DibbleWhen to plant borage 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 borage in Zone 3
| Task | Window |
|---|---|
| Direct sow | May 15 to May 29 |
| Estimated harvest | Jul 9 to Oct 7 |
The harvest estimate counts 55 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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How to grow borage
Direct sow around last frost, borage resents transplanting and self-sows freely. A pollinator magnet with edible blue flowers.
Companion plants
Good neighbors for Borage:
Borage in nearby zones
Keep exploring
Borage: the full growing guide · The Zone 3 planting calendar · Every crop and zone
Plant at the right time this season
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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.