When to plant Geraniums in Lake County, MT
In Lake County, Geraniums is a spring-only crop. Plant June 7–June 21 once soil hits 50°F.
When to Plant Geraniums in Lake County, MT
Geraniums (Pelargonium × hortorum) are tender perennials grown as warm-season annuals throughout North America. Prized for their bold flower clusters, long bloom period, and tolerance of summer heat when planted in well-drained soil, they anchor window boxes, containers, and bed borders from late spring until hard frost. Zones 9b–11b can overwinter plants in the ground.
Lake County, Montana is in USDA Zone 6a. The average last spring frost is May 31 and the first fall frost is September 12, giving you a growing season of approximately 104 days.
At an elevation of 6,938 feet, Lake County receives approximately 12.8 inches of rainfall annually with predominantly loam soil. Summer highs average 85°F, providing good warmth for Geraniums during the growing season. With low rainfall, drip irrigation is essential for growing Geraniums successfully. Mulch heavily to conserve soil moisture.
Lake County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Geraniums Planting Timeline — Lake County, MT
Geraniums Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 22 | Mar 22 – Apr 5 |
| Transplant Outdoors | June 7 | Jun 7 – Jun 21 |
| Bloom | August 16 | Aug 16 – Nov 15 |
Plant 0.1" deep · 12" apart · Rows 14" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors |
| May | — |
| June | Transplant Outdoors |
| July | — |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | Bloom |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
70–100 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 6a
📆 Growing Season
104 days in Lake County
Growing Tips for Lake County
Start seeds indoors 10–12 weeks before last frost — germination is slow and erratic without bottom heat (70–75°F). Transplant after frost danger passes. Geraniums rarely direct-sown; cuttings or transplants are the standard. Deadhead spent umbels weekly to maintain continuous bloom. Let soil dry slightly between waterings to prevent root rot. In zones 10–11 plants may be left in ground year-round or overwintered as houseplants.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Geraniums in Other Locations
Frequently Asked Questions
When should I plant Geraniums in Lake County, MT?
Lake County is in Zone 6a with an average last frost of May 31. Plan your Geraniums planting based on this frost date — see the calendar above for exact timing.
What planting zone is Lake County, MT?
Lake County, Montana is in USDA Hardiness Zone 6a. The average last spring frost is May 31 and first fall frost is September 12.
When should I plant Geraniums in Lake County, MT?
In Lake County, MT, plant Geraniums after the last frost (around May 31) and before the first frost (around September 12). Best results when soil holds above 50°F.
What growing zone is Lake County, MT for Geraniums?
Lake County sits in USDA Zone 6a. Geraniums grows reliably in zones 2a through 11b, so it's a good fit here.
Can Geraniums grow in Lake County's climate?
Yes — Geraniums grows well in Lake County's temperate climate. Lake County averages a 104-day frost-free season, with last frost around May 31 and first frost around September 12.
Your Lake County Garden Planner — Free
A 22-page printable planner built for Lake County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.