When to plant watermelons in Regina: 6 June – 27 June

In Regina, watermelon: sow for seedlings from 18 April to 30 May; plant into a greenhouse from 16 May to 27 June; plant out into open ground from 6 June to 27 June.

Watermelon in Regina: soil, season and weather

In Regina the soil, not frost, sets the date: the last frost is over around 14 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 6 June, 23 days later.

Last spring frost	14 May
Top 7 cm of soil at 18 °C	6 June, 23 days after the last frost
Into an unheated greenhouse	16 May – 27 June; May outside: 5.8 °C at night, 19.4 °C by day; card 18–35 °C
First autumn frost	6 October, 122 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	4 August – 25 August
Days left for picking	63
Daylight	15:09 on 9 May, 16:16 on 6 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, October, has 7 rainy days

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

Watermelon in Regina: care after planting

Planted on 6 June: in the first weeks water every 5 days.

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

6 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 Regina during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 26 °C. Months that stay below 18 °C even by day on average: October (10.2 °C). Nights average below 18 °C in every month of the season, from 0.6 °C to 14.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	23.4	11.5	74	10	16:25
July	26	14.2	55	8	16:02
August	25.4	13.2	54	7	14:34
September	20.7	8.8	40	6	12:41
October	10.2	0.6	36	7	10:48

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Regina, Bismarck is 6 days earlier and Calgary 12 days later.

City	Distance	Date	Difference
Saskatoon	235 km	15 June – 27 June	9 days later
Bismarck	494 km	31 May – 6 July	6 days earlier
Winnipeg	536 km	1 June – 3 July	5 days earlier
Billings	594 km	2 June – 5 July	4 days earlier
Grand Forks	615 km	5 June – 7 July	1 day earlier
Calgary	668 km	18 June – 22 June	12 days later

Where to buy watermelon plants and seeds near Regina

Buy plants ready to set out from 6 June to 27 June (from 16 May to 27 June for an unheated greenhouse); seed for raising your own is sown from 18 April to 30 May. Within 15 km of Regina OpenStreetMap lists 9 garden centres, 1 farm-supply shop, 1 plant nursery and 3 markets (collected 20 October 2026).

Crescent Market Place — garden centre
1 km
West 25th Greenhouse — garden centre
5 km
Wascana Nursery — plant nursery
3 km
Nutrien — farm supply
7 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