When to plant Fennel (herb) in Sierra County County,
Spring Fennel (herb) in Sierra County County goes in April 26–May 17, once nighttime temps stop dipping near freezing. A second sowing from August 13 to August 27 extends the harvest into fall.
When to Plant Fennel (herb) in Sierra County, CA
June in Sierra County, California — your action list
Welcome to June in Zone 6b. These are the moves that will have the biggest impact on your growing season.
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Start fennel (herb) under lights
A seed-starting mix and a sunny window (or a grow light) are all you need. Keep soil warm — around 70°F — for fast germination.
July prep starts now
- First harvests: fennel (herb)
Herb fennel is grown for its aromatic leaves, stalks, and seeds rather than a bulb. It has a strong anise flavor and its flowers attract beneficial insects.
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 Fennel (herb) to ensure they mature before fall.
Sierra County Soil Profile
Soil Type
Loam
Soil pH
6.7-7.3
Drainage
Well Drained
Fennel (herb) 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 Fennel (herb)'s growing requirements.
Soil pH
Your soil pH (6.7–7.3) overlaps with Fennel (herb)'s range (5.5–7.0), though not a perfect match.
Soil Texture
The loam soil in Sierra County is excellent for Fennel (herb) — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (3.0%). Annual compost additions will help Fennel (herb).
How to Plant Fennel (herb)
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Fennel (herb)
Sow every 6.9 weeks. Last sowing by Jul 24 to harvest before frost.
For a dedicated fall crop, sow by Aug 13.
Fennel (herb) Water Budget
Water stress score is 8/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Fennel (herb)
Fennel (herb) needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Fennel (herb) 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 | 4.3" | 1.1" | 3.2" | 🚿 Regular watering |
| Jun | 4.3" | 0.2" | 4.1" | 🚿 Regular watering |
| Jul | 4.3" | 0" | 4.3" | 🚿 Regular watering |
| Aug | 4.3" | 0" | 4.3" | 🚿 Regular watering |
| Sep | 4.3" | 0.4" | 3.9" | 🚿 Regular watering |
| Oct | 4.3" | 1.9" | 2.4" | 🚿 Regular watering |
| 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.
Fennel (herb) 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.
Fennel (herb) Planting Timeline — Sierra County, CA
Fennel (herb) Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | April 5 | Apr 5 – Apr 19 |
| Transplant Outdoors | May 3 | May 3 – May 17 |
| Direct Sow | April 26 | Apr 26 – May 17 |
| Harvest | July 5 | Jul 5 – Sep 13 |
| Fall Sowing | August 13 | Aug 13 – Aug 27 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Start Indoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Harvest |
| August | Fall Sowing Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 5.5–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 6b
📆 Growing Season
165 days in Sierra County
Growing Tips for Fennel (herb) in Sierra County
Direct sow Fennel (herb) outdoors after May 10 in Sierra County when soil has warmed and frost danger has passed.
Common pests for Fennel (herb) in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in spring or fall. Unlike Florence fennel, herb fennel does not form a bulb. Harvest fronds as needed and seeds when they turn brown. Self-sows readily.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Fennel (herb) in Other Locations
Frequently Asked Questions
When should I plant Fennel (herb) in Sierra County, CA?
Sierra County is in Zone 6b with an average last frost of May 10. Plan your Fennel (herb) 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 Fennel (herb) in Sierra County County, ?
In Sierra County County, , plant Fennel (herb) 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 County, for Fennel (herb)?
Sierra County County sits in USDA Zone 6b. Fennel (herb) grows reliably in zones 4a through 10b, so it's a good fit here.
Can Fennel (herb) grow in Sierra County County's climate?
Yes — Fennel (herb) grows well in Sierra County County's temperate climate. Sierra County 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.