Growing Radishes in Zone 3a
A complete, zone-3a timeline for Radishes — when to start, transplant, and harvest, tuned to this zone's typical frost dates (International Falls, MN; Fargo, ND).
Your planting timeline
- Direct sowonce soil warms, around May 27
- Harvestabout 22–35 days from transplant
Best varieties for zone 3a
Lean on quick, dependable salad radishes such as Cherry Belle, French Breakfast, and Easter Egg that bulk up before the short season turns hot or freezes.
Growing notes
Even, consistent moisture is the single biggest factor in good radishes. Keep the soil steadily damp — never bone-dry, never waterlogged — so the roots swell quickly and stay mild and crisp. Irregular watering, especially a drought followed by a heavy soaking, causes the roots to split or turn pithy and unpleasantly hot. In dry spring weather that usually means a thorough watering every two to three days; in cool, damp conditions rainfall may be enough. Water at the base in the morning to keep foliage dry, and mulch lightly between rows to hold moisture and even out the soil temperature.
Recommended supplies
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