When to Plant Kohlrabi in Utah (2026 Guide)
Kohlrabi is an often-overlooked brassica that offers a unique taste and texture, making it a delightful addition to Utah gardens. With a mild flavor reminiscent of broccoli stems, kohlrabi can be enjoyed raw in salads or slaws, as well as cooked in various dishes. Understanding when to plant kohlrabi based on the last frost dates is crucial for a successful harvest, especially in areas with varying climates like Utah.
The climate in Utah presents some gardening challenges due to its distinct frost dates across different zones. For instance, in Zone 6a, the average last spring frost falls on April 27, which allows for early planting opportunities. If you're in Zone 5b, you'll need to wait until May 11 to transplant your kohlrabi outdoors, so timing is key to ensuring a bountiful crop.
Kohlrabi's relatively quick growth cycle of 45–60 days makes it an appealing choice for both novice and experienced gardeners. Whether you're planting in Salt Lake City, Ogden, or another location in Utah, carefully planning your planting and harvesting windows can maximize your garden's potential. By following specific planting guidelines based on your hardiness zone, you can enjoy fresh kohlrabi throughout the growing season.
Planting Schedule by USDA Zone in Utah
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Start March 15 – March 29, ~6–8 weeks before May 11 | Transplant outdoors May 11 – May 25, after last frost | Direct sow May 11 – May 25, after last frost | Harvest from June 25 – July 10, 45–60 days after transplanting |
| Zone 6a | Start April 1 – April 15, ~6–8 weeks before April 27 | Transplant outdoors April 27 – May 11, after last frost | Direct sow April 27 – May 11, after last frost | Harvest from June 10 – June 25, 45–60 days after transplanting |
| Zone 5a | Start March 1 – March 15, ~6–8 weeks before May 19 | Transplant outdoors May 19 – June 2, after last frost | Direct sow May 19 – June 2, after last frost | Harvest from June 25 – July 10, 45–60 days after transplanting |
Kohlrabi Planting Windows in Utah
- Indoor start: Start kohlrabi indoors from March 1 – March 29, depending on your zone.
- Transplant outdoors: Transplant kohlrabi outdoors between April 27 and June 2, depending on your hardiness zone.
- Harvest: Harvest kohlrabi from June 10 to July 10, depending on when you planted.
Common Mistakes Growing Kohlrabi in Utah
- One common mistake is planting kohlrabi too late in Utah’s cooler zones, especially in areas like Cedar City. With the final spring frost occurring on May 19, it's crucial to transplant or direct sow promptly to ensure a successful crop.
- Overwatering is another issue that gardeners face in Utah, particularly with kohlrabi. This brassica prefers well-drained soil, and too much moisture can lead to root rot and other diseases, detrimental to your plants.
- Failing to thin seedlings can hinder growth and reduce yields. In Utah's varied climates, it's important to give each kohlrabi sufficient space to develop. A crowded planting can lead to smaller, less favorable bulbs.
- Ignoring pest control strategies can be a setback for kohlrabi growers. In Utah, the presence of pests like aphids and cabbage worms can significantly affect your plants, so keep an eye on pest levels and take preventive measures.
- Relying solely on folklore regarding companion planting can be misleading. While traditional pairings exist, it’s best to utilize scientific research to select the most compatible plants and ensure a successful garden in Utah.
Frequently Asked Questions
What if I'm in a cold pocket of Utah?
If you live in a particularly cold area, consider starting your kohlrabi indoors and using row covers. This will provide additional warmth and protect against late frosts, extending your growing season and improving success.
Can I still plant kohlrabi in May?
Yes, if you're in Zone 6a, you can transplant kohlrabi outdoors after April 27. If you're in Zone 5a, aim to transplant by May 19. Just ensure you track the local frost dates for your area.
Is kohlrabi suitable for container gardening in Utah?
Absolutely! Just make sure your containers are deep enough to allow the kohlrabi bulbs to develop properly. Choose a quality potting mix and place your containers where they’ll receive ample sunlight.
What can I do if my kohlrabi gets pests?
If you notice pests like aphids or cabbage worms, try organic solutions such as insecticidal soap or neem oil. Hand-picking larger pests can also help keep your kohlrabi healthy and thriving.
When should I harvest my kohlrabi?
You should harvest kohlrabi when the bulbs reach about 3 inches in diameter, ideally between June 25 and July 10. Larger bulbs can become fibrous and less pleasant to eat, so it's best to pick them at the perfect size.
Keep Learning
City guides in Utah
Other crops in Utah
Typical fall sowing window for Kohlrabi in Utah: August 10 – August 31.