When to plant watermelons in Whitehorse: 9 July – 31 July

In Whitehorse, watermelon: sow for seedlings from 21 May to 3 July; plant into a greenhouse from 18 June to 31 July; plant out into open ground from 9 July to 31 July. For plants and seeds, the places nearby include Candy's Fruit Stand (farm shop, 1 km); addresses and opening hours are below.

Watermelon in Whitehorse: soil, season and weather

In Whitehorse the soil, not frost, sets the date: the last frost is over around 18 May, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 9 July, 52 days later. 81 days separate planting out (9 July) from the first autumn frost (28 September); the card's 59 days to the first harvest leave 22 for picking, so a start 3 weeks late would still fit.

Last spring frost	18 May
Top 7 cm of soil at 18 °C	9 July, 52 days after the last frost
Into an unheated greenhouse	18 June – 31 July; June outside: 7.2 °C at night, 18.6 °C by day; card 18–35 °C
First autumn frost	28 September, 81 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	6 September – 28 September
Days left for picking	22
Daylight	18:59 on 11 June, 18:41 on 9 July
Watering outdoors when fruiting (card)	every 5 days; the driest month, September, has 11 rainy days

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

Watermelon in Whitehorse: care after planting

Planted on 9 July: in the first weeks water every 5 days.

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

9 July — 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 Whitehorse during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, July, averages 21 °C. Months that stay below 18 °C even by day on average: September (13 °C). Nights average below 18 °C in every month of the season, from 4.3 °C to 10.2 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
July	21	10.2	58	12	18:20
August	19	8.8	59	11	15:50
September	13	4.3	44	11	12:59

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon earlier than Whitehorse; the closest date is in Anchorage, 2 days earlier.

City	Distance	Date	Difference
Juneau	272 km	3 June – 27 June	36 days earlier
Fairbanks	788 km	19 June – 26 July	20 days earlier
Anchorage	801 km	7 July – 16 August	2 days earlier
Yellowknife	1,107 km	30 June – 6 August	9 days earlier
Vancouver	1,477 km	22 June – 8 August	17 days earlier
Edmonton	1,516 km	27 June – 27 June	12 days earlier

Where to buy watermelon plants and seeds near Whitehorse

Buy plants ready to set out from 9 July to 31 July (from 18 June to 31 July for an unheated greenhouse); seed for raising your own is sown from 21 May to 3 July. Within 15 km of Whitehorse OpenStreetMap lists 1 garden centre and 1 farm shop (collected 28 October 2026).

Candy's Fruit Stand — farm shop
Black Street 208, Y1A 2M9 Whitehorse · 1 km · candysfruitstand.com
Walmart Garden Centre — garden centre
2 km · walmart.ca

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.

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