When to Plant Kohlrabi in New York (2026 Guide)

Kohlrabi is a delightful vegetable that can thrive in various conditions, making it a great choice for New York gardeners. This unusual brassica produces a swollen, bulb-like stem that is not only visually striking but also packed with flavor and nutrition. Recognizing the optimal planting times is key to enjoying a bountiful harvest of this versatile veggie, so let's dive in.

Depending on where you are in New York, your planting dates will vary significantly. In areas like Astoria and Baldwin, the last spring frost typically occurs around April 1, allowing for an early start in the garden. In contrast, places further north, like Albany and Amsterdam, have a later last frost date of May 5, which means a different approach to planting schedules is necessary.

As a cool-season crop, kohlrabi can be planted both in spring and again in late summer for a fall harvest. With a relatively short maturity time of 45 to 60 days from transplant, gardeners can expect to enjoy their fresh kohlrabi without much wait. Proper timing and care will lead to delicious yields that can be utilized in a variety of dishes.

Planting Schedule by USDA Zone in New York

Zone	Indoor start	Transplant out	Direct sow	Harvest
Zone 7a	Start seeds indoors February 15 – March 1, ~6–8 weeks before April 1	Transplant outdoors April 15 – April 30, after the last frost	Direct sow outdoors April 15 – May 1	Harvest from May 30 – July 1
Zone 5b	Start seeds indoors March 1 – March 15, ~6–8 weeks before May 5	Transplant outdoors May 15 – May 30, after the last frost	Direct sow outdoors May 15 – June 1	Harvest from July 1 – August 15
Zone 6b	Start seeds indoors February 25 – March 11, ~6–8 weeks before April 11	Transplant outdoors April 25 – May 10, after the last frost	Direct sow outdoors April 25 – May 15	Harvest from June 15 – July 30

Kohlrabi Planting Windows in New York

Indoor start: In New York, kohlrabi seeds should be started indoors between February 15 and March 15, depending on the zone.
Transplant outdoors: You can transplant kohlrabi outdoors between April 15 and May 30, based on your local frost dates.
Harvest: Kohlrabi in New York is typically ready for harvest from May 30 until August 15, varying by planting date and zone.

Common Mistakes Growing Kohlrabi in New York

One common mistake in New York is assuming that the growing climate is the same throughout the state. The diverse hardiness zones can significantly affect planting times and crop viability, leading to disappointing results if not considered.
Overwatering is another frequent error for New York gardeners. Kohlrabi doesn't require excessive moisture, so gardeners often end up with waterlogged soil that can cause roots to rot, especially in the humid summer months.
Fertilizing too late in the season can also be detrimental. New York's cooler fall nights can hinder plant metabolism, so avoid applying fertilizers in late summer to ensure the plants focus energy on root and bulb development rather than leaf growth.
Many gardeners in New York underestimate the impact of late spring frosts. Even in warmer zones, such as Zone 7a, a sudden chill can damage young kohlrabi plants, so it's vital to wait until all danger of frost has passed before transplanting outdoors.
Choosing the wrong kohlrabi variety can impact yields. For instance, purple varieties are advantageous in warmer climates but can be more susceptible to pests; thus, knowing your local conditions is key to choosing the right type.

Frequently Asked Questions

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

Gardeners in cold pockets should consider starting kohlrabi indoors earlier than usual. This ensures seedlings have a sufficient growing period before being transplanted outdoors after the last frost.

Can I still plant kohlrabi in May?

Yes, you can plant kohlrabi in early May, but be aware of the local frost dates. Ensure your seedlings have acclimatized by the time they are transplanted to avoid the risk of frost damage.

How can I tell when kohlrabi is ready to harvest?

Monitor the size of the bulbs; they should reach about 3 inches in diameter for the best flavor and texture. If they grow larger than this, they can become tough and woody.

Can I grow kohlrabi in containers?

Absolutely! Kohlrabi can thrive in containers as long as they are deep enough to accommodate its root system. Choose a container that is at least 12 inches deep and provide sufficient sunlight.

What's the best way to prepare kohlrabi?

Kohlrabi can be enjoyed raw, roasted, or braised. For raw eating, peel the skin and slice thinly. It adds a delicious crunch to salads and slaws, showcasing its mild flavor beautifully.

Keep Learning

Typical fall sowing window for Kohlrabi in New York: September 7 – September 28.