DibbleWhen to plant broccoli 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 broccoli in Zone 3
| Task | Window |
|---|---|
| Start seeds indoors | Apr 3 to Apr 17 |
| Transplant | May 1 to May 15 |
| Estimated harvest | Jul 5 to Jul 26 |
The harvest estimate counts 65 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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How to grow broccoli
Start indoors 6 weeks before last frost; transplant 2 weeks before. Cut the central head, then enjoy side shoots for weeks.
Companion plants
Good neighbors for Broccoli:
Better kept apart:
Broccoli in nearby zones
Keep exploring
Broccoli: 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.