When to plant Comfrey in Valley County, MT
In Valley County, Comfrey is a spring-only crop. Plant May 20–June 3 once soil hits 50°F.
When to Plant Comfrey in Valley County, MT
Comfrey is a vigorous perennial herb valued as a dynamic accumulator of nutrients. Its leaves make excellent mulch, compost activator, and liquid fertilizer.
Valley County, Montana is in USDA Zone 4a. 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 Comfrey to ensure they mature before fall.
Valley County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Comfrey Planting Timeline — Valley County, MT
Comfrey Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 20 | May 20 – Jun 3 |
| Harvest | July 22 | Jul 22 – Sep 30 |
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 | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 4a
📆 Growing Season
131 days in Valley County
Growing Tips for Valley County
Plant root cuttings 2 inches deep. Choose Bocking 14 variety to prevent self-seeding. Cut leaves 3-4 times per season for mulch or compost. Avoid planting near pathways as it spreads.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Comfrey in Other Locations
Frequently Asked Questions
When should I plant Comfrey in Valley County, MT?
Valley County is in Zone 4a with an average last frost of May 13. Plan your Comfrey 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 4a. The average last spring frost is May 13 and first fall frost is September 21.
When should I plant Comfrey in Valley County, MT?
In Valley County, MT, plant Comfrey after the last frost (around May 13) and before the first frost (around September 21). Best results when soil holds above 50°F.
What growing zone is Valley County, MT for Comfrey?
Valley County sits in USDA Zone 4a. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.
Can Comfrey grow in Valley County's climate?
Yes — Comfrey grows well in Valley County's temperate climate. Valley County averages a 131-day frost-free season, with last frost around May 13 and first frost around September 21.
Your Valley County Garden Planner — Free
A 22-page printable planner built for Valley 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.