Eggplant in Zone 4a & 4b
Solanum melongena
Yes, eggplant grows in zones 4a and 4b. Start seeds indoors Mar 20–Mar 27 and plant out May 29–Jun 5.
When to plant eggplant in zone 4b
Zones 4a and 4b share the same average frost dates, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. It 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.
Plant alongside it in zone 4b
These go outside within two weeks of eggplant in zone 4b, so one planting day can cover them.
- TomatoMay 29–Jun 5
- Sweet CornMay 22–May 29
- CucumberMay 22–May 29
- ZucchiniMay 22–May 29
- Winter SquashMay 22–May 29
- BroccoliniMay 15–May 22
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.
Eggplant planting windows in every zone
Zone 4b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 4a & 4b (your zone) | Mar 20–Mar 27 | May 29–Jun 5 | Aug 12–Aug 19 |
| 5a & 5b | Mar 15–Mar 22 | May 24–May 31 | Aug 7–Aug 14 |
| 6a & 6b | Feb 28–Mar 7 | May 9–May 16 | Jul 23–Jul 30 |
| 7a & 7b | Feb 13–Feb 20 | Apr 24–May 1 | Jul 8–Jul 15 |
| 8a & 8b | Jan 28–Feb 4 | Apr 8–Apr 15 | Jun 22–Jun 29 |
| 9a & 9b | Dec 21–Dec 28 | Mar 1–Mar 8 | May 15–May 22 |
| 10a & 10bSpring window | Dec–Feb | Mar–Apr | ~75 days after transplanting |
| Summer window | May–Jul | Jul–Sep | ~75 days after transplanting |
| 11a & 11bSummer window | Jun–Dec | Aug–Feb | ~75 days after transplanting |
Harvest dates are about 75 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
- Bush Beans: Beans fix nitrogen that heavy-feeding eggplant uses.
- Bell Pepper: Same nightshade family, same care routine, easy to bed together.
Where to buy eggplant seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's eggplant seeds)
Varieties we recommend, and where to get them:
- Black Beauty: The classic Iowa State Extension names alongside Cloud Nine: oval, 6-7 inches long, purple-black. Buy: Botanical Interests · Burpee · High Mowing Organic Seeds Full notes
See why we recommend these suppliers →
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a clear consensus of positive, independent reviews, or ones we bought and use ourselves. Each item on our gear page says which.
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 · Plan your beds in the Garden Designer →
Pin this for later
Growing Eggplant in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
Save to Pinterest