When to plant Mint in Granite County, MT
Granite County sits in cold Zone 5a. Plant Mint June 5–June 19 for the single annual harvest; the September 20 first frost closes the window.
When to Plant Mint in Granite County, MT
Mint is a vigorous perennial herb with refreshing, aromatic leaves used in teas, cocktails, and cooking. It spreads aggressively by underground runners.
Granite County, Montana is in USDA Zone 5a. The average last spring frost is May 29 and the first fall frost is September 20, giving you a growing season of approximately 114 days.
At an elevation of 7,177 feet, Granite County receives approximately 18.9 inches of rainfall annually with predominantly loam soil. Summer highs average 81°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.
Granite County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Mint Planting Timeline — Granite County, MT
Mint Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | June 5 | Jun 5 – Jun 19 |
| Harvest | August 7 | Aug 7 – Oct 16 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | — |
| June | Transplant Outdoors |
| July | — |
| 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 5a
📆 Growing Season
114 days in Granite County
Growing Tips for Granite 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 Granite County, MT?
Granite County is in Zone 5a with an average last frost of May 29. Plan your Mint planting based on this frost date — see the calendar above for exact timing.
What planting zone is Granite County, MT?
Granite County, Montana is in USDA Hardiness Zone 5a. The average last spring frost is May 29 and first fall frost is September 20.
When should I plant Mint in Granite County, MT?
In Granite County, MT, plant Mint after the last frost (around May 29) and before the first frost (around September 20). Best results when soil holds above 50°F.
What growing zone is Granite County, MT for Mint?
Granite County sits in USDA Zone 5a. Mint grows reliably in zones 3a through 10b, so it's a good fit here.
Can Mint grow in Granite County's climate?
Yes — Mint grows well in Granite County's temperate climate. Granite County averages a 114-day frost-free season, with last frost around May 29 and first frost around September 20.
Your Granite County Garden Planner — Free
A 22-page printable planner built for Granite County (Zone 5a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.