When to Plant Thyme in Powell County, MT
Thyme is a low-growing perennial herb with tiny, aromatic leaves and a warm, earthy flavor. It is one of the most versatile culinary and medicinal herbs.
Powell County, Montana is in USDA Zone 4a. The average last spring frost is June 6 and the first fall frost is September 8, giving you a growing season of approximately 94 days.
At an elevation of 5,514 feet, Powell County receives approximately 22.9 inches of rainfall annually with predominantly loam soil. Summer highs average 84°F, so choose short-season varieties of Thyme to ensure they mature before fall.
Powell County Soil Profile
Soil Type
Loam
Soil pH
6.5-8.2
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.
Soil Compatibility in Powell County
How your county's soil matches Thyme's growing requirements.
Soil pH
Your soil pH (6.5–8.2) overlaps with Thyme's range (6.0–8.0), though not a perfect match.
Soil Texture
The loam soil in Powell County is excellent for Thyme — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.4%). Annual compost additions will help Thyme.
How to Plant Thyme
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Thyme Planting Timeline — Powell County, MT
Thyme Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | June 13 | Jun 13 – Jun 27 |
| Harvest | August 22 | Aug 22 – Oct 24 |
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
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Natural rainfall sufficient
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–8 · Your soil: acceptable
🗺️ USDA Zone
Zone 4a
📆 Growing Season
94 days in Powell County
Growing Tips for Thyme in Powell County
Direct sow Thyme outdoors after June 06 in Powell County when soil has warmed and frost danger has passed.
Your 94.0-day growing season in Powell County is tight for Thyme (70.0-90.0 days to maturity). Start indoors and choose early-maturing varieties.
General growing tips
Start from seed, cuttings, or divisions. Plant in well-drained, lean soil. Prune lightly after flowering. Replace plants every 3-4 years when they become woody.
Companion Planting
Good Companions
Level Up Your Garden
Thyme in Other Locations
Frequently Asked Questions
When should I plant Thyme in Powell County, MT?
Powell County is in Zone 4a with an average last frost of June 6. Plan your Thyme planting based on this frost date — see the calendar above for exact timing.
What planting zone is Powell County, MT?
Powell County, Montana is in USDA Hardiness Zone 4a. The average last spring frost is June 6 and first fall frost is September 8.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Powell County gardeners in Zone 4a organize planting dates, track what's growing, and never miss a planting window.
Get Your Free Garden Planner →Free download. Plan your entire garden season in minutes.