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Radish Growing Guide
Brassica family
Days to Harvest25 days
SunlightFull Sun
Frost ToleranceLight
Spacing16/sqft (3" apart)
Germination3-7 days
HardinessSemi Hardy
Germ. Temp65°F
Companion Planting
Avoid Planting Near
HyssopGrowth Stages
- Seedling
- Early Vegetative
- Late Vegetative / Harvest Ready
Planting Dates by Zone
| Zone | Start Indoors | Transplant | Direct Sow | Harvest |
|---|---|---|---|---|
| Zone 1a | — | — | Apr 20 | May 15 |
| Zone 1b | — | — | Apr 20 | May 15 |
| Zone 2a | — | — | Apr 10 | May 5 |
| Zone 2b | — | — | Apr 20 | May 15 |
| Zone 3a | — | — | Apr 17 | May 12 |
| Zone 3b | — | — | Apr 10 | May 5 |
| Zone 4a | — | — | Mar 31 | Apr 25 |
| Zone 4b | — | — | Mar 27 | Apr 21 |
| Zone 5a | — | — | Mar 24 | Apr 18 |
| Zone 5b | — | — | Mar 24 | Apr 18 |
| Zone 6a | — | — | Mar 24 | Apr 18 |
| Zone 6b | — | — | Mar 11 | Apr 5 |
| Zone 7a | — | — | Mar 11 | Apr 5 |
| Zone 7b | — | — | Mar 6 | Mar 31 |
| Zone 8a | — | — | Mar 1 | Mar 26 |
| Zone 8b | — | — | Feb 15 | Mar 12 |
| Zone 9a | — | — | Feb 13 | Mar 10 |
| Zone 9b | — | — | Feb 3 | Feb 28 |
| Zone 10a | — | — | Jan 16 | Feb 10 |
| Zone 10b | — | — | Dec 24 | Jan 18 |
| Zone 11a | — | — | Dec 24 | Jan 18 |
| Zone 11b | — | — | Dec 11 | Jan 5 |
| Zone 12a | — | — | Nov 27 | Dec 22 |
| Zone 12b | — | — | Nov 27 | Dec 22 |
| Zone 13a | — | — | Nov 27 | Dec 22 |
| Zone 13b | — | — | Nov 27 | Dec 22 |
Frequently Asked Questions
How long does it take to grow Radish?
Radish takes approximately 25 days from planting to harvest.
How much sun does Radish need?
Radish requires full sun (6+ hours direct sunlight per day).
How far apart should I plant Radish?
Plant Radish at 16/sqft (3" apart) using square foot gardening spacing.
Can Radish survive frost?
Radish is tolerant of light frost.
What are good companion plants for Radish?
Good companion plants for Radish include Nasturtiums, Spinach, Lettuce, Peas. Avoid planting near Hyssop.
How long does Radish take to germinate?
Radish seeds germinate in 3-7 days at an optimal temperature of 65°F.
Growing Tips
- Direct sow every 1-2 weeks from early spring through fall
- Thin to 2 inches apart for well-formed roots
- Hot weather makes radishes pithy and extra pungent
Common Pests & Diseases
- Flea beetles
- Cabbage root maggot
- Aphids
Harvest Notes
Pull when roots are visible at the soil surface and 1 inch in diameter. Do not leave in ground too long or they become woody and hollow.
Plan Your Radish Garden
Track Radish from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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