When to plant Spinach in Mariposa County, CA
In Mariposa County, plant Spinach in spring between March 28 and April 18, once soil temps hold above 50°F. Mariposa County's last frost averages April 18, so aim for a steady week of warm soil before planting. For a fall crop, sow between September 14 and September 28 — roughly 35–50 days before the first frost on November 9.
When to Plant Spinach in Mariposa County, CA
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.
Mariposa County, California is in USDA Zone 9b. The average last spring frost is April 18 and the first fall frost is November 9, giving you a growing season of approximately 205 days.
At an elevation of 192 feet, Mariposa County receives approximately 19.2 inches of rainfall annually with predominantly loam soil. Summer highs average 91°F, providing good warmth for Spinach during the growing season. With low rainfall, drip irrigation is essential for growing Spinach successfully. Mulch heavily to conserve soil moisture.
Mariposa County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Spinach Planting Timeline — Mariposa County, CA
Spinach Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 21 | Mar 21 – Apr 4 |
| Transplant Outdoors | April 18 | Apr 18 – May 2 |
| Direct Sow | March 28 | Mar 28 – Apr 18 |
| Harvest | May 23 | May 23 – Jul 25 |
| Fall Sowing | September 14 | Sep 14 – Sep 28 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors Direct Sow |
| April | Start Indoors Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | Fall Sowing |
| 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 9b
📆 Growing Season
205 days in Mariposa County
Growing Tips for Mariposa 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 Mariposa County, CA?
Mariposa County is in Zone 9b with an average last frost of April 18. Plan your Spinach planting based on this frost date — see the calendar above for exact timing.
What planting zone is Mariposa County, CA?
Mariposa County, California is in USDA Hardiness Zone 9b. The average last spring frost is April 18 and first fall frost is November 9.
When should I plant Spinach in Mariposa County, CA?
In Mariposa County, CA, plant Spinach after the last frost (around April 18) and before the first frost (around November 9). Best results when soil holds above 50°F.
What growing zone is Mariposa County, CA for Spinach?
Mariposa County sits in USDA Zone 9b. Spinach grows reliably in zones 2a through 10b, so it's a good fit here.
Can Spinach grow in Mariposa County's climate?
Yes — Spinach grows well in Mariposa County's temperate climate. Mariposa County averages a 205-day frost-free season, with last frost around April 18 and first frost around November 9.
Your Mariposa County Garden Planner — Free
A 22-page printable planner built for Mariposa County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.