Eggplant in Zone 4a & 4b
Solanum melongena
When to plant eggplant in zone 4b
Zones 4a and 4b share the same average frost dates in our data, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. Eggplant needs a head start most zones can't give it by direct-sowing alone.
| Start indoors | Mar 20–Mar 27 |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated harvest | Aug 12–Aug 19 (~75 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Eggplant is a slow, deliberate grower. It needs a longer head start indoors than tomatoes or peppers, and it won't hurry once it's in the ground either. The payoff is a long, steady harvest of glossy fruit through the hottest part of summer, once the plant finally gets going.
How eggplant fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Eggplant needs about 75 days from transplant to first harvest.
Good companions
- Bush Beans: Beans fix nitrogen that heavy-feeding eggplant uses.
- Pepper: Same nightshade family, same care routine, easy to bed together.
Where to buy eggplant seeds
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing eggplant" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Full companion planting guide · Full plant profile · Plan your beds in the Garden Designer →
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Growing Eggplant in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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