When to Plant Echinacea in Portage County, WI
Echinacea (purple coneflower) is a native prairie perennial valued for its immune-supporting properties and beautiful daisy-like flowers that attract pollinators.
Portage County, Wisconsin is in USDA Zone 4b. The average last spring frost is May 5 and the first fall frost is October 6, giving you a growing season of approximately 154 days.
At an elevation of 1,008 feet, Portage County receives approximately 37.6 inches of rainfall annually with predominantly silt loam soil. Summer highs average 81°F, so choose short-season varieties of Echinacea to ensure they mature before fall.
Portage County Soil Profile
Soil Type
Silt Loam
Soil pH
5.9-7.1
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
Echinacea Planting Timeline — Portage County, WI
Echinacea Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 12 | May 12 – May 26 |
| Harvest | September 15 | Sep 15 – Oct 6 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Transplant Outdoors |
| June | — |
| July | — |
| August | — |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Low — drought tolerant
Days to Maturity
120–180 days
Soil pH
6 – 7
USDA Zone
Zone 4b
Growing Season
154 days
Growing Tips for Portage County
Start seeds indoors 8-10 weeks before last frost or direct sow in fall for spring germination. Seeds need cold stratification. Deadhead to prolong blooming or leave seed heads for birds.
Companion Planting
Good Companions
Level Up Your Garden
Echinacea in Other Locations
Frequently Asked Questions
When should I plant Echinacea in Portage County, WI?
Portage County is in Zone 4b with an average last frost of May 5. Plan your Echinacea planting based on this frost date — see the calendar above for exact timing.
What planting zone is Portage County, WI?
Portage County, Wisconsin is in USDA Hardiness Zone 4b. The average last spring frost is May 5 and first fall frost is October 6.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Portage County gardeners in Zone 4b organize planting dates, track what's growing, and never miss a planting window.
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