When to plant tomatoes in Whitehorse: 29 June – 20 July

In Whitehorse, tomato: sow for seedlings from 17 April to 29 May; plant into a greenhouse from 8 June to 20 July; plant out into open ground from 29 June to 20 July. For plants and seeds, the places nearby include Candy's Fruit Stand (farm shop, 1 km); addresses and opening hours are below.

Tomato 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 15 °C — the minimum on the tomato card — only around 29 June, 42 days later. 91 days separate planting out (29 June) from the first autumn frost (28 September); the card's 70 days to the first harvest leave 21 for picking, so a start 3 weeks late would still fit.

Last spring frost	18 May
Top 7 cm of soil at 15 °C	29 June, 42 days after the last frost
Into an unheated greenhouse	8 June – 20 July; June outside: 7.2 °C at night, 18.6 °C by day; card 16–27 °C
First autumn frost	28 September, 91 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	7 September – 28 September
Days left for picking	21
Daylight	16:42 on 8 May, 19:04 on 29 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, September, has 11 rainy days

Tomato in Whitehorse: care after planting

Planted on 29 June: in the first weeks water every 4 days.

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

29 June — feed: balanced (NPK)
27 July — feed: nitrogen

Pests and diseases of tomato 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 tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, July, averages 21 °C. Months that stay below 16 °C even by day on average: September (13 °C). Nights average below 16 °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
June	18.6	7.2	54	11	19:06
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

Tomato in nearby cities

Around Whitehorse, Vancouver is 32 days earlier and Juneau 4 days later.

City	Distance	Date	Difference
Juneau	272 km	3 July – 28 July	4 days later
Fairbanks	788 km	8 June – 15 July	21 days earlier
Anchorage	801 km	22 June – 24 June	7 days earlier
Yellowknife	1,107 km	22 June – 26 July	7 days earlier
Vancouver	1,477 km	28 May – 28 July	32 days earlier
Edmonton	1,516 km	3 June – 16 June	26 days earlier

Where to buy tomato plants and seeds near Whitehorse

Buy plants ready to set out from 29 June to 20 July (from 8 June to 20 July for an unheated greenhouse); seed for raising your own is sown from 17 April to 29 May. 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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