When to plant tomatoes in Trenton: 3 May – 23 July

In Trenton, tomato: sow for seedlings from 19 February to 1 June; plant into a greenhouse from 12 April to 23 July; plant out into open ground from 3 May to 23 July. For plants and seeds, the places nearby include Trenton Organics (garden centre, 4 km) and Longford Garden Center (garden centre, 5 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 3 May, 27 days later.

Last spring frost	6 April
Top 7 cm of soil at 15 °C	3 May, 27 days after the last frost
Into an unheated greenhouse	12 April – 23 July; April outside: 6.3 °C at night, 17.2 °C by day; card 16–27 °C
First autumn frost	12 November, 193 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	12 July – 1 October
Days left for picking	123
Daylight	11:46 on 12 March, 13:58 on 3 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 8 rainy days

Tomato in Trenton: care after planting

Planted on 3 May: in the first weeks water every 4 days.

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

3 May — feed: balanced (NPK)
31 May — feed: nitrogen

Pests and diseases of tomato 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 tomato season

Days average above the tomato card's 16–27 °C in June (27.9 °C), July (31 °C) and August (29.3 °C). Months that stay below 16 °C even by day on average: November (12.8 °C). Nights average below 16 °C in May (11.7 °C), October (10.6 °C) and November (3.8 °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

Tomato in nearby cities

3 of the nearest cities share Trenton's date.

City	Distance	Date	Difference
Philadelphia	45 km	29 April – 22 July	4 days earlier
Allentown	73 km	3 May – 14 July	same day
New York	84 km	3 May – 31 July	same day
Atlantic City	100 km	24 April – 2 August	9 days earlier
Dover	134 km	17 April – 6 August	16 days earlier
Harrisburg	179 km	3 May – 22 July	same day

Where to buy tomato plants and seeds near Trenton

Buy plants ready to set out from 3 May to 23 July (from 12 April to 23 July for an unheated greenhouse); seed for raising your own is sown from 19 February to 1 June. 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).

Kale's Nursery and Landscape Service — garden centre
Mon–Sat 09:00–17:00; Sun 10:00–16:00; Tue closed · 13 km · kalesnursery.com
Trenton Organics — garden centre
Lamberton Road 1500, 08611 Trenton · 4 km
Longford Garden Center — garden centre
Kuser Road 947, 08619 Hamilton · 5 km
Rosedale Town & Country — farm supply
Route 31 North 101, 08534 Pennington · Mon–Fri 08:00–18:00; Sat 08:00–17:00; Sun 09:00–16:00 · 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