Growing Collard Greens in Zone 3b
Zone 3b has harsh winters and a short growing season. Start Collard Greens early indoors to maximize your harvest window. Last frost: May 15. First frost: Sep 22.
Planting Calendar
Season: May 15 – Sep 22 (130 days)
When to Plant Collard Greens in Zone 3b
Start Seeds Indoors: Apr 3
Start Collard Greens seeds indoors around Apr 3 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.
Transplant Outdoors: Apr 24
Transplant Collard Greens seedlings outdoors after Apr 24. Wait until soil temperature reaches 45°F. Space plants at 18/sqft. Harden off plants for a week before moving outside.
Harvest: Jun 13
First harvest approximately Jun 13 (~50 days from transplant). Continue harvesting until first frost (Sep 22). Collard Greens can overwinter in mild climates for continued harvest.
Fall Planting: Jul 14
For a fall harvest, plant Collard Greens around Jul 14 (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 3b?
Start Collard Greens seeds indoors around Apr 3. Transplant outdoors after Apr 24. Expect first harvest around Jun 13.
What is the last frost date for Zone 3b?
The average last spring frost date for Zone 3b is May 15. The first fall frost averages Sep 22, giving a 130-day growing season.
Can I grow Collard Greens in Zone 3b?
Yes. Collard Greens needs 60 days to harvest. Zone 3b has a 130-day growing season, which is sufficient.
What is the best month to plant Collard Greens in Zone 3b?
The best time to start Collard Greens in Zone 3b is Apr. Begin seeds indoors around Apr 3, then transplant outdoors after the last frost date of May 15.
How long does Collard Greens take to harvest?
Collard Greens takes approximately 60 days from planting to harvest. In Zone 3b, expect your first harvest around Jun 13.
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