When to Plant Radishes in Missouri
Published: April 24, 2026
Missouri gardeners in Zone 6b have a 33-week growing season for radish (March 22 to November 10). Missouri's spring and fall windows both work well for radish — some gardeners plant both successions for a long harvest. This guide gives exact dates for Missouri based on your local frost calendar.
Radish Planting Dates for Missouri
| Start seeds indoors | Year-round |
| Last frost (average) | March 22 |
| Direct sow outdoors | February 15–25 |
| Expect first harvest | March 9 – March 17 |
| Fall crop start | October 6–16 |
| Fall harvest | October 28 |
| First fall frost (average) | November 10 |
Dates above assume Zone 6b, the most common zone in Missouri. Gardeners in cooler St. Louis (Zone 6b) plant 1–2 weeks later; warmer Kansas City (Zone 6a) can plant 1–2 weeks earlier.
⚠ 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.
Growing Radishes in Missouri's Climate
Missouri's moderate Zone 6b climate is well-suited to radish with minimal special accommodation. The standard transplant calendar works as written, and harvest windows line up with what seed packets recommend without adjustment.
Succession planting extends your radish harvest significantly in Missouri. A second planting 3 to 4 weeks after the first gives you a backup in case of pest pressure and extends the total harvest window into early fall.
Common radish pests to watch for in Missouri include Flea Beetle and Cabbage Root Maggot. The first line of defense is companion planting: Lettuce and Carrot planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Radish Garden Calendar for Missouri
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | Direct sow seeds | Sow seeds 1/4–1/2 inch deep, 2 inches apart |
| March | First harvest window opens | Radish begins producing 22–30 days after transplant |
| April | — | Dormant season |
| May ← | Watch for bolting | Harvest promptly; spring heat arrives quickly |
| June | — | Dormant season |
| July | — | Dormant season |
| August | — | Dormant season |
| September | — | Dormant season |
| October | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| November | First frost approaches | Harvest remaining radish; cover plants on frost nights |
| December | — | Dormant season |
Radish Growing Tips for Missouri 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.
- •Missouri's moderate climate supports succession planting — sow new transplants or seeds every 3 weeks during spring to extend the harvest window into fall.
- •Plant as a row marker for slow-germinating crops like carrots — radishes sprout in days and mark the rows.
Companion Planting for Radishes in Missouri
In Missouri's moderate climate, planting radish with Lettuce and Carrot helps deter pests and improve soil. Avoid planting near Hyssop and Grape, which inhibit radish growth through root chemistry or shared pest pressure. See the full radish companion planting guide for the complete list.
Radishes Planting Dates by City in Missouri
Top cities in Missouri — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant radish in Missouri?
In Missouri (Zone 6b), start radish seeds indoors around Year-round and transplant outdoors around null — 0 weeks after the state's average last frost of March 22.
What is the last frost date in Missouri?
Missouri's average last frost date is March 22 in the state's most common Zone 6b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow radish year-round in Missouri?
radish is a cool-season crop in Missouri, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What radish varieties grow best in Missouri?
For Missouri's Zone 6b, consult a local nursery or extension office for radishes variety recommendations.
When do I start radish seeds indoors in Missouri?
Radish does not need indoor starting in Missouri — direct sow around February 15–25 once soil reaches 40°F. Indoor starting is not recommended for this crop because radish transplants poorly.