When to Plant Brussels Sprout in Unknown
Start Seeds Indoors
Tuesday, November 18, 2025
Transplant outdoors: Tuesday, February 10, 2026
State
Unknown
USDA Zones
5a, 7a, 7b, 8b, 9a, 9b
Avg Last Frost
Tuesday, February 10, 2026
Cities Covered
13
Unknown Planting Schedule by Zone
Unknown spans 6 zones — find yours below for the most accurate dates.
| Zone | Last Frost | Start Indoors | Transplant |
|---|---|---|---|
| 5a | Sunday, May 10, 2026 | Sunday, February 15, 2026 | Sunday, May 10, 2026 |
| 7a | Friday, April 10, 2026 | Friday, January 16, 2026 | Friday, April 10, 2026 |
| 7b | Sunday, April 5, 2026 | Sunday, January 11, 2026 | Sunday, April 5, 2026 |
| 8b | Sunday, March 15, 2026 | Sunday, December 21, 2025 | Sunday, March 15, 2026 |
| 9a | Friday, February 20, 2026 | Friday, November 28, 2025 | Friday, February 20, 2026 |
| 9b | Tuesday, February 10, 2026 | Tuesday, November 18, 2025 | Tuesday, February 10, 2026 |
Dates based on average last frost. Check your local forecast before planting.
🌿 About Brussels Sprout
Growing Brussels Sprout in Unknown: Complete Guide
Brussels Sprout (Brassica oleracea var. gemmifera) is a warm-season crop that needs a head start indoors before Unknown's last frost. Most Unknown gardeners begin seeds indoors around Tuesday, November 18, 2025 and move transplants outside around Tuesday, February 10, 2026, after the risk of frost has passed.
Because Unknown stretches across 6 USDA hardiness zones (5a, 7a, 7b, 8b, 9a, 9b), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.
With 84 days to maturity, Brussels Sprout needs the indoor head start that Unknown's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.
Brussels Sprout requires full sun and regular moisture. Most of Unknown receives adequate sunlight during the growing season, though gardeners in humid eastern regions should watch for fungal issues and ensure good air circulation.
For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Unknown.
Frequently Asked Questions
When should I plant Brussels Sprout in Unknown?
In Unknown, start Brussels Sprout seeds indoors around Tuesday, November 18, 2025 and transplant outdoors around Tuesday, February 10, 2026 after your last frost. Unknown spans zones 5a–9b, so dates shift by 1–4 weeks depending on where you live.
What is the last frost date in Unknown?
Unknown spans 6 USDA zones (5a, 7a, 7b, 8b, 9a, 9b), so last frost dates vary by region. ZIP 50099 (5a) sees frost until around Sunday, May 10, 2026, while ZIP 32143, ZIP 85117, ZIP 85127 (9b) is frost-free much earlier.
How long does Brussels Sprout take to grow in Unknown?
Brussels Sprout takes about 84 days from transplant (or direct sow) to harvest. Starting seeds indoors in Unknown gives you a head start so plants are ready to go out after the last frost.
What USDA zones does Unknown cover for Brussels Sprout?
Unknown includes zones 5a, 7a, 7b, 8b, 9a, 9b. Brussels Sprout grows well across all of these zones with adjusted timing — use the zone table above to find the right dates for your part of the state.
Find Precise Dates for Your City
Select a city for exact planting dates based on local frost records.