When to plant radishes in USDA Zone 6b

Plan your radishes 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: excellent
Radishes is well suited to Zone 6b. Standard planting dates work with minor adjustments for microclimates.

Key dates

Direct-seed outdoors
March 20 – April 10
Expected first harvest
April 24 – May 22
Fall planting window
August 20 – September 10
Fall harvest window
September 24 – October 22

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
1″
Row spacing
12″
Seed depth
0.5″
Soil temperature
45–70°F
Frost tolerance
hardy
Days to harvest
28 days

Grower notes for Zone 6b

Fastest crop in the garden. Interplant with slow germinators like carrots to mark rows.

Plant near: cucumbers, carrots, lettuce

Keep away from: hyssop

Other root crops 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.