DibbleWhen to plant radishes in Zone 3
In Zone 3, the last spring frost usually passes around May 15 and the first fall frost arrives around September 15, leaving about 123 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Short, cool season. Start most warm crops indoors and protect from late frosts.
Planting windows for radishes in Zone 3
| Task | Window |
|---|---|
| Direct sow | Apr 17 to May 1 |
| Estimated harvest | May 15 to May 25 |
The harvest estimate counts 28 days to maturity, then a picking window of about 10 days. These windows use typical frost dates for Zone 3; Dibble pins them to your exact ZIP code.
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Radish in a Zone 3 season
Zone 3 gives about 123 frost-free days. Radish needs roughly 28 days from sowing. That leaves about 95 days of slack, so there is room for a late start or a second planting.
Sowing every 10 days, Zone 3 has room for about 10 plantings.
How to grow radishes
The fastest crop, ready in about a month. Sow 4 weeks before last frost and every 10 days while it's cool.
Companion plants
Good neighbors for Radish:
Radish in other zones
Not in Zone 3? Pick your zone for the same dated windows.
Keep exploring
Radish: the full growing guide · The Zone 3 planting calendar · Every crop and zone
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.