When to plant tomatoes in Manchester (United States): 20 May – 13 July

In Manchester (United States), tomato: sow for seedlings from 8 March to 22 May; plant into a greenhouse from 29 April to 13 July; plant out into open ground from 20 May to 13 July. For plants and seeds, the places nearby include Giant Landscaping Materials (garden centre, 3 km) and Demers Garden Center (garden centre, 6 km); addresses and opening hours are below.

Tomato in Manchester (United States): soil, season and weather

In Manchester (United States) the soil, not frost, sets the date: the last frost is over around 22 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 20 May, 28 days later.

Last spring frost	22 April
Top 7 cm of soil at 15 °C	20 May, 28 days after the last frost
Into an unheated greenhouse	29 April – 13 July; April outside: 2.8 °C at night, 13.3 °C by day; card 16–27 °C
First autumn frost	2 November, 166 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	29 July – 21 September
Days left for picking	96
Daylight	12:34 on 29 March, 14:48 on 20 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, November, has 9 rainy days

Tomato in Manchester (United States): care after planting

Planted on 20 May: in the first weeks water every 4 days.

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

20 May — feed: balanced (NPK)
17 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 Manchester (United States) during the tomato season

Days average above the tomato card's 16–27 °C in July (28.9 °C) and August (27.4 °C). Months that stay below 16 °C even by day on average: November (8.9 °C). Nights average below 16 °C in May, June and September–November (0.7–14.5 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	20.1	9	98	12	14:38
June	25.8	14.5	94	11	15:20
July	28.9	18.1	116	13	15:04
August	27.4	17	97	11	13:58
September	23.2	13.4	91	9	12:33
October	16.6	7.7	121	10	11:06
November	8.9	0.7	80	9	9:45

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Manchester (United States), Providence is 3 days earlier and Montpelier 9 days later.

City	Distance	Date	Difference
Concord	25 km	22 May – 11 July	2 days later
Boston	77 km	19 May – 24 July	1 day earlier
Worcester (United States)	85 km	20 May – 19 July	same day
Portland, Maine	122 km	28 May – 15 July	8 days later
Providence	130 km	17 May – 19 July	3 days earlier
Montpelier	167 km	29 May – 27 June	9 days later

Where to buy tomato plants and seeds near Manchester (United States)

Buy plants ready to set out from 20 May to 13 July (from 29 April to 13 July for an unheated greenhouse); seed for raising your own is sown from 8 March to 22 May. Within 15 km of Manchester (United States) OpenStreetMap lists 6 garden centres, 1 farm-supply shop and 8 farm shops (collected 28 October 2026).

Giant Landscaping Materials — garden centre
Hanover Street 1071, 03104 Manchester · 3 km · giantlandscaping.net
Demers Garden Center — garden centre
South Mammoth Road 656, 03109 Manchester · 6 km · demersgardencenter.com
Amherst Garden Center — garden centre
NH 101 305, 03031 Amherst · 15 km
Osborne's Agway — farm supply
Cinemagic Way 16, 03106 Hooksett · Mon–Fri 08:00–18:00; Sat 08:00–17:00; Sun 09:00–16:00 · 6 km · osbornesagway.com

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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