When to plant watermelons in Charlottetown: 27 June – 24 July

In Charlottetown, watermelon: sow for seedlings from 9 May to 26 June; plant into a greenhouse from 6 June to 24 July; plant out into open ground from 27 June to 24 July.

Watermelon in Charlottetown: soil, season and weather

In Charlottetown the soil, not frost, sets the date: the last frost is over around 10 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 27 June, 48 days later.

Last spring frost	10 May
Top 7 cm of soil at 18 °C	27 June, 48 days after the last frost
Into an unheated greenhouse	6 June – 24 July; June outside: 11.3 °C at night, 19.8 °C by day; card 18–35 °C
First autumn frost	2 November, 128 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	25 August – 21 September
Days left for picking	69
Daylight	15:28 on 30 May, 15:46 on 27 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 12 rainy days

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

Watermelon in Charlottetown: care after planting

Planted on 27 June: in the first weeks water every 5 days.

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

27 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 Charlottetown during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 23.9 °C. Months that stay below 18 °C even by day on average: October (13.8 °C) and November (6.8 °C). Nights average below 18 °C in every month of the season, from 0.5 °C to 16.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	19.8	11.3	104	11	15:46
July	23.9	16.1	88	12	15:27
August	23.5	15.9	93	12	14:12
September	19.5	12.2	89	10	12:36
October	13.8	7	105	10	10:59
November	6.8	0.5	134	14	9:28

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Charlottetown, Quebec City is 6 days earlier and Halifax 6 days later.

City	Distance	Date	Difference
Moncton	130 km	26 June – 26 July	1 day earlier
Halifax	179 km	3 July – 31 July	6 days later
Fredericton	275 km	28 June – 19 July	1 day later
Bangor	464 km	25 June – 25 July	2 days earlier
Augusta	562 km	22 June – 25 July	5 days earlier
Quebec City	621 km	21 June – 19 July	6 days earlier

Where to buy watermelon plants and seeds near Charlottetown

Buy plants ready to set out from 27 June to 24 July (from 6 June to 24 July for an unheated greenhouse); seed for raising your own is sown from 9 May to 26 June. Within 15 km of Charlottetown OpenStreetMap lists 1 farm shop (collected 20 October 2026).

Freshest Fruits and Vegetables — farm shop
2 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