When to plant Garlic in Macoupin County, IL
The best window to plant Garlic in Macoupin County, is mid-spring–late spring, when soil warms to 50°F. Last frost typically hits April 11; first frost October 21. A second sowing from September 9 to September 23 extends the harvest into fall.
When to Plant Garlic in Macoupin County, IL
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.
Macoupin County, Illinois is in USDA Zone 6b. The average last spring frost is April 11 and the first fall frost is October 21, giving you a growing season of approximately 193 days.
At an elevation of 859 feet, Macoupin County receives approximately 30.9 inches of rainfall annually with predominantly silt loam soil. Summer highs average 90°F, providing good warmth for Garlic during the growing season.
Macoupin County Soil Profile
Soil Type
Silt Loam
Soil pH
6-7.2
Drainage
Well Drained
Monthly Watering Guide for Garlic
Garlic needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Garlic Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.4" | 0" | ❄️ Dormant |
| Mar | — | 2.4" | 0" | ❄️ Dormant |
| Apr | 4.3" | 2.7" | 1.6" | 💧 Light watering |
| May | 4.3" | 3.8" | 0.5" | 💧 Light watering |
| Jun | 4.3" | 4.3" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 3" | 1.3" | 💧 Light watering |
| Aug | 4.3" | 3.6" | 0.7" | 💧 Light watering |
| Sep | 4.3" | 2.7" | 1.6" | 💧 Light watering |
| Oct | 4.3" | 2.1" | 2.2" | 🚿 Regular watering |
| Nov | — | 2" | 0" | ❄️ Dormant |
| Dec | — | 1.6" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Macoupin County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Garlic Planting Timeline — Macoupin County, IL
Garlic Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Harvest | December 9 | Dec 9 – Mar 24 |
| Fall Sowing | September 9 | Sep 9 – Sep 23 |
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 6b
📆 Growing Season
193 days in Macoupin County
Growing Tips for Macoupin 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
Check more plant combinations with our Companion Planting Checker →
Garlic in Other Locations
Frequently Asked Questions
When should I plant Garlic in Macoupin County, IL?
Macoupin County is in Zone 6b with an average last frost of April 11. Plan your Garlic planting based on this frost date — see the calendar above for exact timing.
What planting zone is Macoupin County, IL?
Macoupin County, Illinois is in USDA Hardiness Zone 6b. The average last spring frost is April 11 and first fall frost is October 21.
When should I plant Garlic in Macoupin County, IL?
In Macoupin County, IL, plant Garlic after the last frost (around April 11) and before the first frost (around October 21). Best results when soil holds above 50°F.
What growing zone is Macoupin County, IL for Garlic?
Macoupin County sits in USDA Zone 6b. Garlic grows reliably in zones 3a through 9b, so it's a good fit here.
Can Garlic grow in Macoupin County's climate?
Yes — Garlic grows well in Macoupin County's temperate climate. Macoupin County averages a 193-day frost-free season, with last frost around April 11 and first frost around October 21.
Your Macoupin County Garden Planner — Free
A 22-page printable planner built for Macoupin County (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.