Plant Eggplant in Zone 7a

Zone 7a averages 198 frost-free days, running from a last spring frost around April 10 to a first fall frost around October 25. Eggplant needs roughly 85 days from planting out to first harvest, so it uses about 43 percent of that window. Eggplant is a tender crop, which is what decides where in the window it belongs.

Because eggplant needs a head start, sow seed indoors around Feb 13, about 8 weeks ahead of the Zone 7a last frost. Transplants go out around Apr 24. Starting earlier than that in Zone 7a usually backfires: plants outgrow their cells and stall when they finally hit cold soil. At 85 days to harvest, a 198-day Zone 7a season has room for about 2 sowings, so stagger them rather than planting everything at once.

Yes. Sow eggplant by July 4 in Zone 7a. That is 113 days before the average first frost, which covers the 85 days to maturity plus about two weeks for the slower growth that comes with shortening days, plus a two week margin because frost kills eggplant outright.

Eggplant needs a long warm run to finish, so a second planting is realistic only in zone 9 and warmer.