DibbleWhen to plant fennel 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 fennel in Zone 3
| Task | Window |
|---|---|
| Direct sow | May 1 to May 15 |
| Estimated harvest | Jul 20 to Aug 10 |
The harvest estimate counts 80 days to maturity, then a picking window of about 21 days. These windows use typical frost dates for Zone 3; Dibble pins them to your exact ZIP code.
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Fennel in a Zone 3 season
Zone 3 gives about 123 frost-free days. Fennel needs roughly 80 days from sowing. That leaves about 43 days of slack, enough for one full crop with a little room for a cold spring.
How to grow fennel
Sow bulb fennel a couple of weeks before last frost. Keep it cool and moist, and mound soil around the swelling bulb to blanch it.
Fennel in other zones
Not in Zone 3? Pick your zone for the same dated windows.
Keep exploring
Fennel: 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.