Growing Napa Cabbage in Zone 5b
Zone 5b has cold winters and a moderate growing season. Timing is key for Napa Cabbage in this zone. Last frost: Apr 28. First frost: Oct 8.
Planting Calendar
Season: Apr 28 – Oct 8 (163 days)
When to Plant Napa Cabbage in Zone 5b
Start Seeds Indoors: Mar 17
Start Napa Cabbage seeds indoors around Mar 17 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.
Transplant Outdoors: Apr 7
Transplant Napa Cabbage seedlings outdoors after Apr 7. Wait until soil temperature reaches 45°F. Space plants at 12/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 11
First harvest approximately Jun 11 (~65 days from transplant). Continue harvesting until first frost (Oct 8).
Fall Planting: Jul 16
For a fall harvest, plant Napa Cabbage around Jul 16 (12 weeks before first frost).
Napa Cabbage in Other Zones
1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13bFrequently Asked Questions
When should I plant Napa Cabbage in Zone 5b?
Start Napa Cabbage seeds indoors around Mar 17. Transplant outdoors after Apr 7. Expect first harvest around Jun 11.
What is the last frost date for Zone 5b?
The average last spring frost date for Zone 5b is Apr 28. The first fall frost averages Oct 8, giving a 163-day growing season.
Can I grow Napa Cabbage in Zone 5b?
Yes. Napa Cabbage needs 70 days to harvest. Zone 5b has a 163-day growing season, which is sufficient.
What is the best month to plant Napa Cabbage in Zone 5b?
The best time to start Napa Cabbage in Zone 5b is Mar. Begin seeds indoors around Mar 17, then transplant outdoors after the last frost date of Apr 28.
How long does Napa Cabbage take to harvest?
Napa Cabbage takes approximately 70 days from planting to harvest. In Zone 5b, expect your first harvest around Jun 11.
Plan Your Napa Cabbage Garden
Track Napa Cabbage from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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