid-April. The higher elevation means cooler soil, so wait until the frost danger has passed.
Middle Tennessee (Zone 6b-7a): Plant from mid-March to early April. This region has a slightly longer growing season.
West Tennessee (Zone 7a-7b): Plant from early to mid-March. Warmer winters allow for earlier planting.

Always check your local frost dates. A light frost can kill young potato plants. Use a soil thermometer to be sure. If you don’t have one, watch for when the soil is dry enough to crumble in your hand, not clump into mud.

Why Soil Temperature Matters

Potatoes are cool-season crops, but they don’t like freezing. The seed pieces need soil above 45°F to sprout properly. Cold soil slows growth and invites disease. Warmer soil, around 50-55°F, speeds up emergence and reduces rot risk.

If you plant too early, the seed pieces may rot before they sprout. If you plant too late, the plants will struggle in the summer heat. Tennessee summers get hot, and potatoes stop growing when soil temps exceed 80°F.

Choosing The Right Potato Varieties For Tennessee

Not all potatoes grow well in Tennessee’s climate. You need varieties that mature before the summer heat arrives. Here are some top choices:

Early Season Varieties (60-80 Days)

Yukon Gold: A popular all-purpose potato with buttery flavor. Matures in about 70 days.
Red Norland: A red-skinned potato that produces well in warm weather. Ready in 65-80 days.
Kennebec: A white potato great for baking and frying. Matures in 70-85 days.

Mid-Season Varieties (80-90 Days)

Russet Burbank: The classic baking potato. Needs a bit more time but does well in Tennessee.
Red Pontiac: A heavy yielder with red skin. Good for boiling and salads.
German Butterball: A yellow-fleshed potato with rich flavor. Matures in 85 days.

Late Season Varieties (90-110 Days)

Katahdin: A white potato that stores well. Good for fall planting in some areas.
Butte: A russet variety with excellent flavor. Needs a long season, so plant early.

For Tennessee, stick with early and mid-season varieties. They will finish before the heat stress them out. Late season varieties are riskier but can work if you plant in early March in west Tennessee.

Preparing Your Soil For Potatoes

Good soil preparation is key to a strong harvest. Potatoes need loose, well-drained soil with plenty of organic matter. Here is how to get your garden ready:

Soil Testing And Amendments

Start with a soil test. Potatoes prefer a pH between 5.0 and 6.0. If your soil is too alkaline, add sulfur. If it is too acidic, add lime. Test kits are available at garden centers or through your local extension office.

Add compost or well-rotted manure a few weeks before planting. This improves drainage and adds nutrients. Avoid fresh manure, as it can burn the roots and introduce diseases.

Tilling And Bed Preparation

Loosen the soil to a depth of 8-10 inches. Remove rocks and large clods. Potatoes need room to expand underground. If your soil is heavy clay, consider raised beds. They warm up faster and drain better.

Create rows spaced 2-3 feet apart. Within each row, dig a trench about 4-6 inches deep. Place the seed pieces in the trench, eyes facing up, spaced 10-12 inches apart.

How To Plant Potatoes Step By Step

Follow these steps for a successful planting:

Buy certified seed potatoes. These are disease-free and produce better yields. Avoid grocery store potatoes, as they may carry diseases.
Cut seed potatoes into pieces. Each piece should have at least two eyes. Let the cut pieces dry for 1-2 days before planting. This prevents rot.
Prepare the trenches. Dig them 4-6 inches deep in your prepared soil.
Place the seed pieces. Put them in the trench, cut side down, eyes up. Space them 10-12 inches apart.
Cover with soil. Fill the trench with 3-4 inches of soil. Do not fill it completely yet. As the plants grow, you will mound soil around them.
Water thoroughly. Give the area a good soak after planting. Keep the soil moist but not soggy.

Hilling Potatoes For Better Yields

Hilling is important for potato growth. It prevents tubers from turning green from sunlight exposure. It also encourages more tuber formation along the buried stem.

When the plants are about 6 inches tall, mound soil around the base, covering the lower 4 inches of the stem. Repeat this process every 2-3 weeks until the plants flower. Stop hilling once the flowers appear.

Caring For Your Potato Plants

Once planted, potatoes need consistent care. Here is what to focus on:

Watering

Potatoes need about 1-2 inches of water per week. Keep the soil evenly moist, especially during flowering and tuber formation. Inconsistent watering can cause knobby or misshapen tubers.

Water at the base of the plants to avoid wetting the leaves. Wet foliage encourages blight and other fungal diseases. Drip irrigation or soaker hoses work best.

Fertilizing

Potatoes are heavy feeders. Apply a balanced fertilizer (like 10-10-10) at planting time. Side-dress with additional nitrogen when the plants are 6 inches tall. Avoid too much nitrogen, which leads to lush foliage but small tubers.

Organic options include fish emulsion or compost tea. Apply every 3-4 weeks during the growing season.

Weed Control

Weeds compete with potatoes for water and nutrients. Keep the area weed-free, especially early in the season. Mulch with straw or grass clippings to suppress weeds and retain moisture.

Be careful when weeding near the plants. Potato roots are shallow and easily damaged. Hand-pull weeds close to the stems.

Common Pests And Diseases In Tennessee

Tennessee’s humid climate can bring challenges. Here are the most common issues and how to handle them:

Colorado Potato Beetle

These yellow-and-black striped beetles are a major pest. They eat leaves and can defoliate plants quickly. Hand-pick adults and larvae off the plants. Use neem oil or insecticidal soap for severe infestations.

Flea Beetles

Small, jumping beetles that chew small holes in leaves. They are more common in dry weather. Use row covers to protect young plants. Diatomaceous earth can also help.

Early Blight

A fungal disease that causes dark spots on leaves. It thrives in warm, wet weather. Prevent it by spacing plants for good air circulation. Remove infected leaves immediately. Copper fungicide can help if applied early.

Late Blight

A more serious disease that can destroy a crop. It appears as water-soaked spots on leaves and stems. Avoid overhead watering. Remove and destroy infected plants. Plant resistant varieties like ‘Kennebec’ or ‘Elba’.

Scab

A bacterial disease that causes rough, corky patches on tubers. It is more common in alkaline soil. Keep your soil pH below 6.0. Plant resistant varieties like ‘Russet Burbank’ or ‘Yukon Gold’.

When To Harvest Potatoes In Tennessee

Harvest time depends on the variety and when you planted. Most potatoes are ready 70-100 days after planting. Here is how to know when to dig them up:

New Potatoes (Early Harvest)

You can harvest new potatoes about 2-3 weeks after the plants flower. These are small, tender, and perfect for boiling. Gently dig around the base of the plant to find them. Do not disturb the whole plant if you want to continue growing the rest.

Main Crop Potatoes (Full Harvest)

Wait until the plant tops die back and turn yellow. This usually happens in late June to early July in Tennessee. Cut the stems to the ground and leave the tubers in the ground for 1-2 weeks. This allows the skins to thicken for better storage.

Dig the potatoes on a dry day. Use a garden fork to loosen the soil, then lift the tubers gently. Avoid bruising them, as damaged potatoes rot quickly.

Storing Your Potato Harvest

Proper storage extends the life of your potatoes. Follow these tips:

Cure the potatoes: Place them in a dark, well-ventilated area at 50-60°F for 1-2 weeks. This heals minor cuts and thickens the skin.
Store in a cool, dark place: Ideal storage temperature is 40-45°F. A basement or root cellar works well. Do not refrigerate, as cold temperatures convert starch to sugar.
Keep them dry: Moisture causes rot. Store potatoes in a paper bag, burlap sack, or cardboard box with ventilation holes.
Separate from onions: Onions release gases that cause potatoes to sprout faster. Store them separately.

Check your stored potatoes regularly. Remove any that show signs of rot or sprouting. Properly stored potatoes can last 3-6 months.

Fall Planting Potatoes In Tennessee

Some Tennessee gardeners try a fall planting for a second harvest. This works best in west Tennessee with its longer growing season. Plant in late July to early August for a harvest before the first frost.

Fall planting has challenges. The summer heat can stress young plants. Keep them well-watered and shaded if possible. Use early-maturing varieties like ‘Red Norland’ or ‘Yukon Gold’.

Harvest fall potatoes before the first hard frost, usually in late October or early November. They may not store as well as spring-planted ones, but they are great for immediate use.

Frequently Asked Questions

Can I plant potatoes in Tennessee in the fall?

Yes, but only in warmer parts of the state like west Tennessee. Plant in late July to early August and harvest before the first frost. Use early-maturing varieties for best results.

How deep should I plant potatoes in Tennessee?

Plant seed pieces 4-6 inches deep in a trench. Cover with 3-4 inches of soil initially, then hill soil around the plants as they grow. This encourages more tuber formation.

What is the best potato variety for Tennessee?

Yukon Gold and Red Norland are top choices. They mature quickly and handle Tennessee’s heat well. Kennebec is also a good option for its disease resistance.

Do I need to water potatoes every day?

No. Potatoes need about 1-2 inches of water per week. Water deeply once or twice a week, depending on rainfall. Consistent moisture is more important than frequency.

How do I know when potatoes are ready to harvest?

For new potatoes, harvest 2-3 weeks after flowering. For full-sized potatoes, wait until the plant tops die back and turn yellow. This usually happens 70-100 days after planting.

Final Tips For Success

Growing potatoes in Tennessee is rewarding if you get the timing right. Start with good seed potatoes, prepare your soil well, and plant at the right time for your region. Keep the plants watered and weed-free, and watch for pests and diseases.

Remember that the key is soil temperature. Wait until it reaches at least 45°F at 4 inches deep. Use a thermometer to be sure. With proper care, you will have a bountiful harvest of fresh, homegrown potatoes.

If you are new to gardening, start with a small patch. Potatoes are forgiving and fun to grow. You can always expand next year. Happy planting in Tennessee.