When to Plant Kohlrabi in Rhode Island (2026 Guide)
Kohlrabi is an intriguing and unusual member of the brassica family, thriving in the cool weather that Rhode Island offers in spring and fall. With the median last spring frost date in Providence falling on April 20, gardeners can take advantage of the early spring to ensure a successful kohlrabi harvest. This versatile vegetable, known for its crisp texture and unique flavor, can be a delightful addition to your home garden, both for salads and cooked dishes.
For Rhode Island gardeners, the planting season is a critical period that requires careful timing. With a frost-free season that lasts about 185 days in Zone 6a, you have ample opportunities to grow kohlrabi, especially if you take care to manage your planting dates around the last spring frost. Whether you're a seasoned gardener or a beginner, understanding the right timing and care for kohlrabi can lead to a bountiful harvest.
Kohlrabi is particularly forgiving when it comes to temperature fluctuations, making it a great choice for interplanting with other crops. Its ability to establish quick growth, combined with its frost tolerance, means you can enjoy multiple harvests in a single growing season. As the first fall frost approaches on October 22, you will want to plan your harvest accordingly to enjoy kohlrabi at its best.
Planting Schedule by USDA Zone in Rhode Island
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6a | Start indoors February 15 – March 1, ~6–8 weeks before April 20 | Transplant outdoors April 10 – April 20, after last frost | Direct sow outdoors April 20 – May 1, after last frost | Harvest June 1 – June 22, 45–60 days after transplanting |
| Zone 5b | Start indoors March 1 – March 15, ~6–8 weeks before May 5 | Transplant outdoors April 25 – May 5, after last frost | Direct sow outdoors May 5 – May 15, after last frost | Harvest July 1 – July 25, 45–60 days after transplanting |
Kohlrabi Planting Windows in Rhode Island
- Indoor start: Start kohlrabi indoors around February 15 – March 1 in Rhode Island.
- Transplant outdoors: Transplant kohlrabi outdoors from April 10 – April 20 to ensure a successful growth.
- Harvest: You can expect to harvest kohlrabi from June 1 – June 22 for the best flavor and texture.
Common Mistakes Growing Kohlrabi in Rhode Island
- One common mistake in Rhode Island is planting kohlrabi too early. It's crucial to respect the last frost dates, especially in Zone 5b, where late spring frosts can damage young seedlings.
- Many gardeners overlook the need for proper soil drainage in Rhode Island, which can lead to root rot in kohlrabi. Ensure you amend your soil accordingly to support healthy growth, especially with the region's occasional heavy rains.
- Another mistake is neglecting to thin seedlings once they sprout. Crowded plants can lead to poor growth and missed harvests, so make sure to thin them to allow ample space for each plant.
- In Rhode Island, bad timing can occur if gardeners plant kohlrabi when summer heat begins. This can lead to tough, woody bulbs. Monitor temperatures and timing carefully to avoid this issue.
- Finally, many gardeners incorrectly assume that kohlrabi can survive any conditions. It's essential to manage heat and humidity levels in Rhode Island, as high humidity can cause fungal diseases in brassicas.
Frequently Asked Questions
What if I'm in a cold pocket of Rhode Island?
If you're in a colder microclimate, consider starting your kohlrabi indoors a bit earlier. Monitor local frost dates closely and be prepared to adjust your planting schedule based on your specific conditions.
Can I still plant kohlrabi in May?
While you can direct sow kohlrabi in May, it may affect grown quality. The optimal time for planting remains around late April after the last frost date to ensure ideal conditions for growth.
How do I know when to harvest my kohlrabi?
Harvest kohlrabi when bulbs reach about 3 inches in diameter for the best flavor and texture. Waiting too long can result in a woody texture, so check regularly as your harvest window approaches.
Can I grow kohlrabi year-round in Rhode Island?
Kohlrabi typically thrives only in the cooler months. While you can plant for a early spring and late summer harvest, extreme winter conditions in Rhode Island usually limit year-round growth without proper protection.
Are there specific soil requirements for growing kohlrabi?
Kohlrabi prefers well-draining soil enriched with organic matter. Conduct a soil test if you haven't recently, as its health is crucial for preventing diseases that can occur in the humid Rhode Island climate.
Keep Learning
City guides in Rhode Island
Other crops in Rhode Island
Typical fall sowing window for Kohlrabi in Rhode Island: August 14 – September 4.