When to Plant Radishes in McKinney, TX
Published: April 24, 2026
Radish Planting Dates for McKinney, TX
| Start seeds indoors | Year-round |
| Last frost (average) | March 1 |
| Direct sow outdoors | January 25–February 4 |
| Minimum soil temperature | 40°F |
| Expect first harvest | February 16 – February 24 |
| Fall crop planting | October 18–28 |
| Fall crop harvest | November 9 |
| First fall frost (average) | November 22 |
⚠ 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 McKinney, TX
Consult a McKinney-area nursery or your state extension office for radish varieties proven in Zone 7b.
Growing Radishes in McKinney
McKinney sits in Zone 7b, with an average last frost of March 1 and first fall frost around November 22 — giving a 266-day frost-free growing season. Cool-season crops like radish benefit from McKinney's cooler spring and fall windows, when temperatures stay in the 55–75°F sweet spot that produces the best flavor and least bolting.
McKinney's moderate climate supports radish on the standard transplant calendar with minimal special accommodation. Succession planting — sowing fresh seeds or setting new transplants every 2–3 weeks through spring — stretches the harvest window and gives you a backup crop if pests hit the first planting.
McKinney'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 McKinney
| Month | Task |
|---|---|
| Year | Start seeds indoors under grow lights |
| March | Last frost — soil warming, prepare bed |
| January | Direct sow seeds into warm soil |
| February | Expect first harvest window to open |
| October | Start fall crop — transplants or direct sow |
| November | First fall frost — harvest remaining, end of outdoor season |
Radish Tips for McKinney 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.
- •Succession plant radish in McKinney every 2–3 weeks through spring to extend the harvest window into summer.
Common Radish Pests in McKinney
- •Flea Beetle — peaks July in Zone 7b (active May–September); tiny black beetles that riddle leaves with holes; row covers protect seedlings.
- •Cabbage Root Maggot — peaks July in Zone 7b (active May–September); monitor closely during peak season and treat early.
- •Aphid — peaks July in Zone 7b (active May–September); 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 McKinney
In McKinney's moderate 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.
Frequently Asked Questions
When should I plant radish in McKinney, TX?
In McKinney (Zone 7b), direct sow radish around January 25–February 4. Soil must be at 40°F or warmer at 2-inch depth before sowing — cold soil rots the seeds.
What zone is McKinney, TX for radish growing?
McKinney is USDA Zone 7b. For radish, this means a frost-free growing season of roughly 38 weeks running from March 1 to November 22. Cool-season crops like radish thrive in this zone with both spring and fall planting windows available.
When is radish harvest season in McKinney?
Expect the first radish harvest in McKinney around February 16, with harvest continuing through February 24. This is based on 22–30 days from transplant or direct sow. A fall crop planted October 18–28 adds a second harvest around November 9.
How long does it take to grow radish in McKinney, TX?
From transplant or direct sow to first harvest, radish takes 22–30 days in McKinney's climate. Based on a typical planting date of January 25–February 4, expect your first harvest around February 16. McKinney's Zone 7b transition-zone climate produces maturity times right in the middle of the stated range.
What soil does radish need in McKinney?
McKinney'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.