For a sweet autumn harvest, turnip seeds should go into the ground as summer heat begins to wane. If you’re wondering when do you plant turnips in the fall, the timing is a balance of cool weather and enough growing days before a hard freeze. Getting this window right is the key to crisp, flavorful roots and tender greens.
This guide gives you the exact steps for fall turnip success. We will cover planting dates, variety selection, soil prep, and care through to harvest.
When Do You Plant Turnips In The Fall
The core principle for fall turnip planting is working backward from your first expected fall frost. Turnips are a cool-season crop that thrive in the shorter, cooler days of autumn. They develop their best flavor after a light frost.
To calculate your planting date, you need two pieces of information: your average first fall frost date and the “days to maturity” listed on your seed packet.
Calculating Your Perfect Fall Planting Date
First, find your local average first frost date. Your county extension service is a reliable source for this. Then, check your seed packet for the days to maturity. This number is usually for spring planting, so add 14 days as a buffer for fall’s shorter, cooler days.
Here is the simple formula:
Planting Date = First Frost Date – (Days to Maturity + 14 days)
For example, if your first frost is around October 20th and you choose a variety that matures in 50 days:
- 50 days (maturity) + 14 days (buffer) = 64 days total.
- Count back 64 days from October 20th.
- Your ideal planting window opens around August 17th.
This calculation ensures your turnips have enough time to size up properly before growth slows to a halt in freezing temperatures.
Regional Planting Windows For Fall Turnips
Climate zones vary greatly, so here is a general regional guide. Always use your frost date for the most accuracy.
Northeast And Upper Midwest
Plant from late July through mid-August. The short summer season means timing is critical to get a harvest before the deep freeze sets in.
Pacific Northwest
You have a longer, milder fall. Planting can often extend from early August into early September, especially for coastal areas.
Southern United States
Fall is the prime turnip season. Plant from late August through October, and even into November in the deepest South. The key is to wait for the intense summer heat to break.
Central Plains And Rockies
Aim for planting in August. Elevation will affect your frost date significantly, so adjust accordingly.
Understanding Soil Temperature For Germination
Turnip seeds germinate best in soil temperatures between 50°F and 85°F. In late summer, soil is usually warm, promoting quick sprouting. If you plant to late and soil is too cold, germination will be slow and uneven.
A simple soil thermometer can remove the guesswork. If you’re planting at the very tail end of your window, consider using a floating row cover to warm the soil slightly and protect young seedlings.
Choosing The Best Turnip Varieties For Autumn
Not all turnips are created equal, especially for fall harvesting. Some are bred for quick maturity, while others develop exceptional sweetness in the cold.
Fast-Maturing Varieties For Late Planting
If you’re getting a late start, these varieties will reach harvest size quickly:
- Tokyo Cross: A hybrid that matures in about 35 days. It produces smooth, white, mild roots.
- Hakurei: A famous salad turnip, ready in 38 days. It is incredibly sweet and tender, best eaten small.
- Purple Top White Globe: A classic reliable variety, maturing in 50-55 days. It stores very well.
Cold-Sweetened Heirloom Varieties
These varieties are known for their flavor improvement after frost:
- Golden Ball: A beautiful yellow-fleshed heirloom that becomes buttery and sweet after cold exposure. Matures in 50-60 days.
- Scarlet Queen: Stunning red-skinned roots with white flesh. It holds its color well when cooked and matures in about 45 days.
- Gilfeather: Actually a rutabaga-turnip cross, it is renowned for its exceptional sweet, mild flavor developed in cold fall weather.
Dual-Purpose Varieties For Roots And Greens
Many turnips offer a two-for-one harvest. You can selectively pick young leaves while the root develops.
- Shogoin: Prized primary for its large, tender greens, but it also produces a good white root. Excellent for southern growers.
- Seven Top: Grown almost exclusively for its prolific, flavorful greens, though it forms a small, woody root.
Preparing Your Garden Bed For Fall Turnips
Proper soil preparation sets the stage for healthy, unblemished roots. Turnips prefer loose, well-draining soil free of large clumps and rocks.
Soil Composition And Ph Balance
Turnips grow best in a sandy loam but will tolerate other soil types if well-amended. The ideal pH range is between 6.0 and 7.5. You can test your soil with a kit from a garden center.
If your soil is heavy clay, incorporate several inches of compost or well-rotted manure to improve drainage and texture. For very sandy soil, compost will help retain moisture and nutrients.
Fertilizing For Root Development
Use a balanced, low-nitrogen fertilizer. To much nitrogen encourages lush top growth at the expense of the root. A formula like 5-10-10 is ideal.
Work the fertilizer into the top 6 inches of soil a week before planting. Avoid fresh manure, as it can cause roots to fork and become misshapen.
Clearing And Tilling Techniques
Remove all previous crop debris and weeds. Till or turn the soil to a depth of at least 12 inches to loosen it. Break up any large clods and remove stones. The goal is a fine, crumbly seedbed.
Rake the area smooth just before sowing your seeds. A level surface makes planting at the correct depth much easier.
Step-By-Step Planting Instructions
With your bed prepared and seeds in hand, it’s time to plant. Follow these steps for the best results.
Direct Sowing Vs. Transplanting
Turnips should almost always be directly sown into the garden. They have a delicate taproot that doesn’t transplant well. Disturbing it can lead to forked or stunted roots.
Seed Depth And Spacing Guidelines
Sow seeds about 1/2 inch deep. You can plant them in two main patterns:
- Rows: Space rows 12 to 18 inches apart. Sow seeds thinly, about 1 inch apart within the row.
- Broadcast: Scatter seeds evenly over a prepared bed and lightly rake them in. This method is efficient for harvesting baby greens.
After germination, you will need to thin the seedlings. This is a crucial step that many gardeners skip, leading to crowded, small turnips.
The Critical Importance Of Thinning
Once seedlings are 3 to 4 inches tall, thin them to the proper spacing. For small salad turnips, leave 3 to 4 inches between plants. For larger storage varieties, leave 4 to 6 inches.
Use scissors to snip off unwanted seedlings at the soil line. This avoids disturbing the roots of the plants you want to keep. The thinnings are edible and make a great addition to salads.
Caring For Your Fall Turnip Crop
Consistent care after planting ensures your turnips grow steadily and without stress.
Watering Schedule For Optimal Growth
Turnips need consistent moisture for even growth and to prevent roots from becoming woody or bitter. Aim for about 1 inch of water per week, from rainfall or irrigation.
Water deeply and less frequently to encourage deep root growth. Use a soaker hose or drip irrigation to keep foliage dry, which helps prevent disease. Reduce watering as roots near maturity to concentrate their flavor.
Weed Control And Mulching Strategies
Weeds compete with young turnips for water and nutrients. Keep the bed weed-free, especially in the early stages. Hand-pull weeds carefully to avoid damaging the turnip’s shallow roots.
After thinning, apply a 2-inch layer of organic mulch, like straw or shredded leaves. This supresses weeds, retains soil moisture, and keeps the soil temperature more consistent as the weather cools.
Managing Common Pests And Diseases
Fall planting often avoids the worst insect problems, but a few pests may appear.
- Flea Beetles: These tiny jumping beetles create shotgun-like holes in leaves. Use floating row covers as a barrier from day one.
- Cabbage Root Maggots: The larvae feed on roots. Place a physical barrier, like a cloth collar, around each seedling at planting time.
- Aphids: Blast them off with a strong spray of water or use insecticidal soap.
For diseases like mildew or clubroot, practice crop rotation. Avoid planting turnips where other brassicas (cabbage, broccoli) grew in the last two years.
Timing Your Fall Turnip Harvest
One of the joys of fall turnips is that you can harvest them at multiple stages for different uses.
Signs Of Maturity In Turnip Roots
Turnips are ready when the root shoulders push up and out of the soil, showing their color (usually purple, white, or red). The root diameter at the shoulder is your best indicator.
- For baby turnips: Harvest at 1-2 inches in diameter.
- For full-sized roots: Harvest at 3-4 inches in diameter. Don’t let them grow to large, or they may become tough and fibrous.
Harvesting Turnip Greens Throughout The Season
You can begin harvesting greens when they are 4 to 6 inches tall. Never take more than one-third of the leaves from a single plant if you still want a root to develop.
Use a sharp knife to cut the outer leaves, leaving the central growing point intact. The greens are most tender when young and after a light frost.
How A Light Frost Improves Flavor
Cold temperatures trigger turnips to convert their starches into sugars, a natural antifreeze. This process makes the roots noticeably sweeter and milder. A few light frosts (temperatures between 28°F and 32°F) will significantly improve your harvest’s taste.
Storing And Preserving Your Autumn Harvest
With proper methods, you can enjoy your turnips long after the garden is dormant.
Short-Term Refrigeration Methods
For use within a few weeks, remove the greens (if attached), brush off excess soil, and store the unwashed roots in a perforated plastic bag in the refrigerator’s crisper drawer. The greens should be stored separately and used within a few days.
Long-Term Root Cellar Storage
For winter storage, choose perfect, unblemished roots. Twist off the tops, leaving about an inch of stem. Do not wash them. Pack the turnips in damp sand, peat moss, or sawdust in a wooden box or plastic bin. Store them in a cold (32°F-40°F), humid location like a root cellar or unheated basement.
Freezing And Pickling Turnips
Turnips can be blanched and frozen for up to 8 months. Peel and cube them, blanch for 2 minutes, cool quickly, and pack into freezer bags.
Pickling is another excellent option. Turnips pickle beautifully, often paired with carrots and garlic in a simple brine. Fermented turnips, like in kimchi, are also a tasty way to preserve them.
Frequently Asked Questions
Can You Plant Turnips In October?
In many regions, yes. In the South and mild coastal areas, October planting is standard. In colder zones, it is only possible if you use cold frames or heavy row covers for protection. Always check your days-to-frost window first.
What Is The Latest Date To Plant Turnips For Fall?
The latest date is roughly 6-8 weeks before your first hard frost (below 28°F). This allows time for roots to form a usable size, even if they remain small. For greens only, you can plant up to 4 weeks before the frost.
How Long Do Turnips Take To Grow In The Fall?
Most varieties take 45 to 60 days from seed to harvestable root in fall conditions. Remember that growth slows as daylight decreases and temperatures drop, so always add that 14-day buffer to the packet’s “days to maturity.”
Do Turnips Grow Back After Harvesting?
No, the entire plant is harvested when you pull the root. However, if you are only harvesting leaves, the plant will continue to produce new growth from the center as long as the root remains healthy and the weather permits.
Can Turnips Survive A Freeze?
Turnips are very frost-tolerant. The roots can survive a hard freeze (mid-20s°F) if mulched heavily with straw or leaves. The tops will be damaged by a hard freeze, but the protected root underground may still be harvestable for a while after.