When to plant Radish in Allamakee County, IA
Aim to plant Radish in Allamakee County on or after April 18; the window stays open through May 9. Allamakee County's 158-day frost-free season gives you a single solid spring crop with a brief fall option. A second sowing from July 29 to August 12 extends the harvest into fall.
When to Plant Radish in Allamakee County, IA
Radishes are one of the fastest-growing vegetables, with some varieties ready in under a month. They come in round, elongated, and large winter types.
Allamakee County, Iowa is in USDA Zone 5a. The average last spring frost is May 2 and the first fall frost is October 7, giving you a growing season of approximately 158 days.
At an elevation of 804 feet, Allamakee County receives approximately 39.9 inches of rainfall annually with predominantly silt loam soil. Summer highs average 82°F, so choose short-season varieties of Radish to ensure they mature before fall.
Allamakee County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Radish Planting Timeline — Allamakee County, IA
Radish Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | April 18 | Apr 18 – May 9 |
| Harvest | May 16 | May 16 – Jun 6 |
| Fall Sowing | July 29 | Jul 29 – Aug 12 |
Plant 0.5" deep · 2" apart · Rows 6" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Direct Sow |
| May | Direct Sow Harvest |
| June | Harvest |
| July | Fall Sowing |
| August | Fall Sowing |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
22–35 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 5a
📆 Growing Season
158 days in Allamakee County
Growing Tips for Allamakee County
Direct sow every 1-2 weeks for continuous harvest. Do not transplant. Harvest spring radishes promptly to prevent them from becoming pithy and hot.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Radish in Other Locations
Frequently Asked Questions
When should I plant Radish in Allamakee County, IA?
Allamakee County is in Zone 5a with an average last frost of May 2. Plan your Radish planting based on this frost date — see the calendar above for exact timing.
What planting zone is Allamakee County, IA?
Allamakee County, Iowa is in USDA Hardiness Zone 5a. The average last spring frost is May 2 and first fall frost is October 7.
When should I plant Radish in Allamakee County, IA?
In Allamakee County, IA, plant Radish after the last frost (around May 2) and before the first frost (around October 7). Best results when soil holds above 50°F.
What growing zone is Allamakee County, IA for Radish?
Allamakee County sits in USDA Zone 5a. Radish grows reliably in zones 2a through 11b, so it's a good fit here.
Can Radish grow in Allamakee County's climate?
Yes — Radish grows well in Allamakee County's temperate climate. Allamakee County averages a 158-day frost-free season, with last frost around May 2 and first frost around October 7.
Your Allamakee County Garden Planner — Free
A 22-page printable planner built for Allamakee 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.