When to plant watermelons in Sherbrooke: 18 June – 18 July

In Sherbrooke, watermelon: sow for seedlings from 30 April to 20 June; plant into a greenhouse from 28 May to 18 July; plant out into open ground from 18 June to 18 July.

Watermelon in Sherbrooke: soil, season and weather

In Sherbrooke the soil, not frost, sets the date: the last frost is over around 8 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 18 June, 41 days later.

Last spring frost	8 May
Top 7 cm of soil at 18 °C	18 June, 41 days after the last frost
Into an unheated greenhouse	28 May – 18 July; May outside: 7 °C at night, 18.1 °C by day; card 18–35 °C
First autumn frost	27 October, 131 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	16 August – 15 September
Days left for picking	72
Daylight	15:05 on 21 May, 15:40 on 18 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 9 rainy days

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

Watermelon in Sherbrooke: care after planting

Planted on 18 June: in the first weeks water every 5 days.

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

18 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 Sherbrooke during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 25.1 °C. Months that stay below 18 °C even by day on average: October (14 °C). Nights average below 18 °C in every month of the season, from 5.8 °C to 16.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22.5	12.6	129	14	15:39
July	25.1	16.2	142	15	15:20
August	23.7	15.1	132	15	14:09
September	20.3	11.3	73	9	12:35
October	14	5.8	115	13	11:01

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Sherbrooke, Montreal is 19 days earlier and Augusta 4 days later.

City	Distance	Date	Difference
Trois-Rivières	116 km	31 May – 20 July	18 days earlier
Montreal	132 km	30 May – 23 July	19 days earlier
Montpelier	137 km	20 June – 8 July	2 days later
Burlington	146 km	1 June – 25 July	17 days earlier
Quebec City	165 km	21 June – 19 July	3 days later
Augusta	206 km	22 June – 25 July	4 days later

Where to buy watermelon plants and seeds near Sherbrooke

Buy plants ready to set out from 18 June to 18 July (from 28 May to 18 July for an unheated greenhouse); seed for raising your own is sown from 30 April to 20 June. Within 15 km of Sherbrooke OpenStreetMap lists 3 garden centres, 2 markets and 5 farm shops (collected 20 October 2026).

Galerie Quatre Saisons — market
3 km · galeriequatresaisons.com
Le Potager d'Émylou — farm shop
5 km
La Marjolaine — farm shop
9 km
Verger La Pommalbonne — farm shop
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