When to plant watermelons in Concord: 1 June – 22 July

In Concord, watermelon: sow for seedlings from 13 April to 24 June; plant into a greenhouse from 11 May to 22 July; plant out into open ground from 1 June to 22 July. For plants and seeds, the places nearby include Meadow Ledge Farm (farm shop, 15 km); addresses and opening hours are below.

Watermelon 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 18 °C — the minimum on the watermelon card — only around 1 June, 40 days later.

Last spring frost	22 April
Top 7 cm of soil at 18 °C	1 June, 40 days after the last frost
Into an unheated greenhouse	11 May – 22 July; May outside: 8.4 °C at night, 19.7 °C by day; card 18–35 °C
First autumn frost	31 October, 152 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	30 July – 19 September
Days left for picking	93
Daylight	14:14 on 4 May, 15:09 on 1 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 11 rainy days

The same dates in Concord hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Concord: care after planting

Planted on 1 June: in the first weeks water every 5 days.

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

1 June — feed: balanced (NPK)

Pests and diseases of watermelon 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 watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 28.6 °C. Months that stay below 18 °C even by day on average: October (16.3 °C). Nights average below 18 °C in every month of the season, from 7 °C to 17.5 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
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

Watermelon in nearby cities

Around Concord, Boston is 3 days earlier and Portland, Maine 19 days later.

City	Distance	Date	Difference
Manchester (United States)	25 km	30 May – 24 July	2 days earlier
Boston	102 km	29 May – 4 August	3 days earlier
Worcester (United States)	107 km	31 May – 30 July	1 day earlier
Portland, Maine	115 km	20 June – 26 July	19 days later
Montpelier	143 km	20 June – 8 July	19 days later
Providence	155 km	31 May – 30 July	1 day earlier

Where to buy watermelon plants and seeds near Concord

Buy plants ready to set out from 1 June to 22 July (from 11 May to 22 July for an unheated greenhouse); seed for raising your own is sown from 13 April to 24 June. Within 15 km of Concord OpenStreetMap lists 3 garden centres, 1 farm-supply shop and 6 farm shops (collected 28 October 2026).

Meadow Ledge Farm — farm shop
Route 129 612, Loudon · 15 km · meadowledgefarm.com
Cole Gardens — garden centre
7 km
Black Forest Nursery — garden centre
13 km
LaValley Farms — farm shop
14 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