When to Plant Sunchoke in Spencer County, IN
Sunchokes (Jerusalem artichokes) are a native sunflower relative grown for their knobby, nutty-flavored tubers. They are extremely productive and nearly impossible to eradicate.
Spencer County, Indiana is in USDA Zone 6b. The average last spring frost is April 9 and the first fall frost is October 25, giving you a growing season of approximately 199 days.
At an elevation of 1,204 feet, Spencer County receives approximately 33.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 86°F, providing good warmth for Sunchoke during the growing season.
Spencer County Soil Profile
Soil Type
Silt Loam
Soil pH
6-7
Drainage
Well Drained
Plant Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Plant Water Budget
Sunchoke Planting Timeline — Spencer County, IN
Sunchoke Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | April 23 | Apr 23 – May 7 |
| Harvest | August 13 | Aug 13 – Oct 8 |
Plant 1" deep · 30" apart · Rows 42" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Transplant Outdoors |
| May | Transplant Outdoors |
| June | — |
| July | — |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
110–150 days
Soil pH
6 – 7.5
USDA Zone
Zone 6b
Growing Season
199 days
Growing Tips for Spencer County
Plant tubers 4 inches deep in early spring. Contain plants with barriers as they spread aggressively. Harvest after frost or leave in ground and dig as needed through winter.
Companion Planting
Good Companions
Level Up Your Garden
Sunchoke in Other Locations
Frequently Asked Questions
When should I plant Sunchoke in Spencer County, IN?
Spencer County is in Zone 6b with an average last frost of April 9. Plan your Sunchoke planting based on this frost date — see the calendar above for exact timing.
What planting zone is Spencer County, IN?
Spencer County, Indiana is in USDA Hardiness Zone 6b. The average last spring frost is April 9 and first fall frost is October 25.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Spencer County gardeners in Zone 6b organize planting dates, track what's growing, and never miss a planting window.
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