When to Plant Scallions in Valley County, MT
Scallions (green onions) are mild-flavored alliums harvested for their slender green tops and white bases. They are quick-growing and perfect for succession planting.
Valley County, Montana is in USDA Zone 3b. The average last spring frost is May 13 and the first fall frost is September 21, giving you a growing season of approximately 131 days.
At an elevation of 8,293 feet, Valley County receives approximately 23.2 inches of rainfall annually with predominantly loam soil. Summer highs average 80°F, so choose short-season varieties of Scallions to ensure they mature before fall.
Valley County Soil Profile
Soil Type
Loam
Soil pH
6.6-8.2
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
Scallions Planting Timeline — Valley County, MT
Scallions Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | April 1 | Apr 1 – Apr 15 |
| Transplant Outdoors | May 13 | May 13 – May 27 |
| Direct Sow | May 6 | May 6 – May 27 |
| Fall Sowing | June 29 | Jun 29 – Jul 13 |
| Harvest | July 8 | Jul 8 – Aug 5 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Start Indoors |
| May | Transplant Outdoors Direct Sow |
| June | Fall Sowing |
| July | Fall Sowing Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
50–70 days
Soil pH
6 – 7
USDA Zone
Zone 3b
Growing Season
131 days
Growing Tips for Valley County
Direct sow every 3 weeks for continuous harvest. Thin to 1 inch apart or grow in clusters. Harvest when pencil-thick by pulling or cutting at soil level.
Companion Planting
Good Companions
Avoid Planting Near
Level Up Your Garden
Scallions in Other Locations
Frequently Asked Questions
When should I plant Scallions in Valley County, MT?
Valley County is in Zone 3b with an average last frost of May 13. Plan your Scallions planting based on this frost date — see the calendar above for exact timing.
What planting zone is Valley County, MT?
Valley County, Montana is in USDA Hardiness Zone 3b. The average last spring frost is May 13 and first fall frost is September 21.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Valley County gardeners in Zone 3b organize planting dates, track what's growing, and never miss a planting window.
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