When to plant Thyme in Keyes,
Plant Thyme in Keyes, between March 3 and March 17 — the only viable window. Zone 9b's short season (278 frost-free days) rules out a fall crop.
When to Plant Thyme in Keyes, CA
Top priorities for Keyes, CA gardeners in June
We've pulled the most time-sensitive tasks for Keyes, CA this June and put them front and centre. Tackle them in order.
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Harvest thyme as they ripen
If you can't use it all right away, check the food-preservation section of your planner.
Looking ahead to July
- 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.
Keyes, California is in USDA Zone 9b. The average last spring frost is February 24 and the first fall frost is November 28, giving you a growing season of approximately 277 days.
At an elevation of 2,887 feet, Stanislaus County receives approximately 15.2 inches of rainfall annually with predominantly loam soil. Summer highs average 94°F, providing good warmth for Thyme during the growing season. With low rainfall, drip irrigation is essential for growing Thyme successfully. Mulch heavily to conserve soil moisture.
Keyes Soil Profile
Soil Type
Loam
Soil pH
6.5-7.7
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 Keyes
How your county's soil matches Thyme's growing requirements.
Soil pH
Your soil pH (6.5–7.7) is within Thyme's preferred range (6.0–8.0).
Soil Texture
The loam soil in Stanislaus County is excellent for Thyme — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.6%). Annual compost additions will help Thyme.
How to Plant Thyme
Succession Planting Thyme
Sow every 8 weeks. Last sowing by Aug 30 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 | — | 3.1" | 0" | ❄️ Dormant |
| Feb | 1.3" | 3.5" | 0" | ✅ Rainfall sufficient |
| Mar | 1.3" | 2.1" | 0" | ✅ Rainfall sufficient |
| Apr | 1.3" | 1.3" | 0" | ✅ Rainfall sufficient |
| May | 1.3" | 0.5" | 0.8" | 🚿 Regular watering |
| Jun | 1.3" | 0.1" | 1.2" | 🚿 Regular watering |
| Jul | 1.3" | 0" | 1.3" | 🚿 Regular watering |
| Aug | 1.3" | 0" | 1.3" | 🚿 Regular watering |
| Sep | 1.3" | 0.2" | 1.1" | 🚿 Regular watering |
| Oct | 1.3" | 0.7" | 0.6" | 💧 Light watering |
| Nov | 1.3" | 1.5" | 0" | ✅ Rainfall sufficient |
| Dec | — | 2.2" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Feb–Nov in Stanislaus 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 — Keyes, CA
Thyme Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | March 3 | Mar 3 – Mar 17 |
| Harvest | May 12 | May 12 – Jul 14 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Transplant Outdoors |
| April | — |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Only during dry spells
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–8 · Your soil: ideal
🗺️ USDA Zone
Zone 9b
📆 Growing Season
277 days in Stanislaus County
Growing Tips for Thyme in Keyes
Direct sow Thyme outdoors after February 24 in Stanislaus 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
When should I plant Thyme in Keyes, ?
In Keyes, , plant Thyme after the last frost (around February 24) and before the first frost (around November 28). Best results when soil holds above 50°F.
What growing zone is Keyes, for Thyme?
Keyes sits in USDA Zone 9b. Thyme grows reliably in zones 4a through 9b, so it's a good fit here.
Can Thyme grow in Keyes's climate?
Yes — Thyme grows well in Keyes's temperate climate. Keyes averages a 278-day frost-free season, with last frost around February 24 and first frost around November 28.
Your Stanislaus County Garden Planner — Free
A 22-page printable planner built for Stanislaus 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.