🥦When to Plant Cauliflower in USDA Zone 7a (2026 Guide)
Fussier brassica that wants steady cool weather. Transplant early. Here is the cool-season planting schedule for cauliflower in zone 7a (covering areas like Nashville TN, Oklahoma City OK). All dates are based on 2026 frost data for your zone.
Start Seeds Indoors
Feb 27
Transplant
Mar 27
Harvest From
Jun 10
Because cauliflower is a cool-season crop, it tolerates light frost and can go out around Mar 27, before zone 7a's average last frost on Apr 10.
- Type: Cool-season
- Method: Transplant
- Days to harvest: 75
- Spacing: 18" apart
- Sun: Full sun
- Zone 7a frost: Apr 10 – Oct 25
- Season length: ~198 days
- Companions: beans, onion, celery
Growing cauliflower in zone 7a
Zone 7a has an average last spring frost around Apr 10 and a first fall frost around Oct 25, giving roughly 198 frost-free growing days. That window comfortably fits cauliflower's 75-day cycle, with room for a second succession planting if you time it right.
Get a head start by sowing seeds indoors around Feb 27, roughly 6 weeks before your last frost. Move the seedlings outside around Mar 27. Give each plant about 18 inches of space in full sun.
Zone 7a specific growing notes
In zone 7a (Nashville TN, Oklahoma City OK), your 198-day growing season means cauliflower should be one of your first spring plantings. Cool-season crops thrive in the mild part of your growing window. Monitor soil temperature — cauliflower germinates best when soil is 40-75°F.
Your first fall frost around Oct 25 means your last possible harvest is roughly late Oct. For a continuous supply, consider succession planting every 2-3 weeks from Mar 27 through mid-season.
Pro tip for cauliflower
Blanch heads by gathering outer leaves and tying them loosely over the developing curd with string or a rubber band when it reaches 2-3 inches across. This keeps the curd snowy white and prevents bitterness.
Troubleshooting cauliflower
Buttoning—forming tiny, unusable heads prematurely—is caused by temperature swings, drought stress, or root-bound seedlings. Transplant on time (not late), keep soil consistently moist, and choose stress-tolerant varieties.
Growing cauliflower in containers
One plant per 5-gallon pot, but cauliflower is the most challenging brassica for containers. It demands perfectly steady cool temperatures, no check in growth, and consistent moisture from transplant to harvest.
Can you plant cauliflower twice a year?
Yes—and fall cauliflower often outperforms spring-planted. Start seeds indoors in early July in zones 5+ and transplant by early August. Heads mature in September-October cooling weather with fewer pest issues.
Frequently asked questions
When should I plant cauliflower in zone 7a?
Transplant around Mar 27. If starting from seed indoors, sow around Feb 27. Because cauliflower is a cool-season crop, it tolerates light frost and can go out around Mar 27, before zone 7a's average last frost on Apr 10.
How long does cauliflower take to grow in zone 7a?
About 75 days from transplanting to first harvest. A Mar 27 planting in zone 7a is typically ready to pick from around Jun 10. Zone 7a has about 198 frost-free days — plenty of time for a second succession planting.
How far apart should I space cauliflower?
Space cauliflower about 18 inches apart in full sun. This gives each plant enough room for roots to spread and leaves to catch sunlight without competing.
What is the best tip for growing cauliflower?
Blanch heads by gathering outer leaves and tying them loosely over the developing curd with string or a rubber band when it reaches 2-3 inches across. This keeps the curd snowy white and prevents bitterness.
What are common problems with cauliflower and how do I fix them?
Buttoning—forming tiny, unusable heads prematurely—is caused by temperature swings, drought stress, or root-bound seedlings. Transplant on time (not late), keep soil consistently moist, and choose stress-tolerant varieties.
Can I grow cauliflower in a container?
One plant per 5-gallon pot, but cauliflower is the most challenging brassica for containers. It demands perfectly steady cool temperatures, no check in growth, and consistent moisture from transplant to harvest.
Can I plant a second crop of cauliflower for fall harvest?
Yes—and fall cauliflower often outperforms spring-planted. Start seeds indoors in early July in zones 5+ and transplant by early August. Heads mature in September-October cooling weather with fewer pest issues.
What grows well next to cauliflower?
Good companion plants for cauliflower are beans, onion, celery. Avoid planting near warm-season crops that compete for space and nutrients. Cauliflower also benefits from crop rotation — do not plant it in the same spot year after year.