📍 Cable, WI · Zone 4a · Last frost Friday, May 15, 2026
✏️ ChangeWhen to Plant Napa Cabbage in Cable, Wisconsin (54821)
Location
Cable, Wisconsin
ZIP Code
54821
USDA Zone
4a
Last Frost
Friday, May 15, 2026
📅 Your 2026 Planting Dates
Start Seeds Indoors
Friday, April 3, 2026
Transplant Outdoors
Friday, May 29, 2026
Based on last frost Friday, May 15, 2026 · Zone 4a
Pro tip: Start Napa Cabbage seeds indoors 6 weeks before your last frost date, then transplant outdoors around Friday, May 29, 2026.
🌿 Plant Details
☀️ Growing Requirements
☀️
Sun
Full Sun (6-8 hours)
💧
Water
Regular (1-2 inches/week)
↔️
Spacing
18" apart
🌱
Planting Depth
0.25" deep
Seeds typically germinate in 4-7 days
Ready to Plant Napa Cabbage in Cable?
Get your seeds now so they're ready by Friday, April 3, 2026.
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🤝 Good Companions
⚠️ Avoid Planting Near
Full Companion Planting Guide for Napa Cabbage
See which plants help Napa Cabbage thrive, which to keep away, and raised bed layout tips →
🛠️ Supplies You'll Need
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🌾 Seed Saving Guide
🟡 ModerateWhen to Harvest Seed
Allow heads to bolt in spring heat. Harvest seed pods when tan and dry.
Processing
Thresh dried seed stalks, winnow to separate seeds.
Seed Viability
Up to 4 years when stored cool, dark, and dry.
Pro Tip
Brassica rapa — crosses with bok choy, turnip, and other rapa crops. Isolate by 300 feet.
Raised Bed Planting Guides
A 4×8 bed fits 14 plants of Napa Cabbage. See plant counts, spacing grids, and companion pairings for every bed size →
Frequently Asked Questions
When should I plant Napa Cabbage in Cable, Wisconsin? +
In Cable (Zone 4a), start Napa Cabbage seeds indoors around Friday, April 3, 2026 and transplant outdoors around Friday, May 29, 2026.
What is the last frost date for Cable, Wisconsin? +
The average last spring frost date for Cable, Wisconsin (ZIP 54821) is around Friday, May 15, 2026. This is based on NOAA climate normals for USDA Zone 4a.
How long does Napa Cabbage take to grow? +
Napa Cabbage typically matures in about 70 days from transplanting. In Cable, that means you can expect harvest around Friday, May 29, 2026 plus 70 days.
Should I start Napa Cabbage indoors or direct sow in Wisconsin? +
Napa Cabbage should be started indoors 6 weeks before your last frost date. In Cable, that means starting around Friday, April 3, 2026.
📚 More Napa Cabbage Planting Guides
Other Plants for Cable
Growing Napa Cabbage in Zone 4a
Napa Cabbage (Brassica rapa subsp. pekinensis) is a popular garden vegetable. In Cable, Wisconsin, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, April 3, 2026.
Your average last frost date is Friday, May 15, 2026. Plan to transplant your Napa Cabbage seedlings outdoors around Friday, May 29, 2026, about 2 weeks after your last frost date.