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Vegetable Crop Calendars (A–C)Eggplant Planting Calendar: Start Indoors
Eggplant wants heat more than almost any other garden vegetable, which is why the schedule starts on a windowsill long before the garden is ready.
Key points
- Start eggplant indoors for transplanting after last frost.
- Count backward using your guide's seedling weeks.
- Keep seedlings warm and well lit.
- Plant out only when nights are warm.
- Rotate away from other nightshades.
Why start eggplant indoors?
Eggplant seed germinates slowly and needs warmth, and the plants grow slowly for the first weeks. In most of the country the outdoor season is too short to seed directly, so growers raise transplants indoors and plant them out when the weather has settled.
Extension guides from several states recommend starting seed indoors for a set number of weeks before transplanting. The number differs by source, so use your state guide.
Choose varieties by days to maturity, since a faster type is a safer choice if your season is short or your spring is cool. Extension variety trials, where published, offer neutral comparisons.
How do you count backward from your last frost?
Begin with your average last spring frost date. Eggplant is set out after that date, often a week or two later, once nights are reliably warm. Subtract the number of weeks your guide gives for growing transplants, and that is your seed-starting date.
For example, if your last frost usually falls in mid-spring and your guide recommends starting seed about two months before transplanting, you would sow in late winter. That example is only a way to show the arithmetic. Use your own numbers.
Write both dates on a calendar, and add a buffer in case spring is late. Some gardeners start a few extra seedlings as insurance. If a few stall or fail, you still have enough healthy plants for the bed.
- Find your average last spring frost.
- Add a week or two for warm nights.
- Subtract your guide's seedling weeks.
- Start seed on that date with a heat source.
What conditions do seedlings need?
Warm soil speeds germination, and many growers use a heat mat under seed trays. Once seedlings emerge, provide strong light, since weak light produces tall, floppy plants. Keep the medium damp but not soggy.
Pot seedlings up when they have a couple of true leaves, and avoid letting them dry out or become root-bound. Seedlings that stall from cold or crowding often take weeks to recover.
Harden seedlings off by giving them outdoor exposure gradually over about a week. Do not rush transplants because they look ready. A plant that is the right size but meets cold ground will sit still, while a slightly younger plant set out into warm soil often overtakes it within a couple of weeks. When in doubt, wait.
When do you plant out?
Wait until the soil is warm and nights stay mild. Cold nights stunt eggplant and can cause flower drop later. Black plastic mulch or row cover can warm the soil, and many gardeners use them for earlier or more reliable plantings.
Set plants at the depth they grew in their pots, and water them in. Stake or cage plants, since fruit can be heavy.
If a cold snap follows planting, cover plants overnight and remove the cover in the morning. A short chill is easier to recover from than a long one.
What care keeps plants producing?
Eggplant likes full sun, fertile soil and steady water. A soil test tells you what the bed needs, and your extension office can help interpret it. Nutrient management rules vary by state, so follow local recommendations.
Mulch holds moisture and reduces weeds. Pick fruit while the skin is glossy and the flesh is firm, because overripe fruit turns dull, seedy and bitter.
Keep records on the first harvest date each year. Over a few seasons you will see how much weather shifts it, and you can adjust your start date. Side-dress timing and amounts come from your soil test and local guide, so ask your extension office rather than applying on a hunch. Overfeeding with nitrogen gives leafy plants with few fruit.
What pests and problems should you expect?
Flea beetles often chew small holes in young leaves, and Colorado potato beetles, aphids and spider mites also occur. Row cover at planting protects young plants, and regular scouting catches problems early. Rotation away from tomatoes, peppers and potatoes lowers disease pressure.
If a pesticide is ever considered, read the label, observe the pre-harvest interval, protect pollinators and check licensing rules. Ask your extension office what is active in your area.
Remove spent plants at season's end and avoid composting any with obvious disease, so the next planting starts clean.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.