When to plant tomatoes in Hartford: 19 May – 19 July

In Hartford, tomato: sow for seedlings from 7 March to 28 May; plant into a greenhouse from 28 April to 19 July; plant out into open ground from 19 May to 19 July. For plants and seeds, the places nearby include General Landscaping (garden centre, 10 km) and Stonehedge Landscaping and Garden Center (garden centre, 11 km); addresses and opening hours are below.

Tomato in Hartford: soil, season and weather

In Hartford the soil, not frost, sets the date: the last frost is over around 13 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 19 May, 36 days later.

Last spring frost	13 April
Top 7 cm of soil at 15 °C	19 May, 36 days after the last frost
Into an unheated greenhouse	28 April – 19 July; April outside: 4.1 °C at night, 15 °C by day; card 16–27 °C
First autumn frost	8 November, 173 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	28 July – 27 September
Days left for picking	103
Daylight	12:30 on 28 March, 14:39 on 19 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, June, has 12 rainy days

Tomato in Hartford: care after planting

Planted on 19 May: in the first weeks water every 4 days.

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

19 May — feed: balanced (NPK)
16 June — 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 Hartford during the tomato season

Days average above the tomato card's 16–27 °C in July (29.5 °C) and August (28.1 °C). Months that stay below 16 °C even by day on average: November (10.8 °C). Nights average below 16 °C in May, June and September–November (1.9–15.2 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.8	9.9	114	13	14:31
June	26.5	15.2	82	12	15:12
July	29.5	19	141	14	14:56
August	28.1	18.1	95	11	13:54
September	24.1	14.5	127	9	12:32
October	18.1	8.9	126	11	11:08
November	10.8	1.9	82	9	9:51

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Hartford, New York is 16 days earlier and Worcester (United States) 1 day later.

City	Distance	Date	Difference
New Haven	54 km	17 May – 23 July	2 days earlier
Worcester (United States)	93 km	20 May – 19 July	1 day later
Providence	106 km	17 May – 19 July	2 days earlier
Albany	133 km	19 May – 17 July	same day
Boston	150 km	19 May – 24 July	same day
New York	161 km	3 May – 31 July	16 days earlier

Where to buy tomato plants and seeds near Hartford

Buy plants ready to set out from 19 May to 19 July (from 28 April to 19 July for an unheated greenhouse); seed for raising your own is sown from 7 March to 28 May. Within 15 km of Hartford OpenStreetMap lists 10 garden centres, 1 farm-supply shop, 1 plant nursery, 5 markets and 11 farm shops (collected 20 October 2026).

Stonehedge Landscaping and Garden Center — garden centre
Willard Avenue 1616, 06111 Newington · Mon–Sun 09:00–19:00 · 11 km · stonehedgelandscapingco.com
General Landscaping — garden centre
Kreiger Lane 100, 06033 Glastonbury · 10 km · generallandscaping.com
S.A. Frink Garden Center — garden centre
Pane Road 67, 06111 Newington · 12 km
Niro Garden Center — garden centre
Kelsey Street 230, 06111 Newington · 13 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.

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