When to Plant Corn in Martin County, IN
Corn is a warm-season grass grown for its sweet ears, which are best eaten soon after harvest. It is wind-pollinated and must be planted in blocks for good kernel fill.
Martin County, Indiana is in USDA Zone 6a. The average last spring frost is April 13 and the first fall frost is October 21, giving you a growing season of approximately 191 days.
At an elevation of 884 feet, Martin County receives approximately 34.9 inches of rainfall annually with predominantly silt loam soil. Summer highs average 88°F, providing good warmth for Corn during the growing season.
Martin County Soil Profile
Soil Type
Silt Loam
Soil pH
6-7.1
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
Corn Planting Timeline — Martin County, IN
Corn Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | April 20 | Apr 20 – May 11 |
| Harvest | June 22 | Jun 22 – Aug 17 |
Plant 1" deep · 12" apart · Rows 36" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Direct Sow |
| May | Direct Sow |
| June | Harvest |
| July | Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
60–100 days
Soil pH
6 – 7
USDA Zone
Zone 6a
Growing Season
191 days
Growing Tips for Martin County
Plant in blocks of at least 4 rows rather than single rows for proper pollination. Direct sow after soil reaches 60F. Side-dress with nitrogen when plants are knee-high.
Companion Planting
Good Companions
Avoid Planting Near
Level Up Your Garden
Corn in Other Locations
Frequently Asked Questions
When should I plant Corn in Martin County, IN?
Martin County is in Zone 6a with an average last frost of April 13. Plan your Corn planting based on this frost date — see the calendar above for exact timing.
What planting zone is Martin County, IN?
Martin County, Indiana is in USDA Hardiness Zone 6a. The average last spring frost is April 13 and first fall frost is October 21.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Martin County gardeners in Zone 6a organize planting dates, track what's growing, and never miss a planting window.
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