When to Plant Radish in Polk County, NC
Top priorities for Polk County, North Carolina gardeners in April
Your garden in Polk County, North Carolina is working on a schedule, even when you're not. Here's where you should be this April.
-
Pick radish
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
Looking ahead to May
- First harvests: radish
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.
Polk County, North Carolina is in USDA Zone 7a. The average last spring frost is April 10 and the first fall frost is October 26, giving you a growing season of approximately 199 days.
At an elevation of 2,644 feet, Polk County receives approximately 52.7 inches of rainfall annually with predominantly clay loam soil. Summer highs average 89°F, providing good warmth for Radish during the growing season. Clay soil retains moisture well for Radish, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Radish root diseases.
Polk County Soil Profile
Soil Type
Clay Loam
Soil pH
5.5-6.3
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.
Soil Compatibility in Polk County
How your county's soil matches Radish's growing requirements.
Soil pH
Your soil pH (5.5–6.3) is more acidic than Radish prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
Your soil has 31% clay, which can cause forked or stunted roots for Radish. Use raised beds with loose, sandy mix for best results.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Radish.
How to Plant Radish
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Radish
Sow every 2.4 weeks. Last sowing by Sep 21 to harvest before frost.
For a dedicated fall crop, sow by Aug 17.
Plant Water Budget
Monthly Watering Guide for Radish
Radish needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Radish Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 4.4" | 0" | ❄️ Dormant |
| Feb | — | 4.3" | 0" | ❄️ Dormant |
| Mar | — | 5.2" | 0" | ❄️ Dormant |
| Apr | 2.2" | 4" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 4.1" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 4.4" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 5.9" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 5.1" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 4.1" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.9" | 0" | ✅ Rainfall sufficient |
| Nov | — | 3.9" | 0" | ❄️ Dormant |
| Dec | — | 4.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Polk County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Radish Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Radish Planting Timeline — Polk County, NC
Radish Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | March 27 | Mar 27 – Apr 17 |
| Harvest | April 24 | Apr 24 – May 15 |
| Fall Sowing | August 17 | Aug 17 – Aug 31 |
Plant 0.5" deep · 2" apart · Rows 6" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Direct Sow |
| April | Direct Sow Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | Fall Sowing |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
22–35 days
🧪 Soil pH
Needs 6–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 7a
📆 Growing Season
199 days in Polk County
Growing Tips for Radish in Polk County
Direct sow Radish outdoors after April 10 in Polk County when soil has warmed and frost danger has passed.
With Polk County's clay soil (31% clay), work in 3-4 inches of compost before planting Radish. Avoid tilling when soil is wet to prevent compaction.
Your generous 199.0-day season in Polk County allows multiple plantings of Radish. Sow every 11.0 days for continuous harvest.
Common pests for Radish in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
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 Polk County, NC?
Polk County is in Zone 7a with an average last frost of April 10. Plan your Radish planting based on this frost date — see the calendar above for exact timing.
What planting zone is Polk County, NC?
Polk County, North Carolina is in USDA Hardiness Zone 7a. The average last spring frost is April 10 and first fall frost is October 26.
Your Polk County Garden Planner — Free
A 24-page printable planner built for Polk County (Zone 7a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.