DibbleWhen to plant collard greens 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 collard greens in Zone 3
| Task | Window |
|---|---|
| Start seeds indoors | Apr 3 to Apr 17 |
| Transplant | May 1 to May 15 |
| Estimated harvest | Jun 30 to Sep 28 |
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.
Get reminders for these exact dates
Dibble turns your ZIP code into a full planting calendar and reminds you on the right day. Free to start, no account needed.
How to grow collard greens
Start indoors 6 weeks before last frost and transplant 2 weeks before. Heat- and cold-tolerant, pick the lower leaves for months.
Companion plants
Good neighbors for Collard Greens:
Better kept apart:
Collard Greens in nearby zones
Keep exploring
Collard Greens: the full growing guide · The Zone 3 planting calendar · Every crop and zone
Plant at the right time this season
Dibble builds your calendar in under a minute. Free to start, no account needed.
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.