When to plant Comfrey in Custer County, MT
Plant Comfrey in Custer County during the brief May 21–June 4 window. With 136 frost-free days, fall plantings can't mature before September 27.
When to Plant Comfrey in Custer 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.
Custer County, Montana is in USDA Zone 4b. The average last spring frost is May 14 and the first fall frost is September 27, giving you a growing season of approximately 136 days.
At an elevation of 5,983 feet, Custer County receives approximately 24 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.
Custer County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Comfrey Planting Timeline — Custer County, MT
Comfrey 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
Moderate — regular watering
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 4b
📆 Growing Season
136 days in Custer County
Growing Tips for Custer 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 Custer County, MT?
Custer County is in Zone 4b with an average last frost of May 14. Plan your Comfrey planting based on this frost date — see the calendar above for exact timing.
What planting zone is Custer County, MT?
Custer County, Montana is in USDA Hardiness Zone 4b. The average last spring frost is May 14 and first fall frost is September 27.
When should I plant Comfrey in Custer County, MT?
In Custer County, MT, plant Comfrey after the last frost (around May 14) and before the first frost (around September 27). Best results when soil holds above 50°F.
What growing zone is Custer County, MT for Comfrey?
Custer County sits in USDA Zone 4b. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.
Can Comfrey grow in Custer County's climate?
Yes — Comfrey grows well in Custer County's temperate climate. Custer County averages a 136-day frost-free season, with last frost around May 14 and first frost around September 27.
Your Custer County Garden Planner — Free
A 22-page printable planner built for Custer County (Zone 4b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.