When to Plant Collard Greens in New Jersey (2026 Guide)

Growing collard greens in New Jersey is a rewarding endeavor, especially with their resilience to both heat and cold. In this state, collards thrive from early spring through late fall, allowing gardeners to enjoy fresh greens from their own backyards. The median last spring frost in many areas, such as Zone 6a, typically occurs around April 22, while Zone 7a gardeners can expect it a bit earlier on April 1.

As you prepare to plant collards, it’s crucial to understand your local climate. New Jersey's diverse zoning, with cities like Newark and Jersey City experiencing varying frost dates, influences planting times and strategies. Especially in areas like Zone 6b, where the last frost date is around April 11, planning your indoor starting and outdoor transplanting windows will set you up for a successful harvest.

Collard greens not only provide essential nutrients but also improve in flavor after a frost, making late-season plantings particularly rewarding. You can expect to harvest from these hardy plants into the fall, with the first fall frost occurring around October 20 in some zones, ensuring you can enjoy the bracing taste of freshly picked collards even as the season winds down.

Planting Schedule by USDA Zone in New Jersey

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 6a	Start February 15 – March 1, ~6–8 weeks before April 22	Transplant outdoors April 23 – May 7, ~1 week after last frost	Direct sow April 23 – May 21, after last frost has passed	Harvest from June 15 – December 1, before heavy frosts
Zone 7a	Start January 15 – January 30, ~8–10 weeks before April 1	Transplant outdoors April 2 – April 20, right after last frost	Direct sow April 2 – May 5, following last frost	Harvest from June 1 – November 15, possibly into winter with protection
Zone 6b	Start February 20 – March 8, ~6–8 weeks prior to April 11	Transplant outdoors April 12 – May 2, after last frost has passed	Direct sow April 12 – May 15, once frosts are over	Harvest from June 1 – November 28, utilizing frost protection if needed

Collard Greens Planting Windows in New Jersey

Indoor start: For New Jersey, start collard greens indoors from mid-February to early March to ensure strong seedlings.
Transplant outdoors: Transplant collard greens outdoors in New Jersey from late April through early May, adjusting for your local frost dates.
Harvest: Expect to harvest collard greens in New Jersey from early June through late November, with protection allowing for extended harvests.

Common Mistakes Growing Collard Greens in New Jersey

One common mistake in New Jersey is planting collards too early, especially in colder regions where late frosts can damage young plants. Always check your local frost dates and wait until the soil has warmed sufficiently.
Another mistake is overlooking the potential for aphid infestations, which can be common in New Jersey, especially in the spring and fall. Regular checks and maintenance are crucial to keep plants healthy.
Many gardeners assume collards thrive best with little care, but neglecting watering during dry spells common in New Jersey can lead to slow growth. Ensure consistent moisture, particularly during hot summer months.
New Jersey's humidity can promote diseases, particularly downy mildew. Be cautious of planting collards in overly shaded areas that retain moisture; instead, choose spots with good air circulation and sunlight.
Some New Jersey gardeners plant collards near shorter crops without considering shading. This can reduce yields; instead, plant collards in locations where they won’t overshadow their companion plants.

Frequently Asked Questions

Can I plant collard greens in May?

Yes, you can plant collard greens in May in New Jersey, especially in Zone 6a or 6b. Just ensure you plant them after the last frost date to avoid damage.

What if I'm in a cold pocket of New Jersey?

If you're in a colder pocket, consider starting collards indoors earlier and transplanting them once the danger of frost has passed. Always monitor local conditions.

How should I care for collards during summer heat?

During hot spells, ensure collards receive enough water, and consider partial shade to prevent stress. Consistent moisture will help maintain leaf tenderness and minimize bitterness.

When is the best time to start harvesting collards?

The best time to start harvesting collards is when the outer leaves reach 10-12 inches long. This ensures optimal flavor without making them tough and fibrous.

Can collards survive light frosts?

Yes, collards are quite resilient and can survive light frosts, which actually enhances their flavor. Use row covers for additional protection if prolonged cold is expected.

Keep Learning

Typical fall sowing window for Collard Greens in New Jersey: August 9 – August 30.