When to Plant Kohlrabi in Ohio (2026 Guide)
Kohlrabi is an intriguing vegetable that is both delicious and easy to grow, making it a wonderful addition to Ohio gardens. With its bulb-like swollen stem and crisp texture, kohlrabi can be enjoyed raw, roasted, or braised. Understanding when to plant this unique brassica in different regions of Ohio is crucial for successful harvests. Given the state's varying frost dates, planning your planting and harvesting around these dates is essential for maximizing your yield.
In Ohio, you will find various USDA hardiness zones, from Zone 6a, with a median last spring frost on April 26, to Zone 5b, with a later last frost around May 4. Such variations mean that when to start kohlrabi indoors or direct sow it outside will differ depending on your specific zone. Those in Zone 5a, for example, will need to be particularly vigilant with late spring frosts, as the median last frost date here falls on May 17.
Growing kohlrabi is also a wise choice for filling gaps in your crop rotation, enabling you to make the most of your garden space. Not only does kohlrabi tolerate some frost, but it matures quickly within 45 to 60 days from transplanting. If you're eager for fresh produce during Ohio's diverse growing seasons, learn the best practices for planting and harvesting kohlrabi to ensure a bountiful crop this year.
Planting Schedule by USDA Zone in Ohio
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start February 15 – March 1, ~6–8 weeks before April 26 | Transplant outdoors April 10 – April 25, ~1–2 weeks after April 26 | Direct sow outdoors April 10 – April 20, ~6 days before April 26 | Harvest from June 5 – July 15, ~45–60 days after transplanting |
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 4 | Transplant outdoors April 25 – May 1, ~20 days after May 4 | Direct sow outdoors April 25 – May 4, ~0–10 days after May 4 | Harvest from June 15 – July 25, ~45–60 days after transplanting |
| Zone 5a | Start March 15 – March 30, ~6–8 weeks before May 17 | Transplant outdoors May 8 – May 15, ~7–15 days after May 17 | Direct sow outdoors May 8 – May 17, ~0–10 days after May 17 | Harvest from June 25 – August 3, ~45–60 days after transplanting |
Kohlrabi Planting Windows in Ohio
- Indoor start: In Ohio, start kohlrabi indoors February 15 – March 30 depending on your hardiness zone.
- Transplant outdoors: Transplant kohlrabi outdoors between April 10 and May 15 based on your zone.
- Harvest: You can begin harvesting kohlrabi in Ohio from June 5 through August 3, depending on when you planted.
Common Mistakes Growing Kohlrabi in Ohio
- One common mistake in Ohio is waiting too long to transplant kohlrabi outdoors. Always check your specific frost date; for instance, in Zone 6a, planting should occur after April 26 to avoid damage.
- Another frequent error occurs when gardeners fail to provide enough spacing between kohlrabi plants. In Ohio’s humid climate, crowded plants are more prone to disease, impacting yield and quality.
- Many Ohio gardeners underestimate the importance of soil quality. Heavy clay or alkaline soil types can hinder kohlrabi growth. It's crucial to amend the soil properly before planting.
- Atypical late spring frosts, especially in northern Ohio, often catch gardeners off guard, leading to weakened or lost plants. It's wise to have covering materials handy just in case bad weather hits.
- Lastly, some growers do not adequately protect young kohlrabi from pests, especially in Ohio's slightly warmer months. Utilize row covers or organic solutions to keep pests at bay.
Frequently Asked Questions
What should I do if I’m in a cold pocket of Ohio?
If you're in a cooler area, be aware of your local frost dates. You may want to start your kohlrabi indoors to give them a head start before transplanting them outside when it warms up.
Can I still plant kohlrabi in May?
Yes, you can still plant kohlrabi in May, especially in the southern parts of Ohio where the risk of frost decreases. Just be mindful of transplant timings and ensure they have enough time to mature before the fall.
How can I tell when kohlrabi is ready to harvest?
Kohlrabi should be harvested when the bulb reaches approximately 3 inches in diameter for the best flavor and texture. Checking regularly as they approach maturity will help avoid the bulb becoming woody.
What if I experience late frosts after planting kohlrabi?
If you face late frosts, protect the seedlings with row covers or cloches to retain warmth and reduce frost damage. This is crucial for young plants that are still establishing.
Do kohlrabi leaves require any special preparation?
Kohlrabi leaves are edible and can be used in various dishes. They can be treated like kale; just wash them thoroughly and consider cooking them for a tasty addition to stir-fries or soups.
Keep Learning
City guides in Ohio
Other crops in Ohio
Typical fall sowing window for Kohlrabi in Ohio: August 9 – August 30.