When to Plant Kohlrabi in Kentucky (2026 Guide)
Kohlrabi is an oddly charming member of the brassica family that is both easy to grow and delicious to eat. Its bulbous stem, crisp texture, and mild sweetness make it a delightful addition to slaws, salads, and cooked dishes alike. If you're considering adding kohlrabi to your garden in Kentucky, understanding the local climate and frost dates is crucial for a successful harvest.
In Kentucky, where the growing season varies between zones, each area presents unique challenges and opportunities for growing kohlrabi. For instance, if you're gardening in Zone 6a, you can expect your last spring frost around April 20, while those in Zone 6b will see it as early as April 13. Knowing these dates helps determine when to start your seeds indoors or transplant them outdoors.
Kohlrabi thrives in cool weather, making it suitable for both spring and fall planting. With a frost-free season of approximately 180 days in Zone 6a and 195 days in Zone 6b, you’ll have ample time to grow this nutritious vegetable. Generally, kohlrabi reaches maturity within 45 to 60 days, so careful scheduling around the frost dates is key to achieving the best flavor and texture.
Planting Schedule by USDA Zone in Kentucky
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start seeds indoors from February 25 – March 6, ~6 weeks before April 20 | Transplant outdoors from April 21 – May 5, after the last spring frost | Direct sow outdoors from May 15 – June 10 for fall harvest | Harvest from June 30 – July 15 |
| Zone 6b | Start seeds indoors from February 18 – March 1, ~6 weeks before April 13 | Transplant outdoors from April 14 – April 28, after the last spring frost | Direct sow outdoors from May 25 – June 15 for fall harvest | Harvest from July 10 – July 25 |
Kohlrabi Planting Windows in Kentucky
- Indoor start: For indoor starting, begin seeds for kohlrabi between February 18 and March 6 based on your zone.
- Transplant outdoors: Transplant your kohlrabi outdoors from April 14 to May 5, ensuring it is past the last frost date.
- Harvest: You can expect to harvest your kohlrabi from late June to late July, depending on your planting dates.
Common Mistakes Growing Kohlrabi in Kentucky
- One common mistake is planting kohlrabi too late in the spring. In Kentucky's warm climate, this can lead to bolting, making the bulbs less tasty and tender.
- Underestimating humidity levels in Kentucky can also hurt your kohlrabi. High humidity can promote fungal diseases, so consider spacing plants properly and using good airflow to combat this issue.
- Many gardeners in Kentucky overlook the importance of soil pH for kohlrabi. It thrives best in slightly acidic to neutral soil (pH 6.0 to 7.0), so testing and amending the soil is essential.
- Another frequent error is neglecting to harvest at the right time. Waiting too long may result in overly large kohlrabi bulbs that could become woody in texture, diminishing their quality.
- Lastly, planting kohlrabi in dense patches without considering its growth needs can lead to stunted plants. Make sure to follow recommended spacing guidelines to allow room for growth.
Frequently Asked Questions
What if I'm in a cold pocket of Kentucky?
If you're in a colder area, such as a valley, consider starting your kohlrabi indoors earlier to ensure they have enough time to grow. Planting in raised beds can also help with soil temperature.
Can I still plant kohlrabi in May?
You can plant kohlrabi in May if you're in Zone 6a or 6b, but aim for direct sowing rather than transplanting for optimal growth later in the season.
How can I tell if my kohlrabi is ready to harvest?
Kohlrabi is ready to harvest when the bulbs reach approximately 3 inches in diameter. Beyond this size, they can become woody and less enjoyable to eat.
Is it too late to direct sow kohlrabi in early June?
Sowing kohlrabi in early June is generally still feasible for fall crops. Just ensure you choose a variety that matures quickly, ideally around 45 days.
Can kohlrabi survive a light frost?
Yes, kohlrabi is quite frost-tolerant, which makes it a suitable crop for early spring and autumn gardens. However, it’s best to protect young seedlings from heavy frost by using row covers.
Keep Learning
City guides in Kentucky
Other crops in Kentucky
Typical fall sowing window for Kohlrabi in Kentucky: August 14 – September 4.