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Radishes are cool-season vegetables that grow best in USDA Hardiness Zones 2–10, making them suitable for most of the continental U.S. They’re fast-growing, hardy, and can be planted multiple times per year depending on your zone.
Recommended Growing Zones for Radishes: USDA Zones 2–10
Radishes thrive in cool weather—spring and fall are ideal. Here’s how that translates across U.S. states:
| USDA Zone | State Examples | Best Planting Time |
| Zone 2–4 | Northern Minnesota, North Dakota, parts of Montana | Late spring & early fall (shorter growing window) |
| Zone 5–7 | Pennsylvania, Illinois, Missouri, New York | Early spring & fall (ideal zones) |
| Zone 8–10 | Texas, Florida (northern), California (coastal/inland) | Late fall to early spring (too hot in summer) |
Can You Grow Radishes Indoors?
Yes, radishes can be grown indoors, especially the smaller, quick-maturing varieties like:
- Cherry Belle
- French Breakfast
- White Icicle
Requirements for Indoor Growing:
- Container depth: At least 6 inches deep
- Light: 6+ hours of sunlight or a grow light
- Temperature: 50–70°F (10–21°C)
- Soil: Loose, well-drained potting mix
- Water: Keep soil consistently moist (not soggy)
Tips for Success:
- Sow radish seeds directly where they’ll grow – they don’t transplant well.
- Harvest in 3–5 weeks depending on variety – don’t let them over-mature or they’ll get woody/spicy.
- For indoor growing, rotate pots or use a full-spectrum LED grow light to prevent leggy growth.
Check out the USDA Plant Hardiness Zone Map and find out what zone your zip code is located in here. Or you can use our map to get a general idea of what your plant hardiness zone is.
Remember to adjust your growing practices based on your specific climate and zone.
Happy gardening!
