When to plant Garlic in Sullivan County, MO
Plant Garlic in Sullivan County from mid-spring to late spring in spring. Sullivan County sits in USDA Zone 6a, with last frost around April 17 and first frost on October 17. A second sowing from September 5 to September 19 extends the harvest into fall.
When to Plant Garlic in Sullivan County, MO
Garlic is a pungent allium planted in fall and harvested the following summer. Hardneck varieties produce edible flower stalks (scapes) and are more cold-hardy.
Sullivan County, Missouri is in USDA Zone 6a. The average last spring frost is April 17 and the first fall frost is October 17, giving you a growing season of approximately 183 days.
At an elevation of 1,019 feet, Sullivan County receives approximately 34.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 84°F, so choose short-season varieties of Garlic to ensure they mature before fall.
Sullivan County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Garlic Planting Timeline — Sullivan County, MO
Garlic Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Harvest | December 5 | Dec 5 – Mar 20 |
| Fall Sowing | September 5 | Sep 5 – Sep 19 |
Plant 1" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Harvest |
| February | Harvest |
| March | Harvest |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | Fall Sowing |
| October | — |
| November | — |
| December | Harvest |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
90–240 days
🧪 Soil pH
Needs 6–7.5 · Your soil: N/A
🗺️ USDA Zone
Zone 6a
📆 Growing Season
183 days in Sullivan County
Growing Tips for Sullivan County
Plant individual cloves pointed end up in fall, 6 weeks before ground freezes. Mulch heavily with straw. Harvest when lower leaves begin to brown but 5-6 green leaves remain.
Companion Planting
Good Companions
Avoid Planting Near
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Garlic in Other Locations
Frequently Asked Questions
When should I plant Garlic in Sullivan County, MO?
Sullivan County is in Zone 6a with an average last frost of April 17. Plan your Garlic planting based on this frost date — see the calendar above for exact timing.
What planting zone is Sullivan County, MO?
Sullivan County, Missouri is in USDA Hardiness Zone 6a. The average last spring frost is April 17 and first fall frost is October 17.
When should I plant Garlic in Sullivan County, MO?
In Sullivan County, MO, plant Garlic after the last frost (around April 17) and before the first frost (around October 17). Best results when soil holds above 50°F.
What growing zone is Sullivan County, MO for Garlic?
Sullivan County sits in USDA Zone 6a. Garlic grows reliably in zones 3a through 9b, so it's a good fit here.
Can Garlic grow in Sullivan County's climate?
Yes — Garlic grows well in Sullivan County's temperate climate. Sullivan County averages a 183-day frost-free season, with last frost around April 17 and first frost around October 17.
Your Sullivan County Garden Planner — Free
A 22-page printable planner built for Sullivan County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.