Wisconsin cabbage thrives when planted in early May, just after the last spring frost passes. Knowing the best time to plant cabbage in wisconsin is crucial for a successful harvest. This guide walks you through everything you need to know for perfect timing.
Cabbage is a cool-season crop that actually tastes better after a light frost. But planting too early or too late can ruin your heads. Let’s break down the exact dates and methods for Wisconsin’s unique climate.
Best Time To Plant Cabbage In Wisconsin
The best time to plant cabbage in wisconsin depends on your specific region. The state spans USDA hardiness zones 3b through 5b. Southern Wisconsin warms up faster than the northern counties near Lake Superior.
For spring planting, aim for 2 to 4 weeks before the last expected frost. In southern Wisconsin, that’s typically mid-April to early May. In northern Wisconsin, wait until early to mid-May.
For fall cabbage, count backward from the first fall frost. You want the heads to mature before temperatures drop below 20°F. Plant fall cabbage in late June or early July in the south, and early to mid-June in the north.
Understanding Wisconsin’s Frost Dates
Frost dates vary widely across the state. Here are general guidelines for different regions:
- Southern Wisconsin (Madison, Milwaukee, Janesville): Last spring frost around April 20–May 5. First fall frost around October 1–15.
- Central Wisconsin (Wausau, Stevens Point): Last spring frost around May 1–15. First fall frost around September 20–October 5.
- Northern Wisconsin (Eau Claire, Superior, Rhinelander): Last spring frost around May 15–June 1. First fall frost around September 10–25.
Always check your local extension office for precise dates. Microclimates near lakes or hills can shift these windows by a week or two.
Spring Planting Schedule
Spring cabbage needs cool weather to form tight heads. Here’s a step-by-step schedule:
- Start seeds indoors: 6–8 weeks before your last frost date. For southern Wisconsin, start seeds in early March. For northern areas, start in late March.
- Harden off seedlings: About 10 days before transplanting. Move them outside for a few hours each day, gradually increasing time.
- Transplant outdoors: 2–4 weeks before the last frost. Cabbage can handle light frosts down to 25°F.
- Direct sow seeds: If you prefer, sow seeds directly in the garden 4–6 weeks before the last frost. Cover with row covers if a hard freeze is predicted.
For most Wisconsin gardeners, transplanting in early May works perfectly. The soil should be workable and not waterlogged.
Fall Planting Schedule
Fall cabbage often produces sweeter, denser heads. The cooler autumn temperatures reduce bitterness. Here’s how to time it:
- Count backward: Determine your first fall frost date. For southern Wisconsin, that’s around October 10. For northern areas, around September 20.
- Calculate maturity: Most cabbage varieties take 70–90 days to mature. Add 10–14 days for fall planting because growth slows in cooler weather.
- Plant accordingly: For a 80-day variety in southern Wisconsin, plant around July 10–20. In northern Wisconsin, plant around June 20–July 5.
- Direct sow or transplant: Fall cabbage can be direct seeded in mid-summer. Keep the soil moist until germination.
Fall cabbage benefits from shade cloth during hot July days. This prevents stress and bolting.
Factors That Affect Planting Time
Several variables can shift your ideal planting window. Consider these before putting seeds in the ground.
Soil Temperature
Cabbage seeds germinate best when soil is between 45°F and 85°F. The ideal range is 60–70°F. If the soil is too cold, seeds rot. If too hot, germination drops.
Use a soil thermometer to check. In Wisconsin, soil typically reaches 50°F by mid-April in the south and early May in the north. Wait until the soil is at least 45°F before planting.
Variety Selection
Different cabbage varieties have different maturity times. This affects when you should plant. Choose varieties suited to Wisconsin’s short growing season.
- Early varieties (60–70 days): ‘Golden Acre’, ‘Early Jersey Wakefield’. Plant these for spring harvest.
- Mid-season varieties (70–85 days): ‘Red Acre’, ‘Savoy King’. Good for both spring and fall.
- Late varieties (85–100 days): ‘Danish Ballhead’, ‘Brunswick’. Best for fall harvest and storage.
For spring planting, choose early or mid-season varieties. For fall, mid-season or late varieties work well.
Weather Patterns
Wisconsin weather is unpredictable. A warm spell in March can tempt you to plant early. But a late frost in May can kill unprotected seedlings.
Watch the 10-day forecast before transplanting. If temperatures are predicted to drop below 25°F, delay planting or use row covers. Cabbage can survive light frosts, but hard freezes damage the growing point.
In recent years, Wisconsin has seen later spring frosts. Some gardeners now wait until mid-May even in southern areas. It’s better to be safe than sorry.
Step-By-Step Planting Guide
Follow these steps for successful cabbage planting in Wisconsin.
Preparing The Garden Bed
Cabbage needs full sun and rich, well-draining soil. Prepare your bed 2–3 weeks before planting.
- Choose a spot that gets at least 6 hours of direct sunlight daily.
- Test soil pH. Cabbage prefers 6.0–6.8. Add lime if needed.
- Work in 2–3 inches of compost or well-rotted manure.
- Add a balanced fertilizer like 10-10-10 at 1 pound per 100 square feet.
- Rake the bed smooth and remove rocks and debris.
Raised beds warm up faster in spring. They also drain better, which prevents root rot in Wisconsin’s clay soils.
Transplanting Seedlings
When your seedlings are 4–6 weeks old and have 4–5 true leaves, they’re ready to transplant.
- Water the seedlings thoroughly an hour before transplanting.
- Dig holes 12–18 inches apart, depending on variety. Space rows 24–36 inches apart.
- Add a handful of compost to each hole.
- Place the seedling in the hole so the lowest leaves are at soil level.
- Firm the soil around the roots and water well.
- Apply a starter fertilizer high in phosphorus to encourage root growth.
Water deeply after transplanting. Keep the soil consistently moist for the first week.
Direct Sowing Seeds
Direct sowing is simpler but requires careful timing. Here’s how:
- Sow seeds ¼ to ½ inch deep.
- Space seeds 3–4 inches apart in rows.
- Cover lightly with soil and water gently.
- Thin seedlings to 12–18 inches apart when they have 3–4 leaves.
- Keep the soil moist until germination, which takes 5–10 days.
Direct sowing works best for fall cabbage. The soil is warmer, so germination is faster.
Caring For Cabbage After Planting
Once your cabbage is in the ground, consistent care ensures good heads.
Watering
Cabbage needs 1–1.5 inches of water per week. Inconsistent watering causes heads to crack or bolt.
- Water deeply once or twice a week, not shallowly every day.
- Use drip irrigation or soaker hoses to keep leaves dry. Wet leaves invite disease.
- Mulch around plants with straw or grass clippings to retain moisture.
During dry spells in Wisconsin summers, increase watering. Cabbage is 92% water and wilts quickly.
Fertilizing
Cabbage is a heavy feeder. It needs regular nitrogen for leaf growth.
- Side-dress with compost or a balanced fertilizer 3–4 weeks after transplanting.
- Apply a nitrogen-rich fertilizer like blood meal or fish emulsion every 2–3 weeks.
- Stop fertilizing once heads begin to form. Too much nitrogen causes loose heads.
Yellowing lower leaves often indicate nitrogen deficiency. Address it quickly.
Pest And Disease Management
Wisconsin cabbage faces several pests. Here are common ones and how to handle them.
- Cabbage worms: Small green caterpillars that eat leaves. Use row covers or spray with Bt (Bacillus thuringiensis).
- Aphids: Tiny insects that suck sap. Blast them off with water or use insecticidal soap.
- Flea beetles: Small jumping beetles that make holes in leaves. Use diatomaceous earth or row covers.
- Club root: A soil-borne disease that causes swollen roots. Rotate crops and maintain soil pH above 6.5.
Rotate cabbage family crops (broccoli, kale, cauliflower) every 3–4 years. This prevents disease buildup in the soil.
Harvesting At The Right Time
Knowing when to harvest is as important as planting at the best time to plant cabbage in wisconsin. Harvest timing affects flavor and storage life.
Signs Of Readiness
Cabbage heads are ready when they feel firm and solid. The head should be dense when squeezed gently.
- Spring cabbage: Harvest when heads are 4–8 inches in diameter, depending on variety.
- Fall cabbage: Wait until heads are fully formed but before a hard freeze.
- Check the variety’s days to maturity on the seed packet.
Don’t wait too long. Over-mature heads split open, especially after heavy rain.
How To Harvest
Use a sharp knife to cut the head at the base. Leave a few outer leaves attached for protection.
- Cut the stem about 1 inch below the head.
- Remove any damaged or yellowing outer leaves.
- Rinse the head if dirty, then dry thoroughly.
- Store in the refrigerator in a plastic bag for up to 2 weeks.
For fall cabbage, leave the root in the ground. Some gardeners get a second crop of small side shoots after harvesting the main head.
Frequently Asked Questions
Can I plant cabbage in Wisconsin in August?
Yes, but only for a fall harvest. Plant by early August in southern Wisconsin and mid-July in northern areas. Choose fast-maturing varieties (60–70 days) to beat the frost.
What happens if I plant cabbage too early in Wisconsin?
Planting too early exposes seedlings to hard freezes. Cabbage can survive light frosts, but prolonged cold below 25°F damages the growing point. Plants may bolt (go to seed) instead of forming heads.
Should I start cabbage indoors or direct sow in Wisconsin?
For spring planting, start indoors for better control. For fall planting, direct sow is easier because the soil is warm. Indoor starts give you a 4–6 week head start on the growing season.
How do I protect cabbage from late frosts?
Use row covers, cloches, or frost blankets. Water the soil well before a frost; wet soil holds heat. Remove covers during the day if temperatures rise above 50°F.
Can I grow cabbage in containers in Wisconsin?
Yes, but choose compact varieties like ‘Baby Head’ or ‘Dwarf Morden’. Use a 5-gallon pot with drainage holes. Place in full sun and water daily in hot weather. Container cabbage may need more frequent fertilizing.
Final Tips For Wisconsin Cabbage Growers
Wisconsin’s climate is ideal for cabbage if you time it right. The cool springs and falls produce crisp, sweet heads that store well.
Keep a garden journal each year. Note your planting dates, frost dates, and harvest results. Over time, you’ll fine-tune the best time to plant cabbage in wisconsin for your specific location.
Don’t be afraid to experiment with different varieties. Some gardeners prefer savoy cabbage for its crinkled leaves. Others like red cabbage for its color and storage ability. Try a few and see what works in your garden.
Remember that cabbage is a heavy feeder. Prepare your soil well and fertilize regularly. With proper timing and care, you’ll enjoy homegrown cabbage from late spring through fall.
Wisconsin’s growing season is short but productive. By planting at the right time, you can harvest cabbage twice a year. Spring cabbage gives you early greens, while fall cabbage stores for winter meals.
Start planning now. Check your frost dates, order seeds, and prepare your garden bed. Your future self will thank you when you’re pulling fresh cabbage heads from the garden in May and October.