When to plant Spinach in Treasure County, MT
In Treasure County, plant Spinach in spring between May 4 and May 25, once soil temps hold above 50°F. Treasure County's last frost averages May 11, so be cautious and check the 10-day forecast before planting tender crops. For a fall crop, sow between July 9 and July 23 — roughly 35–50 days before the first frost on October 1.
When to Plant Spinach in Treasure County, MT
Spinach is a nutrient-packed cool-season green that grows quickly in spring and fall. It is rich in iron, vitamins, and antioxidants and excellent raw or cooked.
Treasure County, Montana is in USDA Zone 4b. The average last spring frost is May 11 and the first fall frost is October 1, giving you a growing season of approximately 143 days.
At an elevation of 6,726 feet, Treasure County receives approximately 17.1 inches of rainfall annually with predominantly loam soil. Summer highs average 84°F, so choose short-season varieties of Spinach to ensure they mature before fall. With low rainfall, drip irrigation is essential for growing Spinach successfully. Mulch heavily to conserve soil moisture.
Treasure County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Spinach Planting Timeline — Treasure County, MT
Spinach Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 30 | Mar 30 – Apr 13 |
| Transplant Outdoors | May 11 | May 11 – May 25 |
| Direct Sow | May 4 | May 4 – May 25 |
| Harvest | June 15 | Jun 15 – Aug 17 |
| Fall Sowing | July 9 | Jul 9 – Jul 23 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors |
| May | Transplant Outdoors Direct Sow |
| June | Harvest |
| July | Fall Sowing Harvest |
| August | Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
35–50 days
🧪 Soil pH
Needs 6.5–7.5 · Your soil: N/A
🗺️ USDA Zone
Zone 4b
📆 Growing Season
143 days in Treasure County
Growing Tips for Treasure County
Direct sow as soon as soil can be worked in spring. Plant in partial shade for summer crops to delay bolting. Succession plant every 2 weeks for continuous harvest.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Wind pollinated — isolate 1/2 mile for purity. Easy to let bolt in heat.
Spinach in Other Locations
Frequently Asked Questions
When should I plant Spinach in Treasure County, MT?
Treasure County is in Zone 4b with an average last frost of May 11. Plan your Spinach planting based on this frost date — see the calendar above for exact timing.
What planting zone is Treasure County, MT?
Treasure County, Montana is in USDA Hardiness Zone 4b. The average last spring frost is May 11 and first fall frost is October 1.
When should I plant Spinach in Treasure County, MT?
In Treasure County, MT, plant Spinach after the last frost (around May 11) and before the first frost (around October 1). Best results when soil holds above 50°F.
What growing zone is Treasure County, MT for Spinach?
Treasure County sits in USDA Zone 4b. Spinach grows reliably in zones 2a through 10b, so it's a good fit here.
Can Spinach grow in Treasure County's climate?
Yes — Spinach grows well in Treasure County's temperate climate. Treasure County averages a 143-day frost-free season, with last frost around May 11 and first frost around October 1.
Your Treasure County Garden Planner — Free
A 22-page printable planner built for Treasure 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.