When to Plant Radishes in Killeen, TX
Published: April 24, 2026
Radish Planting Dates for Killeen, TX
| Start seeds indoors | Year-round |
| Last frost (average) | February 1 |
| Direct sow outdoors | December 28–January 7 |
| Minimum soil temperature | 40°F |
| Expect first harvest | January 19 – January 27 |
| Fall crop planting | November 10–20 |
| Fall crop harvest | December 2 |
| First fall frost (average) | December 15 |
⚠ Direct sow radishes 4–6 weeks before last frost — one of the fastest crops in the garden. Ready in as little as 22 days. Succession plant every 2 weeks for continuous harvest.
Best Radish Varieties for Killeen, TX
Consult a Killeen-area nursery or your state extension office for radish varieties proven in Zone 8b.
Growing Radishes in Killeen
Killeen sits in Zone 8b, with an average last frost of February 1 and first fall frost around December 15 — giving a 317-day frost-free growing season. Cool-season crops like radish benefit from Killeen's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
In Killeen's warm climate, radish works best as a fall, winter, and early-spring crop. Summer heat bolts most cool-season vegetables before they can produce a harvestable head or root. Plan primary plantings in October through February in Killeen, not April through June.
Killeen's heavy clay soil benefits from raised beds or deep organic matter amendment before planting radish. Clay retains moisture well but compacts easily — add 3 to 4 inches of compost and work it in to 12 inches before planting. Consistent watering (1 inches per week) is especially important in clay soil, which can crack and pull away from roots during dry spells; mulch around plants to stabilize moisture.
Radish Calendar for Killeen
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| February | Last frost — soil warming, prepare bed |
| December | Direct sow seeds into warm soil |
| January | Expect first harvest window to open |
| November | Start fall crop — transplants or direct sow |
| December | First fall frost — harvest remaining, end of outdoor season |
Radish Tips for Killeen Gardeners
- •Thin to 2-inch spacing when seedlings are an inch tall — crowded radishes produce small woody roots.
- •Succession plant every 10–14 days from early spring through late spring for continuous harvest.
- •Plant cool-season radish in Killeen during October through February — spring plantings bolt before producing a usable crop in warm zones.
Common Radish Pests in Killeen
- •Flea Beetle — peaks June–August in Zone 8b (active March–October); tiny black beetles that riddle leaves with holes; row covers protect seedlings.
- •Cabbage Root Maggot — peaks June–August in Zone 8b (active March–October); monitor closely during peak season and treat early.
- •Aphid — peaks June–August in Zone 8b (active March–October); monitor closely during peak season and treat early.
Check plants every 2–3 days during peak season — early intervention prevents most infestations from becoming serious.
What to Plant with Radishes in Killeen
In Killeen's warm climate, Lettuce and Carrot are the most beneficial plants to grow alongside radish. Lettuce improves nearby plant health and pest resistance. Keep radish away from Hyssop — it competes for nutrients or shares pest pressure. Warm-climate gardeners especially benefit from dense, layered companion plantings that shade soil and reduce water loss.
Frequently Asked Questions
When should I plant radish in Killeen, TX?
In Killeen (Zone 8b), direct sow radish around December 28–January 7. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is Killeen, TX for radish growing?
Killeen is USDA Zone 8b. For radish, this means a frost-free growing season of roughly 45 weeks running from February 1 to December 15. Cool-season crops like radish thrive in this zone with both spring and fall planting windows available.
When is radish harvest season in Killeen?
Expect the first radish harvest in Killeen around January 19, with harvest continuing through January 27. This is based on 22–30 days from transplant or direct sow. A fall crop planted November 10–20 adds a second harvest around December 2.
How long does it take to grow radish in Killeen, TX?
From transplant or direct sow to first harvest, radish takes 22–30 days in Killeen's climate. Based on a typical planting date of December 28–January 7, expect your first harvest around January 19. Killeen's warm Zone 8b climate tends toward the faster end of this range — warmer soil and longer days accelerate maturity.
What soil does radish need in Killeen?
Killeen's heavy clay soil compacts easily and drains slowly — problematic for radish which needs oxygenated roots. Build a raised bed or amend deeply with 3–4 inches of compost worked into the top 12 inches. Add gypsum if the soil is severely compacted. Consistent watering matters especially in clay because the soil can crack and pull away from roots during dry spells.