When to plant eggplants in Trenton: 21 May – 23 July

In Trenton, eggplant: sow for seedlings from 1 March to 24 May; plant into a greenhouse from 30 April to 23 July; plant out into open ground from 21 May to 23 July.

Eggplant in Trenton: soil, season and weather

In Trenton the soil, not frost, sets the date: the last frost is over around 6 April, but the top 7 cm of soil reaches 18 °C — the minimum on the eggplant card — only around 21 May, 45 days later.

Last spring frost	6 April
Top 7 cm of soil at 18 °C	21 May, 45 days after the last frost
Into an unheated greenhouse	30 April – 23 July; April outside: 6.3 °C at night, 17.2 °C by day; card 21–29 °C
First autumn frost	12 November, 175 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	30 July – 1 October
Days left for picking	105
Daylight	12:12 on 22 March, 14:34 on 21 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 8 rainy days

The same dates in Trenton hold for Cucumber, Bell Pepper, Zucchini, Pumpkin and Watermelon.

Eggplant in Trenton: care after planting

Planted on 21 May: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

21 May — feed: balanced (NPK)
18 June — feed: nitrogen

Pests and diseases of eggplant to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Trenton during the eggplant season

Days average above the eggplant card's 21–29 °C in July (31 °C) and August (29.3 °C). Months that stay below 21 °C even by day on average: October (19.9 °C) and November (12.8 °C). Nights average below 21 °C in every month of the season, from 3.8 °C to 20.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	22.3	11.7	128	13	14:23
June	27.9	17	98	12	15:01
July	31	20.8	135	14	14:46
August	29.3	19.7	117	12	13:48
September	25.8	16.4	109	10	12:30
October	19.9	10.6	96	10	11:11
November	12.8	3.8	79	8	9:59

ERA5 2016–2025, Open-Meteo

Eggplant in nearby cities

Around Trenton, Atlantic City is 16 days earlier and Harrisburg 4 days later.

City	Distance	Date	Difference
Philadelphia	45 km	14 May – 22 July	7 days earlier
Allentown	73 km	23 May – 14 July	2 days later
New York	84 km	21 May – 31 July	same day
Atlantic City	100 km	5 May – 2 August	16 days earlier
Dover	134 km	11 May – 6 August	10 days earlier
Harrisburg	179 km	25 May – 22 July	4 days later

Where to buy eggplant plants and seeds near Trenton

Buy plants ready to set out from 21 May to 23 July (from 30 April to 23 July for an unheated greenhouse); seed for raising your own is sown from 1 March to 24 May. Within 15 km of Trenton OpenStreetMap lists 6 garden centres, 1 farm-supply shop, 3 plant nurseries, 5 markets and 3 farm shops (collected 28 October 2026).

Willis Greenhouses — plant nursery
6 km
Jug Hill Christmas Tree Farm — plant nursery
9 km
Colavita Christmas Tree Farm — plant nursery
11 km
Newtown Farmer's Market — market
15 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

Questions