DibbleWhen to plant basil 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 basil in Zone 3
| Task | Window |
|---|---|
| Start seeds indoors | Apr 17 to May 1 |
| Transplant | May 22 to Jun 5 |
| Estimated harvest | Jul 21 to Oct 19 |
The harvest estimate counts 60 days to maturity, then a picking window of about 90 days. These windows use typical frost dates for Zone 3; Dibble pins them to your exact ZIP code.
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Basil in a Zone 3 season
Zone 3 gives about 123 frost-free days. Basil needs roughly 60 days from transplant. That leaves about 63 days of slack, so there is room for a late start or a second planting.
How to grow basil
Start basil indoors 4 weeks before last frost; it hates cold, so transplant after frost. Pinch tops to keep it bushy.
Companion plants
Good neighbors for Basil:
Basil in other zones
Not in Zone 3? Pick your zone for the same dated windows.
Keep exploring
Basil: 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.