When to plant Radish in Calhoun County, IA
Calhoun County sits in USDA Zone 5a. Plant Radish between April 11 (after last frost on April 25) and May 2. A second sowing from July 28 to August 11 extends the harvest into fall.
When to Plant Radish in Calhoun 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.
Calhoun County, Iowa is in USDA Zone 5a. The average last spring frost is April 25 and the first fall frost is October 6, giving you a growing season of approximately 164 days.
At an elevation of 1,052 feet, Calhoun County receives approximately 30.1 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.
Calhoun County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Radish Planting Timeline — Calhoun County, IA
Radish Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | April 11 | Apr 11 – May 2 |
| Harvest | May 9 | May 9 – May 30 |
| Fall Sowing | July 28 | Jul 28 – Aug 11 |
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 | — |
| 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
164 days in Calhoun County
Growing Tips for Calhoun 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 Calhoun County, IA?
Calhoun County is in Zone 5a with an average last frost of April 25. Plan your Radish planting based on this frost date — see the calendar above for exact timing.
What planting zone is Calhoun County, IA?
Calhoun County, Iowa is in USDA Hardiness Zone 5a. The average last spring frost is April 25 and first fall frost is October 6.
When should I plant Radish in Calhoun County, IA?
In Calhoun County, IA, plant Radish after the last frost (around April 25) and before the first frost (around October 6). Best results when soil holds above 50°F.
What growing zone is Calhoun County, IA for Radish?
Calhoun 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 Calhoun County's climate?
Yes — Radish grows well in Calhoun County's temperate climate. Calhoun County averages a 164-day frost-free season, with last frost around April 25 and first frost around October 6.
Your Calhoun County Garden Planner — Free
A 22-page printable planner built for Calhoun 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.