When to Plant Corn in Mifflin County, PA
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.
Mifflin County, Pennsylvania is in USDA Zone 6a. The average last spring frost is April 24 and the first fall frost is October 22, giving you a growing season of approximately 181 days.
At an elevation of 1,022 feet, Mifflin County receives approximately 45.7 inches of rainfall annually with predominantly silt loam soil. Summer highs average 87°F, providing good warmth for Corn during the growing season.
Mifflin County Soil Profile
Soil Type
Silt Loam
Soil pH
4.9-6.4
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.
Soil Compatibility in Mifflin County
How your county's soil matches Corn's growing requirements.
Soil pH
Your soil pH (4.9–6.4) is more acidic than Corn prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
The silt loam soil in Mifflin County is excellent for Corn — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (3.2%). Annual compost additions will help Corn.
How to Plant Corn
Succession Planting Corn
Sow every 6.9 weeks. Last sowing by Jul 14 to harvest before frost.
Plant Water Budget
Corn Planting Timeline — Mifflin County, PA
Corn Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | May 1 | May 1 – May 22 |
| Harvest | July 3 | Jul 3 – Aug 28 |
Plant 1" deep · 12" apart · Rows 36" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Direct Sow |
| June | — |
| July | Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1.5"/week · 1-2 times/week
📅 Days to Maturity
60–100 days
🧪 Soil pH
Needs 6–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 6a
📆 Growing Season
181 days in Mifflin County
Growing Tips for Corn in Mifflin County
Direct sow Corn outdoors after April 24 in Mifflin County when soil has warmed and frost danger has passed.
Common pests for Corn in this region include corn earworm and corn borers. Use row covers early in the season and inspect plants weekly.
General growing tips
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 Mifflin County, PA?
Mifflin County is in Zone 6a with an average last frost of April 24. Plan your Corn planting based on this frost date — see the calendar above for exact timing.
What planting zone is Mifflin County, PA?
Mifflin County, Pennsylvania is in USDA Hardiness Zone 6a. The average last spring frost is April 24 and first fall frost is October 22.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Mifflin County gardeners in Zone 6a organize planting dates, track what's growing, and never miss a planting window.
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