When to plant Mint in Hill County, MT
Hill County's 132-day season only supports one Mint planting per year. Sow between May 21 and June 4 for the best chance at full maturity before September 23.
When to Plant Mint in Hill County, MT
Mint is a vigorous perennial herb with refreshing, aromatic leaves used in teas, cocktails, and cooking. It spreads aggressively by underground runners.
Hill County, Montana is in USDA Zone 4a. The average last spring frost is May 14 and the first fall frost is September 23, giving you a growing season of approximately 132 days.
At an elevation of 5,229 feet, Hill County receives approximately 14.4 inches of rainfall annually with predominantly loam soil. Summer highs average 80°F, so choose short-season varieties of Mint to ensure they mature before fall. With low rainfall, drip irrigation is essential for growing Mint successfully. Mulch heavily to conserve soil moisture.
Hill County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Mint Planting Timeline — Hill County, MT
Mint Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 21 | May 21 – Jun 4 |
| Harvest | July 23 | Jul 23 – Oct 1 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Transplant Outdoors |
| June | Transplant Outdoors |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
High — keep soil consistently moist
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 4a
📆 Growing Season
132 days in Hill County
Growing Tips for Hill County
Always grow mint in containers or with underground barriers to control spreading. Harvest regularly to keep plants compact. Cut plants back in late summer for a fresh fall flush.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Mint in Other Locations
Frequently Asked Questions
When should I plant Mint in Hill County, MT?
Hill County is in Zone 4a with an average last frost of May 14. Plan your Mint planting based on this frost date — see the calendar above for exact timing.
What planting zone is Hill County, MT?
Hill County, Montana is in USDA Hardiness Zone 4a. The average last spring frost is May 14 and first fall frost is September 23.
When should I plant Mint in Hill County, MT?
In Hill County, MT, plant Mint after the last frost (around May 14) and before the first frost (around September 23). Best results when soil holds above 50°F.
What growing zone is Hill County, MT for Mint?
Hill County sits in USDA Zone 4a. Mint grows reliably in zones 3a through 10b, so it's a good fit here.
Can Mint grow in Hill County's climate?
Yes — Mint grows well in Hill County's temperate climate. Hill County averages a 132-day frost-free season, with last frost around May 14 and first frost around September 23.
Your Hill County Garden Planner — Free
A 22-page printable planner built for Hill County (Zone 4a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.