When to plant tomatoes in Concord: 22 May – 11 July

In Concord, tomato: sow for seedlings from 10 March to 20 May; plant into a greenhouse from 1 May to 11 July; plant out into open ground from 22 May to 11 July. For plants and seeds, the places nearby include Brochu Nurseries And Landscaping (farm supply, 2 km) and Osborne's Farm and Garden Centers (garden centre, 5 km); addresses and opening hours are below.

Tomato in Concord: soil, season and weather

In Concord 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 22 May, 30 days later.

Last spring frost	22 April
Top 7 cm of soil at 15 °C	22 May, 30 days after the last frost
Into an unheated greenhouse	1 May – 11 July; May outside: 8.4 °C at night, 19.7 °C by day; card 16–27 °C
First autumn frost	31 October, 162 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	31 July – 19 September
Days left for picking	92
Daylight	12:40 on 31 March, 14:53 on 22 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, August, has 11 rainy days

Tomato in Concord: care after planting

Planted on 22 May: in the first weeks water every 4 days.

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

22 May — feed: balanced (NPK)
19 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 Concord during the tomato season

Days average above the tomato card's 16–27 °C in July (28.6 °C) and August (27.1 °C). Nights average below 16 °C in May, June and September, October (7–13.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.7	8.4	91	12	14:39
June	25.5	13.8	91	11	15:22
July	28.6	17.5	110	13	15:05
August	27.1	16.5	86	11	13:59
September	22.9	12.8	86	9	12:33
October	16.3	7	106	10	11:06

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Concord, Providence is 5 days earlier and Montpelier 7 days later.

City	Distance	Date	Difference
Manchester (United States)	25 km	20 May – 13 July	2 days earlier
Boston	102 km	19 May – 24 July	3 days earlier
Worcester (United States)	107 km	20 May – 19 July	2 days earlier
Portland, Maine	115 km	28 May – 15 July	6 days later
Montpelier	143 km	29 May – 27 June	7 days later
Providence	155 km	17 May – 19 July	5 days earlier

Where to buy tomato plants and seeds near Concord

Buy plants ready to set out from 22 May to 11 July (from 1 May to 11 July for an unheated greenhouse); seed for raising your own is sown from 10 March to 20 May. Within 15 km of Concord OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 6 farm shops (collected 28 October 2026).

Osborne's Farm and Garden Centers — garden centre
Sheep Davis Road 258, 03301 Concord · 5 km · osbornesagway.com
Brochu Nurseries And Landscaping — farm supply
Commercial Street 121, 03301 · Mon–Fri 08:00–16:30 · 2 km · brochunursery.com
Johnson Golden Harvest — farm shop
West River Road 412, 03106 Hooksett · Mon–Fri 10:00–18:00; Sat 10:00–17:00; Sun 11:00–17:00 · 15 km
Carter Hill Orchard — farm shop
Carter Hill Road 73, 03303 Concord · 6 km · carterhillapples.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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