Growing Collard Greens in Zone 4b
Zone 4b has cold winters and a moderate growing season. Timing is key for Collard Greens in this zone. Last frost: May 1. First frost: Oct 5.
Planting Calendar
Season: May 1 – Oct 5 (157 days)
When to Plant Collard Greens in Zone 4b
Start Seeds Indoors: Mar 20
Start Collard Greens seeds indoors around Mar 20 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.
Transplant Outdoors: Apr 10
Transplant Collard Greens seedlings outdoors after Apr 10. Wait until soil temperature reaches 45°F. Space plants at 18/sqft. Harden off plants for a week before moving outside.
Harvest: May 30
First harvest approximately May 30 (~50 days from transplant). Continue harvesting until first frost (Oct 5). Collard Greens can overwinter in mild climates for continued harvest.
Fall Planting: Jul 27
For a fall harvest, plant Collard Greens around Jul 27 (10 weeks before first frost).
Collard Greens 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 Collard Greens in Zone 4b?
Start Collard Greens seeds indoors around Mar 20. Transplant outdoors after Apr 10. Expect first harvest around May 30.
What is the last frost date for Zone 4b?
The average last spring frost date for Zone 4b is May 1. The first fall frost averages Oct 5, giving a 157-day growing season.
Can I grow Collard Greens in Zone 4b?
Yes. Collard Greens needs 60 days to harvest. Zone 4b has a 157-day growing season, which is sufficient.
What is the best month to plant Collard Greens in Zone 4b?
The best time to start Collard Greens in Zone 4b is Mar. Begin seeds indoors around Mar 20, then transplant outdoors after the last frost date of May 1.
How long does Collard Greens take to harvest?
Collard Greens takes approximately 60 days from planting to harvest. In Zone 4b, expect your first harvest around May 30.
Plan Your Collard Greens Garden
Track Collard Greens from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Collard Greens Growing Guide