When to plant brussels sprouts in USDA Zone 6b

Plan your brussels sprouts planting around local frost risk and soil temperature, then work backward from the harvest week your buyers need. The calendar below is a starting point, not a field-level weather forecast.

Boone NC, northern VA, central KY, southern IN. Average last spring frost April 24, first fall frost October 8 — a 167-day frost-free season.

Zone fit: challenging
Brussels sprouts needs a long season and this zone averages just 167 frost-free days. Start early, use black plastic, and plan for row cover on shoulder-season frosts.

Key dates

Start seeds indoors
March 6 – March 20
Transplant outdoors
April 3 – April 24
Expected first harvest
July 19 – August 16
Fall planting window
May 28 – June 18
Fall harvest window
September 12 – October 10

Windows are calculated from your zone's average frost dates. Adjust ±1 week for microclimates, elevation, and your own frost records.

Spacing and soil

Plant spacing
24″
Row spacing
36″
Seed depth
0.25″
Soil temperature
55–75°F
Frost tolerance
hardy
Days to harvest
100 days

Grower notes for Zone 6b

Fall-only crop in the Southeast. Top the plant 4 weeks before target harvest for uniform sprouts up the stem.

Plant near: onions, dill

Keep away from: strawberries

Other brassicas for Zone 6b

Same crop, other zones

Track your own plantings

BAU Farm Intelligence turns these windows into per-field tasks — indoor seed-start reminders, transplant dates, harvest projections — using your farm's actual frost history.