Illinois offers two distinct planting seasons for cabbage, each requiring different strategies for success. Knowing the Best Time To Plant Cabbage In Illinois is crucial for a healthy harvest. This guide breaks down everything you need to know for spring and fall crops.
Cabbage is a cool-season crop that thrives in moderate temperatures. It can handle light frosts, which makes it perfect for early spring and late summer planting. But timing is everything in Illinois, where weather can swing wildly.
If you plant too early in spring, a hard freeze might kill your seedlings. Plant too late in fall, and the cabbage won’t mature before winter hits. Let’s get the timing right for your garden.
Best Time To Plant Cabbage In Illinois
The exact timing depends on where you live in Illinois. The state spans USDA hardiness zones 5a in the north to 7a in the south. Northern Illinois, including Chicago and Rockford, has a shorter growing season. Southern Illinois, near Cairo and Carbondale, warms up faster.
For spring planting, aim for 2 to 4 weeks before the last expected frost. In northern Illinois, that’s usually mid-April. In southern Illinois, you can plant as early as late March. Fall planting should happen 6 to 8 weeks before the first expected frost, which is typically mid-August in the north and early September in the south.
Spring Planting Window For Northern Illinois
In northern Illinois, the last frost often occurs between April 15 and May 1. Start your cabbage seeds indoors 4 to 6 weeks before that. Transplant seedlings outdoors around mid-April. This gives them time to establish before summer heat arrives.
Use a soil thermometer to check the ground temperature. Cabbage seeds germinate best when soil is at least 45°F. If the soil is too cold, seeds rot. Wait until the soil warms up, even if the calendar says it’s time.
Spring Planting Window For Southern Illinois
Southern Illinois has a milder climate. The last frost typically happens between March 20 and April 10. You can transplant cabbage outdoors in late March or early April. Start seeds indoors in late January or early February.
Watch out for sudden warm spells. Cabbage bolts, or goes to seed, when temperatures spike. If a heatwave hits, your plants might not form good heads. Plant early enough to avoid this risk.
Fall Planting Window For The Whole State
Fall cabbage is often sweeter because cool weather increases sugar content. For a fall harvest, plant seeds directly in the garden in mid-to-late summer. In northern Illinois, direct sow seeds around July 15 to August 1. In southern Illinois, aim for August 1 to September 1.
Transplants can be set out a bit later. Use the same 6 to 8 week window before the first frost. The first frost in northern Illinois is usually around October 1 to 15. In southern Illinois, it’s typically October 15 to November 1.
Factors That Affect Cabbage Planting Time
Several factors can shift your planting schedule. Pay attention to these to avoid common mistakes.
Soil Temperature
Cabbage seeds need soil temperatures between 45°F and 85°F for germination. The sweet spot is 70°F to 80°F. If the soil is too cold, seeds take longer to sprout. Use a soil thermometer to be sure.
For transplants, soil temperature matters less. But cold soil can stunt growth. Wait until the ground is workable and not waterlogged. Wet, cold soil leads to root rot.
Frost Dates
Know your local frost dates. The USDA has a frost date map, but local weather patterns vary. Check with your county extension office for precise dates. They often have data for your specific area.
Keep in mind that frost dates are averages. A late frost can happen after the average date. Be ready to cover your plants with row covers or blankets if a freeze is predicted.
Cabbage Variety
Different cabbage varieties have different maturity times. Early varieties like ‘Early Jersey Wakefield’ mature in 60 to 70 days. Late varieties like ‘Savoy’ can take 80 to 100 days. Choose varieties that fit your growing season.
For spring planting, use early-maturing varieties. They finish before summer heat. For fall planting, use late-maturing varieties. They handle cool weather well and store longer.
Step-By-Step Guide For Planting Cabbage In Illinois
Follow these steps for a successful cabbage crop. Each step is simple and practical.
Step 1: Choose The Right Location
Pick a spot with full sun, at least 6 hours of direct sunlight daily. Cabbage needs sun to form dense heads. The soil should be rich, well-draining, and have a pH between 6.0 and 7.5. Test your soil if you are unsure.
Avoid planting where other brassicas (broccoli, kale, cauliflower) grew recently. This reduces disease risk. Rotate your crops every 3 to 4 years.
Step 2: Prepare The Soil
Work the soil to a depth of 8 to 10 inches. Mix in 2 to 4 inches of compost or well-rotted manure. Cabbage is a heavy feeder and needs lots of nutrients. Add a balanced fertilizer, like 10-10-10, at planting time.
If your soil is heavy clay, add sand or perlite to improve drainage. Raised beds work well for cabbage. They warm up faster in spring and drain better.
Step 3: Start Seeds Or Buy Transplants
You can start seeds indoors or buy transplants from a nursery. Starting indoors gives you more variety choices. Sow seeds ¼ inch deep in seed-starting mix. Keep them moist and warm, around 70°F.
Transplants are easier for beginners. Look for stocky plants with dark green leaves. Avoid leggy or yellowed plants. They might not transplant well.
Step 4: Harden Off Seedlings
Before planting outdoors, harden off your seedlings. This means gradually exposing them to outdoor conditions. Start with 1 hour of outdoor time, then increase by 1 hour each day over a week.
Protect them from strong wind and direct sun at first. Hardening off reduces transplant shock. Your plants will grow stronger and faster.
Step 5: Plant At The Right Depth
Dig holes slightly deeper than the root ball. Space plants 12 to 24 inches apart, depending on the variety. Rows should be 24 to 36 inches apart. Bury the stem up to the first set of true leaves. This encourages more root growth.
Water thoroughly after planting. Keep the soil consistently moist, not soggy. Mulch around the plants to retain moisture and suppress weeds.
Step 6: Care For Your Cabbage
Cabbage needs regular watering, about 1 to 1.5 inches per week. Water at the base to avoid wetting the leaves, which can cause disease. Use drip irrigation or a soaker hose for best results.
Fertilize every 3 to 4 weeks with a nitrogen-rich fertilizer. Side-dress with compost or fish emulsion. Watch for pests like cabbage worms and aphids. Use row covers or insecticidal soap if needed.
Common Mistakes When Planting Cabbage In Illinois
Avoid these pitfalls to keep your cabbage healthy.
- Planting too early in spring. A late frost can kill young plants. Wait until the soil is warm enough.
- Planting too late in spring. Summer heat causes bolting. Harvest before temperatures hit 80°F regularly.
- Overcrowding plants. Crowded cabbage heads are small and loose. Give each plant enough space.
- Underwatering. Cabbage needs consistent moisture. Dry soil leads to tough, bitter leaves.
- Ignoring pests. Cabbage worms can destroy a crop quickly. Check plants daily and act fast.
Harvesting Cabbage At The Right Time
Harvest when the heads are firm and solid. Squeeze them gently. If they feel soft, wait a few more days. Cut the head at the base with a sharp knife. Leave the outer leaves in place for a second harvest of small side heads.
In spring, harvest before temperatures exceed 80°F. In fall, you can leave cabbage in the ground after light frosts. Frost improves flavor. But harvest before a hard freeze, below 25°F, which can damage the heads.
Frequently Asked Questions
Can I plant cabbage in July in Illinois?
Yes, for a fall harvest. In northern Illinois, plant seeds in mid-July. In southern Illinois, wait until early August. This gives cabbage time to mature before frost.
What is the best cabbage variety for Illinois?
Early varieties like ‘Golden Acre’ and ‘Stonehead’ work well for spring. For fall, try ‘Late Flat Dutch’ or ‘Savoy’. These handle cool weather and store well.
How long does cabbage take to grow in Illinois?
Most varieties take 60 to 100 days from transplanting. Early varieties are faster. Check the seed packet for exact days to maturity.
Should I start cabbage seeds indoors or direct sow?
For spring, start seeds indoors 4 to 6 weeks before the last frost. For fall, direct sow in the garden. Transplants give you a head start in spring.
Can cabbage survive a frost in Illinois?
Yes, cabbage can survive light frosts down to 28°F. Hard freezes below 25°F can damage the heads. Cover plants if a hard freeze is predicted.
Final Tips For Success
Keep a garden journal. Note your planting dates, weather patterns, and harvest times. Over time, you will learn the best timing for your specific location. Every garden is a little different.
Join a local gardening group or talk to neighbors. They can share tips for your area. The Illinois Extension office also offers free resources. Use them to refine your planting schedule.
Remember that the Best Time To Plant Cabbage In Illinois is not a single date. It is a window that depends on your zone, the weather, and your chosen variety. Be flexible and observant. Your cabbage will thank you.
With a little planning, you can enjoy fresh cabbage from your garden in both spring and fall. Start small, learn as you go, and soon you will be a cabbage-growing pro. Happy planting!