When to Plant Cabbage in Idaho (2026 Guide)
Growing cabbage in Idaho can be a rewarding endeavor, especially for those who appreciate fresh, home-grown produce. With its cool-season growing preference, cabbage thrives in the climate found in various Idaho regions. Planning your planting dates around the last frost dates, such as May 6 in Boise and May 25 in Blackfoot, is essential for a successful harvest.
Cabbage is not only nutritious but also incredibly versatile, coming in an array of colors and varieties. It can be grown for a summer harvest or a fall harvest, depending on your planting strategy. In Idaho, understanding your zone's frost-free season—around 155 days in Zone 5b or about 116 days in Zone 5a—will help you select the right crops and plan your planting.
By taking into account specific frost dates, you can optimize your planting and harvesting schedule. In Boise and Caldwell, for example, you should plan to transplant your seedlings outdoors around late March to early April. With careful timing and attention to detail, you can enjoy an abundant cabbage harvest well into the fall, just as the cool weather starts to return.
Planting Schedule by USDA Zone in Idaho
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 5b | Start March 10 – March 24, ~6–8 weeks before May 6 | Transplant outdoors April 1 – April 15, after last frost | Direct sow April 15 – May 1, after last frost | Harvest by October 1 – October 8, before first frost |
| Zone 5a | Start April 1 – April 15, ~6–8 weeks before May 25 | Transplant outdoors May 1 – May 15, after last frost | Direct sow May 15 – June 1, after last frost | Harvest by September 10 – September 18, before first frost |
| Zone 4b | Start April 15 – April 30, ~6–8 weeks before June 12 | Transplant outdoors May 20 – June 5, after last frost | Direct sow June 1 – June 15, after last frost | Harvest by August 20 – September 5, before first frost |
Cabbage Planting Windows in Idaho
- Indoor start: Start cabbage indoors from March 10 to April 30, depending on your specific Idaho zone.
- Transplant outdoors: Transplant your cabbage outdoors from April 1 in Zone 5b until June 5 in Zone 4b.
- Harvest: Harvest cabbage starting as early as September 5 in Zone 4b through October 8 in Zone 5b.
Common Mistakes Growing Cabbage in Idaho
- One common mistake is to assume that Idaho's diverse climates mean you can plant cabbage at any time. Depending on your specific region within Idaho, frost dates can significantly impact your planting schedule.
- Some gardeners forget to account for the strong winds that can frequently occur in parts of Idaho. These winds can stress young cabbage plants, so provide windbreaks when necessary to protect your seedlings.
- A mistake many Idaho gardeners make is not checking their soil pH before planting cabbage. Acidic soil can increase the risk of clubroot disease, so it’s vital to test and amend your soil accordingly.
- Overwatering is another frequent issue, particularly in Idaho's wetter areas. Cabbage prefers consistent moisture, but too much can lead to root problems, stunted growth, and disease.
- In areas with late spring snow or frost, such as parts of Idaho, planting too early leads to surprising losses. Always keep local weather patterns in mind when planning your schedule.
Frequently Asked Questions
What if I'm in a cold pocket of Idaho?
In a cold pocket, your last frost date might be later, which can affect your cabbage planting schedule. Make sure to adjust your indoor starting and transplanting dates accordingly to avoid losing your seedlings to unexpected late frosts.
Can I still plant cabbage in May?
Yes, if you're in Zone 5a or 4b where the frost has passed, you can plant cabbage in May. Just ensure to select faster-maturing varieties to give them enough time to grow before fall frosts arrive.
How does soil type affect cabbage growth in Idaho?
Soil type greatly influences cabbage growth. Well-drained, loamy soil is best, while heavy clay or overly acidic soil can hinder growth and increase disease risk. Testing and improving soil quality is especially important in Idaho gardens.
What are the signs that my cabbage is ready to harvest?
Look for firm heads that feel solid when you gently squeeze them. The outer leaves should still be vibrant and healthy. Each variety has differing maturity days, so check the seed packet for specific timing to avoid early harvesting.
Can I grow cabbage in containers in Idaho?
Absolutely! Cabbage grows well in containers, allowing you to manage conditions more easily. Use a deep pot with good drainage, and ensure you're providing adequate water and nutrients for best results, especially in Idaho's variable climate.
Keep Learning
City guides in Idaho
Other crops in Idaho
Typical fall sowing window for Cabbage in Idaho: July 14 – August 4.