When to plant Hyssop in Kossuth County, IA
Kossuth County sits in cold Zone 5a. Plant Hyssop May 4–May 18 for the single annual harvest; the October 6 first frost closes the window.
When to Plant Hyssop in Kossuth County, IA
Hyssop is a semi-evergreen perennial herb with intense blue flower spikes that attract bees and butterflies. It has a minty, slightly bitter flavor used in liqueurs and teas.
Kossuth County, Iowa is in USDA Zone 5a. The average last spring frost is April 27 and the first fall frost is October 6, giving you a growing season of approximately 162 days.
At an elevation of 1,213 feet, Kossuth County receives approximately 36.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 80°F, so choose short-season varieties of Hyssop to ensure they mature before fall.
Kossuth County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Hyssop Planting Timeline — Kossuth County, IA
Hyssop Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 4 | May 4 – May 18 |
| Harvest | July 13 | Jul 13 – Sep 14 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Transplant Outdoors |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–8 · Your soil: N/A
🗺️ USDA Zone
Zone 5a
📆 Growing Season
162 days in Kossuth County
Growing Tips for Kossuth County
Start seeds indoors or direct sow in spring. Prune back in early spring to encourage bushy growth. Hyssop is drought-tolerant once established and thrives in poor soil.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Hyssop in Other Locations
Frequently Asked Questions
When should I plant Hyssop in Kossuth County, IA?
Kossuth County is in Zone 5a with an average last frost of April 27. Plan your Hyssop planting based on this frost date — see the calendar above for exact timing.
What planting zone is Kossuth County, IA?
Kossuth County, Iowa is in USDA Hardiness Zone 5a. The average last spring frost is April 27 and first fall frost is October 6.
When should I plant Hyssop in Kossuth County, IA?
In Kossuth County, IA, plant Hyssop after the last frost (around April 27) and before the first frost (around October 6). Best results when soil holds above 50°F.
What growing zone is Kossuth County, IA for Hyssop?
Kossuth County sits in USDA Zone 5a. Hyssop grows reliably in zones 3a through 9b, so it's a good fit here.
Can Hyssop grow in Kossuth County's climate?
Yes — Hyssop grows well in Kossuth County's temperate climate. Kossuth County averages a 162-day frost-free season, with last frost around April 27 and first frost around October 6.
Your Kossuth County Garden Planner — Free
A 22-page printable planner built for Kossuth 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.