When to Plant Feverfew in Rock Island County, IL
Feverfew is a bushy perennial herb with small daisy-like flowers and aromatic leaves. It has been used traditionally for headache relief and is a cheerful garden plant.
Rock Island County, Illinois is in USDA Zone 5a. The average last spring frost is April 15 and the first fall frost is October 19, giving you a growing season of approximately 187 days.
At an elevation of 1,172 feet, Rock Island County receives approximately 35.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83°F, so choose short-season varieties of Feverfew to ensure they mature before fall.
Rock Island County Soil Profile
Soil Type
Silt Loam
Soil pH
6.3-6.9
Drainage
Well Drained
Plant 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.
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Feverfew Planting Timeline — Rock Island County, IL
Feverfew Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | April 22 | Apr 22 – May 6 |
| Harvest | July 22 | Jul 22 – Oct 7 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Transplant Outdoors |
| May | Transplant Outdoors |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Low — drought tolerant
Days to Maturity
90–120 days
Soil pH
6 – 7
USDA Zone
Zone 5a
Growing Season
187 days
Growing Tips for Rock Island County
Start seeds indoors or direct sow on the soil surface. Deadhead regularly to prevent aggressive self-seeding. Divide clumps every 2-3 years to maintain vigor.
Companion Planting
Good Companions
Level Up Your Garden
Feverfew in Other Locations
Frequently Asked Questions
When should I plant Feverfew in Rock Island County, IL?
Rock Island County is in Zone 5a with an average last frost of April 15. Plan your Feverfew planting based on this frost date — see the calendar above for exact timing.
What planting zone is Rock Island County, IL?
Rock Island County, Illinois is in USDA Hardiness Zone 5a. The average last spring frost is April 15 and first fall frost is October 19.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Rock Island County gardeners in Zone 5a organize planting dates, track what's growing, and never miss a planting window.
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