When to Plant Radish in Hillsborough County, FL
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.
Hillsborough County, Florida is in USDA Zone 9b. The average last spring frost is January 25 and the first fall frost is December 20, giving you a growing season of approximately 329 days.
At an elevation of 63 feet, Hillsborough County receives approximately 54.4 inches of rainfall annually with predominantly sand soil. Summer highs average 98°F, so Radish may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Radish will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Radish root diseases.
Hillsborough County Soil Profile
Soil Type
Sand
Soil pH
4.9-5.9
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
Radish Planting Timeline — Hillsborough County, FL
Radish Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | January 4 | Jan 4 – Jan 25 |
| Fall Sowing | October 25 | Oct 25 – Nov 8 |
| Harvest | February 1 | Feb 1 – Feb 22 |
Plant 0.5" deep · 2" apart · Rows 6" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Direct Sow |
| February | Harvest |
| March | — |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | Fall Sowing |
| December | — |
Growing Conditions
Sun
Full Sun (6-8+ hours)
Water
Moderate — regular watering
Days to Maturity
22–35 days
Soil pH
6 – 7
USDA Zone
Zone 9b
Growing Season
329 days
Growing Tips for Hillsborough 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
Level Up Your Garden
Radish in Other Locations
Frequently Asked Questions
When should I plant Radish in Hillsborough County, FL?
Hillsborough County is in Zone 9b with an average last frost of January 25. Plan your Radish planting based on this frost date — see the calendar above for exact timing.
What planting zone is Hillsborough County, FL?
Hillsborough County, Florida is in USDA Hardiness Zone 9b. The average last spring frost is January 25 and first fall frost is December 20.
Plan Your Garden with Confidence
Get our free Garden Planner — designed to help Hillsborough County gardeners in Zone 9b organize planting dates, track what's growing, and never miss a planting window.
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