When to Plant Sweet Corn in Daniels County, MT
Sweet corn is bred for high sugar content in its kernels, which convert to starch rapidly after harvest. Modern supersweet varieties hold their sweetness longer.
Daniels County, Montana is in USDA Zone 3b. The average last spring frost is May 20 and the first fall frost is September 16, giving you a growing season of approximately 119 days.
At an elevation of 6,023 feet, Daniels County receives approximately 15.5 inches of rainfall annually with predominantly loam soil. Summer highs average 78°F, so choose short-season varieties of Sweet Corn to ensure they mature before fall. With low rainfall, drip irrigation is essential for growing Sweet Corn successfully. Mulch heavily to conserve soil moisture.
Daniels County Soil Profile
Soil Type
Loam
Soil pH
6.3-7.8
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
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Sweet Corn Planting Timeline — Daniels County, MT
Sweet Corn Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | June 3 | Jun 3 – Jun 24 |
| Harvest | August 5 | Aug 5 – Sep 16 |
Plant 1" deep · 12" apart · Rows 36" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | — |
| June | Direct Sow |
| July | — |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
60–90 days
Soil pH
6 – 7
USDA Zone
Zone 3b
Growing Season
119 days
Growing Tips for Daniels County
Plant in blocks of at least 4 rows for wind pollination. Direct sow after soil is warm. Isolate supersweet varieties from other corn types to prevent cross-pollination.
Companion Planting
Good Companions
Avoid Planting Near
Level Up Your Garden
Sweet Corn in Other Locations
Frequently Asked Questions
When should I plant Sweet Corn in Daniels County, MT?
Daniels County is in Zone 3b with an average last frost of May 20. Plan your Sweet Corn planting based on this frost date — see the calendar above for exact timing.
What planting zone is Daniels County, MT?
Daniels County, Montana is in USDA Hardiness Zone 3b. The average last spring frost is May 20 and first fall frost is September 16.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Daniels County gardeners in Zone 3b organize planting dates, track what's growing, and never miss a planting window.
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