When to plant Chervil in Carroll County, IA
Aim to plant Chervil in Carroll County on or after April 13; the window stays open through May 4. Carroll County's 161-day frost-free season gives you a single solid spring crop with a brief fall option. A second sowing from July 27 to August 10 extends the harvest into fall.
When to Plant Chervil in Carroll County, IA
July in Carroll County, Iowa — your action list
July is a pivotal month for Carroll County, Iowa gardens. Focus on these tasks first and you'll set up the rest of the season for success.
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Bring in the chervil
If you can't use it all right away, check the food-preservation section of your planner.
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Start your fall crops: chervil
Mid-season soil is hot. Sow a bit deeper than the packet suggests to find cooler, damper ground.
Get ahead of August
- First harvests: chervil
Chervil is a delicate herb with a subtle anise-parsley flavor, essential in French cuisine as part of fines herbes. It prefers cool conditions and partial shade.
Carroll County, Iowa is in USDA Zone 5a. The average last spring frost is April 27 and the first fall frost is October 5, giving you a growing season of approximately 161 days.
At an elevation of 751 feet, Carroll County receives approximately 38.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 87°F, providing good warmth for Chervil during the growing season.
Carroll County Soil Profile
Soil Type
Silt Loam
Soil pH
6.1-6.9
Drainage
Well Drained
Chervil 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 Carroll County
How your county's soil matches Chervil's growing requirements.
Soil pH
Your soil pH (6.1–6.9) is within Chervil's preferred range (6.0–7.0).
Soil Texture
The silt loam soil in Carroll County is excellent for Chervil — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (5.1%) — Chervil will thrive.
How to Plant Chervil
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Chervil
Sow every 4.6 weeks. Last sowing by Aug 06 to harvest before frost.
For a dedicated fall crop, sow by Jul 27.
Chervil Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Chervil
Chervil needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Chervil Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.6" | 0" | ❄️ Dormant |
| Feb | — | 1.6" | 0" | ❄️ Dormant |
| Mar | — | 2.8" | 0" | ❄️ Dormant |
| Apr | 2.2" | 4.2" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 4.6" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 4.9" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 3.6" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 4.2" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 3" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.9" | 0" | ❄️ Dormant |
| Dec | — | 1.8" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Carroll County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Chervil 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.
Chervil Planting Timeline — Carroll County, IA
Chervil Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 23 | Mar 23 – Apr 6 |
| Transplant Outdoors | April 20 | Apr 20 – May 4 |
| Direct Sow | April 13 | Apr 13 – May 4 |
| Harvest | June 1 | Jun 1 – Aug 3 |
| Fall Sowing | July 27 | Jul 27 – Aug 10 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors |
| April | Start Indoors Transplant Outdoors Direct Sow |
| May | Transplant Outdoors Direct Sow |
| June | Harvest |
| July | Fall Sowing Harvest |
| August | Fall Sowing Harvest |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
40–60 days
🧪 Soil pH
Needs 6–7 · Your soil: ideal
🗺️ USDA Zone
Zone 5a
📆 Growing Season
161 days in Carroll County
Growing Tips for Chervil in Carroll County
Direct sow Chervil outdoors after April 27 in Carroll County when soil has warmed and frost danger has passed.
Your generous 161.0-day season in Carroll County allows multiple plantings of Chervil. Sow every 20.0 days for continuous harvest.
Common pests for Chervil 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 early spring or fall as chervil bolts in heat. Provide shade and cool conditions. Harvest outer leaves as needed; use fresh as it loses flavor when dried.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Chervil in Other Locations
Frequently Asked Questions
When should I plant Chervil in Carroll County, IA?
Carroll County is in Zone 5a with an average last frost of April 27. Plan your Chervil planting based on this frost date — see the calendar above for exact timing.
What planting zone is Carroll County, IA?
Carroll County, Iowa is in USDA Hardiness Zone 5a. The average last spring frost is April 27 and first fall frost is October 5.
When should I plant Chervil in Carroll County, IA?
In Carroll County, IA, plant Chervil after the last frost (around April 27) and before the first frost (around October 5). Best results when soil holds above 50°F.
What growing zone is Carroll County, IA for Chervil?
Carroll County sits in USDA Zone 5a. Chervil grows reliably in zones 3a through 10b, so it's a good fit here.
Can Chervil grow in Carroll County's climate?
Yes — Chervil grows well in Carroll County's temperate climate. Carroll County averages a 161-day frost-free season, with last frost around April 27 and first frost around October 5.
Your Carroll County Garden Planner — Free
A 22-page printable planner built for Carroll County (Zone 5a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.