When to plant garlic in USDA Zone 6a

Plan your garlic 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.

Western NC mountains, southern PA, central OH, northern MO. Average last spring frost May 1, first fall frost October 1 — a 153-day frost-free season.

Zone fit: challenging
Garlic needs a long season and this zone averages just 153 frost-free days. Start early, use black plastic, and plan for row cover on shoulder-season frosts.

Key dates

Direct-seed outdoors
July 17 – August 7
Expected first harvest
March 21 – April 18
Fall planting window
August 27 – September 17
Fall harvest window
May 1 – May 29

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
6″
Row spacing
12″
Seed depth
2″
Soil temperature
45–60°F
Frost tolerance
hardy
Days to harvest
240 days

Grower notes for Zone 6a

Fall-planted only. Plant 4–6 weeks before first frost so roots establish before soil freezes. Harvest when lower 3 leaves brown.

Plant near: tomatoes, brassicas

Keep away from: beans, peas

Other alliums for Zone 6a

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.