Best Time To Plant Turnip In Indiana

Indiana’s frost dates provide a clear window for turnips to mature before winter. Knowing the best time to plant turnip in Indiana is the difference between a crisp, sweet harvest and a tough, woody disappointment. Turnips thrive in cool weather, so timing your planting around the state’s unique climate zones is essential.

Turnips are a root crop that actually gets sweeter after a light frost. This makes Indiana’s fall season perfect for them. But if you plant too late, the ground freezes before they mature. Plant too early in spring, and they might bolt or become pithy.

This guide breaks down the exact planting windows for every part of Indiana. You will learn about soil temperatures, frost dates, and variety selection. Let’s get your turnips in the ground at the perfect moment.

The best time to plant turnip in Indiana falls into two main seasons: early spring and late summer. For a fall harvest, which most gardeners prefer, aim for a window from mid-July to mid-August. For spring turnips, plant as soon as the soil is workable, typically late March to early April.

Why two seasons? Turnips need about 50 to 60 days to mature. They grow best when temperatures are between 50°F and 65°F. Indiana’s hot summers cause turnips to become tough and bitter. So, you either plant early enough to beat the heat, or late enough to grow into cool autumn weather.

Here are the key factors that determine your exact planting date:

Your Indiana hardiness zone (5a to 6b)
Last spring frost date (average)
First fall frost date (average)
Turnip variety maturity time

Spring Planting Window For Indiana

For spring turnips, you want to plant 2 to 4 weeks before your last expected frost. Turnip seeds can germinate in soil as cold as 40°F, though they prefer 50°F to 75°F. A light frost won’t hurt young seedlings.

In northern Indiana (zones 5a-5b), last frost typically occurs around May 10 to May 20. So, plant spring turnips from early April to mid-April. In central Indiana (zone 5b-6a), last frost is around April 20 to May 5. Plant from late March to mid-April. In southern Indiana (zone 6a-6b), last frost is around April 10 to April 20. Plant from mid-March to early April.

Spring turnips are best harvested when small, about 2 to 3 inches in diameter. They mature quickly, often in 40 to 50 days for early varieties. But spring turnips can turn woody if left in the ground too long as summer heat arrives.

Fall Planting Window For Indiana

Fall is the preferred season for most Indiana turnip growers. The cooler temperatures and light frosts produce sweeter, more tender roots. The key is to time your planting so turnips mature just before or after the first hard freeze.

Count backwards from your first fall frost date. Turnips need 50 to 60 days to mature. Add about 10 extra days for slower germination in warmer August soil. So, plan for 60 to 70 days before your first frost.

For northern Indiana, first frost is around October 1 to October 15. Plant fall turnips from mid-July to early August. For central Indiana, first frost is around October 10 to October 25. Plant from late July to mid-August. For southern Indiana, first frost is around October 20 to November 5. Plant from early August to late August.

If you plant too early in August, the hot soil can cause poor germination. If you plant too late, the roots won’t size up before the ground freezes. A good rule of thumb: plant fall turnips about 8 to 10 weeks before your average first frost date.

Soil Temperature Matters

Turnip seeds germinate best when soil temperatures are between 50°F and 85°F. The ideal range is 60°F to 75°F. In Indiana’s late July and August, soil can easily exceed 85°F. This can cause spotty germination or seeds that rot.

To check soil temperature, use a simple soil thermometer. Insert it 2 inches deep in the morning. If it’s above 85°F, wait for a cooler spell or water the soil deeply to cool it down. Planting after a rain or in the evening can help.

If you must plant in hot soil, consider these tips:

Water the planting area thoroughly the night before
Plant seeds slightly deeper, about ½ inch instead of ¼ inch
Mulch lightly with straw to keep soil cool
Water regularly to maintain moisture

Indiana Climate Zones And Turnip Timing

Indiana spans three main USDA hardiness zones: 5a, 5b, and 6a, with small areas of 6b in the far south. This affects your planting calendar. Let’s break it down by region.

Northern Indiana (Zones 5A-5b)

This region includes cities like South Bend, Fort Wayne, and Gary. The growing season is shorter, about 150 to 170 days. Spring comes later and fall arrives earlier.

For spring turnips, plant from April 1 to April 15. Harvest by late May to early June. For fall turnips, plant from July 15 to August 1. Harvest from late September to mid-October. You might get a light frost before Halloween, but turnips can handle it.

Choose faster-maturing varieties for this region. Look for turnips that mature in 45 to 50 days. Examples include ‘Purple Top White Globe’ (50 days) and ‘Tokyo Cross’ (35 days).

Central Indiana (Zones 5B-6a)

This region includes Indianapolis, Bloomington, and Muncie. The growing season is moderate, about 170 to 190 days. You have more flexibility with planting dates.

For spring turnips, plant from March 25 to April 10. Harvest by mid-May to early June. For fall turnips, plant from July 25 to August 15. Harvest from late September to late October. You can often harvest into early November if the weather is mild.

Central Indiana gardeners can try both spring and fall crops. The fall crop usually produces the best quality roots. Consider ‘Hakurei’ (38 days) for a sweet, salad turnip, or ‘Golden Ball’ (60 days) for storage.

Southern Indiana (Zones 6A-6b)

This region includes Evansville, New Albany, and Jeffersonville. The growing season is longer, about 190 to 210 days. You can plant later in fall and earlier in spring.

For spring turnips, plant from March 15 to April 1. Harvest by early May. For fall turnips, plant from August 1 to August 25. Harvest from late September to early November. You might even harvest into December if you protect the bed with a cold frame.

Southern Indiana’s longer season allows for succession planting. Plant a small batch every two weeks from August 1 to September 1. This gives you a continuous harvest of tender turnips.

Turnip Varieties For Indiana Gardens

Not all turnips are created equal. Some are better for spring, some for fall, and some for storage. Choose varieties based on your planting season and taste preferences.

Best Spring Turnip Varieties

Spring turnips need to mature quickly before heat arrives. Look for fast-growing, bolt-resistant varieties.

Tokyo Cross: Matures in 35 days. Small, white, and very sweet. Perfect for salads.
Hakurei: Matures in 38 days. Japanese salad turnip. Crisp and mild, even raw.
Purple Top White Globe: Matures in 50 days. Classic turnip. Good for cooking.
White Egg: Matures in 45 days. Oval shape, mild flavor.

Best Fall Turnip Varieties

Fall turnips can take a bit longer to mature. They benefit from cooler weather and frost.

Purple Top White Globe: Still a top choice. Stores well.
Golden Ball: Matures in 60 days. Yellow flesh, sweet, good for storage.
Gilfeather: Matures in 70 days. Heirloom variety. Very sweet after frost.
Seven Top: Grown mainly for greens. Matures in 45 days for leaves.

Turnip Greens In Indiana

If you want turnip greens, plant in late summer for a fall harvest. Greens are ready in 30 to 40 days. You can also plant a dedicated greens variety like ‘Seven Top’ or ‘Shogoin’.

For spring greens, plant early and harvest leaves when they are 4 to 6 inches tall. Don’t pull the whole plant; just cut the outer leaves. This allows the root to keep growing.

Step-By-Step Planting Guide For Indiana

Follow these steps for a successful turnip crop in Indiana soil.

Preparing The Soil

Turnips prefer loose, well-drained soil with a pH between 6.0 and 7.5. Heavy clay soil can cause misshapen roots. If your soil is clay, consider raised beds or add compost.

Test your soil pH. Add lime if below 6.0.
Remove rocks and debris. Turnips need clear soil to grow straight.
Work in 2 to 3 inches of compost or aged manure.
Rake the bed smooth. Turnip seeds are small and need fine soil.

Sowing The Seeds

Turnip seeds are tiny. Plant them directly in the garden. They don’t transplant well.

Make shallow furrows about ¼ to ½ inch deep.
Space rows 12 to 18 inches apart.
Sow seeds thinly, about 1 seed per inch.
Cover with fine soil and pat gently.
Water with a gentle spray to avoid washing seeds away.

Thinning Seedlings

Once seedlings emerge (in 4 to 10 days), thin them. Crowded turnips produce small, twisted roots.

Thin to 2 to 4 inches apart for small turnips.
Thin to 4 to 6 inches apart for larger storage turnips.
Use scissors to cut unwanted seedlings. Pulling can disturb roots.
Eat the thinnings! They are delicious in salads.

Watering And Care

Turnips need consistent moisture. Inconsistent watering causes tough, bitter roots.

Water 1 inch per week if no rain.
Mulch with straw to retain moisture and keep soil cool.
Watch for flea beetles. They make small holes in leaves. Use row covers if needed.
Fertilize lightly with a balanced fertilizer (10-10-10) at planting time.

Harvesting Turnips At The Right Time

Harvest time depends on variety and size preference. Most turnips are best when 2 to 3 inches in diameter. Larger turnips can become woody.

For spring turnips, harvest as soon as they reach size. Don’t let them sit in summer heat. For fall turnips, you can leave them in the ground after a light frost. This increases sweetness. But harvest before a hard freeze (below 28°F) damages the roots.

To harvest, loosen the soil with a garden fork. Gently pull the turnip by the greens. Cut off the greens, leaving 1 inch of stem. Greens can be stored separately for a few days.

Common Turnip Growing Problems In Indiana

Even with perfect timing, issues can arise. Here are common problems and solutions.

Poor Germination

If seeds don’t sprout, the soil might be too hot or too dry. In late summer, water deeply before planting. Consider pre-sprouting seeds on a damp paper towel for 2 days.

Woody Or Bitter Roots

This happens when turnips are left in the ground too long, or when they experience heat stress. Harvest on time. Plant fall crops to avoid summer heat.

Pests

Flea beetles are the most common pest. They create tiny holes in leaves. Use row covers or diatomaceous earth. Aphids can also appear. Spray with insecticidal soap.

Diseases

Club root is a soil-borne disease that causes swollen, distorted roots. Rotate crops. Don’t plant turnips in the same spot for 3 years. Downy mildew can occur in wet weather. Improve air circulation by thinning plants.

Frequently Asked Questions

What is the best time to plant turnips in Indiana for a fall harvest?

The best time is 8 to 10 weeks before your first fall frost. For most of Indiana, that’s mid-July to mid-August. Northern areas plant earlier, southern areas later.

Can I plant turnips in the spring in Indiana?

Yes. Plant spring turnips 2 to 4 weeks before the last frost. That’s late March to mid-April depending on your zone. Harvest before summer heat arrives.

How late can I plant turnips in Indiana?

You can plant as late as early September in southern Indiana, but only if you choose a very fast-maturing variety (35 to 40 days). In northern Indiana, stop planting by mid-August.

Do turnips need full sun in Indiana?

Turnips grow best in full sun (6 to 8 hours daily). They can tolerate partial shade, but roots will be smaller. For best yields, choose a sunny spot.

What happens if I plant turnips too early in spring?

If soil is too cold (below 40°F), seeds may rot. If they germinate and then a hard freeze hits (below 28°F), seedlings can die. Wait until soil is workable and frost danger is low.

Final Tips For Indiana Turnip Growers

Timing is everything. The best time to plant turnip in Indiana is not a single date but a window that depends on your location and season. Use your local frost dates as a guide.

Keep a garden journal. Note when you planted, when the first frost came, and how the turnips turned out. Over a few years, you’ll dial in the perfect dates for your specific microclimate.

Don’t forget the greens. Turnip greens are nutritious and easy to grow. Plant extra seeds for a dual-purpose crop. Harvest greens when young for the best flavor.

Experiment with different varieties. ‘Hakurei’ is a game-changer for those who think they don’t like turnips. It’s sweet, crisp, and mild. ‘Golden Ball’ is excellent for storage.

Finally, enjoy the process. Turnips are one of the easiest root crops to grow. With the right timing, you’ll have a bountiful harvest that tastes like autumn in Indiana.