Growing Napa Cabbage in Zone 4a
Zone 4a has cold winters and a moderate growing season. Timing is key for Napa Cabbage in this zone. Last frost: May 5. First frost: Oct 1.
Planting Calendar
Season: May 5 – Oct 1 (149 days)
When to Plant Napa Cabbage in Zone 4a
Start Seeds Indoors: Mar 24
Start Napa Cabbage seeds indoors around Mar 24 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.
Transplant Outdoors: Apr 14
Transplant Napa Cabbage seedlings outdoors after Apr 14. Wait until soil temperature reaches 45°F. Space plants at 12/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 18
First harvest approximately Jun 18 (~65 days from transplant). Continue harvesting until first frost (Oct 1).
Fall Planting: Jul 9
For a fall harvest, plant Napa Cabbage around Jul 9 (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 4a?
Start Napa Cabbage seeds indoors around Mar 24. Transplant outdoors after Apr 14. Expect first harvest around Jun 18.
What is the last frost date for Zone 4a?
The average last spring frost date for Zone 4a is May 5. The first fall frost averages Oct 1, giving a 149-day growing season.
Can I grow Napa Cabbage in Zone 4a?
Yes. Napa Cabbage needs 70 days to harvest. Zone 4a has a 149-day growing season, which is sufficient.
What is the best month to plant Napa Cabbage in Zone 4a?
The best time to start Napa Cabbage in Zone 4a is Mar. Begin seeds indoors around Mar 24, then transplant outdoors after the last frost date of May 5.
How long does Napa Cabbage take to harvest?
Napa Cabbage takes approximately 70 days from planting to harvest. In Zone 4a, expect your first harvest around Jun 18.
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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