When to plant Thyme in Sierra County, CA
In Sierra County, Thyme is a single-season spring crop — there's no second fall window. Plant May 17–May 31 for an 70–90-day harvest, finishing well before the October 22 first frost.
When to Plant Thyme in Sierra County, CA
Top priorities for Sierra County, California gardeners in July
A quick July briefing for Sierra County, California gardeners — what's urgent, what's next, and what can wait.
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Collect thyme at their peak
Don't tug. Use scissors or pruners for clean cuts — torn stems invite disease.
August prep starts now
- First harvests: thyme
Thyme is a low-growing perennial herb with tiny, aromatic leaves and a warm, earthy flavor. It is one of the most versatile culinary and medicinal herbs.
Sierra County, California is in USDA Zone 6b. The average last spring frost is May 10 and the first fall frost is October 22, giving you a growing season of approximately 165 days.
At an elevation of 1,560 feet, Sierra County receives approximately 40.5 inches of rainfall annually with predominantly loam soil. Summer highs average 80°F, so choose short-season varieties of Thyme to ensure they mature before fall.
Sierra County Soil Profile
Soil Type
Loam
Soil pH
6.7-7.3
Drainage
Well Drained
Thyme Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Sierra County
How your county's soil matches Thyme's growing requirements.
Soil pH
Your soil pH (6.7–7.3) is within Thyme's preferred range (6.0–8.0).
Soil Texture
The loam soil in Sierra County is excellent for Thyme — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (3.0%). Annual compost additions will help Thyme.
How to Plant Thyme
Succession Planting Thyme
Sow every 8 weeks. Last sowing by Jul 24 to harvest before frost.
Thyme Water Budget
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Thyme
Thyme needs approximately 0.3 inches of water per week (1.3" per month). Here's how your county's rainfall compares month by month.
| Month | Thyme Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 8.8" | 0" | ❄️ Dormant |
| Feb | — | 8.2" | 0" | ❄️ Dormant |
| Mar | — | 5.6" | 0" | ❄️ Dormant |
| Apr | — | 3.2" | 0" | ❄️ Dormant |
| May | 1.3" | 1.1" | 0.2" | 💧 Light watering |
| Jun | 1.3" | 0.2" | 1.1" | 🚿 Regular watering |
| Jul | 1.3" | 0" | 1.3" | 🚿 Regular watering |
| Aug | 1.3" | 0" | 1.3" | 🚿 Regular watering |
| Sep | 1.3" | 0.4" | 0.9" | 🚿 Regular watering |
| Oct | 1.3" | 1.9" | 0" | ✅ Rainfall sufficient |
| Nov | — | 3.7" | 0" | ❄️ Dormant |
| Dec | — | 7.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Oct in Sierra County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Thyme Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Thyme Planting Timeline — Sierra County, CA
Thyme Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 17 | May 17 – May 31 |
| Harvest | July 26 | Jul 26 – Sep 27 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Transplant Outdoors |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Natural rainfall sufficient
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–8 · Your soil: ideal
🗺️ USDA Zone
Zone 6b
📆 Growing Season
165 days in Sierra County
Growing Tips for Thyme in Sierra County
Direct sow Thyme outdoors after May 10 in Sierra County when soil has warmed and frost danger has passed.
General growing tips
Start from seed, cuttings, or divisions. Plant in well-drained, lean soil. Prune lightly after flowering. Replace plants every 3-4 years when they become woody.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Thyme in Other Locations
Frequently Asked Questions
When should I plant Thyme in Sierra County, CA?
Sierra County is in Zone 6b with an average last frost of May 10. Plan your Thyme planting based on this frost date — see the calendar above for exact timing.
What planting zone is Sierra County, CA?
Sierra County, California is in USDA Hardiness Zone 6b. The average last spring frost is May 10 and first fall frost is October 22.
When should I plant Thyme in Sierra County, CA?
In Sierra County, CA, plant Thyme after the last frost (around May 10) and before the first frost (around October 22). Best results when soil holds above 50°F.
What growing zone is Sierra County, CA for Thyme?
Sierra County sits in USDA Zone 6b. Thyme grows reliably in zones 4a through 9b, so it's a good fit here.
Can Thyme grow in Sierra County's climate?
Yes — Thyme grows well in Sierra County's temperate climate. Sierra County averages a 165-day frost-free season, with last frost around May 10 and first frost around October 22.
Your Sierra County Garden Planner — Free
A 22-page printable planner built for Sierra County (Zone 6b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.