When to plant Mint in Park County, MT
Park County sits in cold Zone 5a. Plant Mint May 31–June 14 for the single annual harvest; the September 20 first frost closes the window.
When to Plant Mint in Park County, MT
Mint is a vigorous perennial herb with refreshing, aromatic leaves used in teas, cocktails, and cooking. It spreads aggressively by underground runners.
Park County, Montana is in USDA Zone 5a. The average last spring frost is May 24 and the first fall frost is September 20, giving you a growing season of approximately 119 days.
At an elevation of 6,994 feet, Park County receives approximately 22.2 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.
Park County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Mint Planting Timeline — Park County, MT
Mint Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 31 | May 31 – Jun 14 |
| Harvest | August 2 | Aug 2 – Oct 11 |
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 | — |
| 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
119 days in Park County
Growing Tips for Park 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 Park County, MT?
Park County is in Zone 5a with an average last frost of May 24. Plan your Mint planting based on this frost date — see the calendar above for exact timing.
What planting zone is Park County, MT?
Park County, Montana is in USDA Hardiness Zone 5a. The average last spring frost is May 24 and first fall frost is September 20.
When should I plant Mint in Park County, MT?
In Park County, MT, plant Mint after the last frost (around May 24) and before the first frost (around September 20). Best results when soil holds above 50°F.
What growing zone is Park County, MT for Mint?
Park 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 Park County's climate?
Yes — Mint grows well in Park County's temperate climate. Park County averages a 119-day frost-free season, with last frost around May 24 and first frost around September 20.
Your Park County Garden Planner — Free
A 22-page printable planner built for Park 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.