When to plant watermelons in Fredericton: 28 June – 19 July

In Fredericton, watermelon: sow for seedlings from 10 May to 21 June; plant into a greenhouse from 7 June to 19 July; plant out into open ground from 28 June to 19 July.

Watermelon in Fredericton: soil, season and weather

In Fredericton the soil, not frost, sets the date: the last frost is over around 30 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 28 June, 59 days later.

Last spring frost	30 April
Top 7 cm of soil at 18 °C	28 June, 59 days after the last frost
Into an unheated greenhouse	7 June – 19 July; June outside: 11.7 °C at night, 22 °C by day; card 18–35 °C
First autumn frost	28 October, 122 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	26 August – 16 September
Days left for picking	63
Daylight	15:28 on 31 May, 15:43 on 28 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 9 rainy days

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

Watermelon in Fredericton: care after planting

Planted on 28 June: in the first weeks water every 5 days.

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

28 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 Fredericton during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 25.6 °C. Months that stay below 18 °C even by day on average: October (14.2 °C). Nights average below 18 °C in every month of the season, from 5.8 °C to 15.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	22	11.7	111	12	15:43
July	25.6	15.8	115	13	15:24
August	24.5	15	107	11	14:11
September	20.5	11.2	92	9	12:36
October	14.2	5.8	98	10	11:00

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Fredericton, Quebec City is 7 days earlier and Halifax 5 days later.

City	Distance	Date	Difference
Moncton	145 km	26 June – 26 July	2 days earlier
Bangor	203 km	25 June – 25 July	3 days earlier
Charlottetown	275 km	27 June – 24 July	1 day earlier
Halifax	282 km	3 July – 31 July	5 days later
Augusta	305 km	22 June – 25 July	6 days earlier
Quebec City	361 km	21 June – 19 July	7 days earlier

Where to buy watermelon plants and seeds near Fredericton

Buy plants ready to set out from 28 June to 19 July (from 7 June to 19 July for an unheated greenhouse); seed for raising your own is sown from 10 May to 21 June. Within 15 km of Fredericton OpenStreetMap lists 4 garden centres, 1 farm-supply shop, 2 plant nurseries, 2 markets and 6 farm shops (collected 20 October 2026).

Hoyt's — farm shop
2 km
Sunset U-Pick — farm shop
4 km
Harvey's Big Potato — farm shop
13 km
Potato Lane Vegetables — farm shop
13 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