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Last and first frost dates in Whitehorse

Canada

In Whitehorse the last spring frost usually comes around 18 May and the first autumn frost around 28 September, which leaves about 133 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 29 June to 20 July.

Last spring frostaround 18 May
First autumn frostaround 28 September
Frost-free days133 days

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.

When is the last frost in Whitehorse?

The last frost in Whitehorse usually comes around 18 May: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 27 April, while corn waits until 15 June. The first autumn frost follows around 28 September, about 133 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha7 April – 20 June17 May – 30 July7 June – 30 July
Ageratumfrom 13 April—from 29 June
Arugula——sow 27 April – 24 August
Basil11 May – 27 July18 June – 3 September9 July – 3 September
Beet——sow 27 April – 30 July
Bell Pepper19 April – 21 May18 June – 20 July9 July – 20 July
Black-eyed Susanfrom 16 March—from 7 June
Bok Choy12 April – 7 August17 May – 11 September7 June – 11 September
Borage——sow 25 May – 4 August
Broad bean——sow 27 April – 20 June
Broccoli——sow 27 April – 13 June
Brussels Sprouts20 February – 11 May6 April – 25 June27 April – 25 June
Busy Lizziefrom 2 March—from 25 May
Cabbage——sow 27 April – 21 May
Calendula——sow from 27 April
Carrot——sow 27 April – 6 July
Cauliflower23 February – 13 June6 April – 25 July27 April – 25 July
Celeriac1 March – 10 April17 May – 26 June7 June – 26 June
Celery1 March – 20 April17 May – 6 July7 June – 6 July
Celosiafrom 27 Aprilfrom 11 Junefrom 2 July
Chamomile——sow 27 April – 25 July
Chayote26 February – 3 April25 May – 30 June15 June – 30 June
Chickpea——sow 27 April – 10 June
Chicory12 March – 5 July—27 April – 30 July
Chili Pepper19 April – 16 May18 June – 15 July9 July – 15 July
China asterfrom 27 Aprilfrom 18 Junefrom 9 July
Chives——sow 27 April – 16 July
Cilantro——sow 27 April – 26 July
Corn——sow from 15 June
Corn poppy——sow from 27 April
Cosmosfrom 27 Aprilfrom 11 Junefrom 2 July
Cucumber21 May – 16 June18 June – 14 July9 July – 14 July
Daikon——sow 27 April – 23 July
Delphiniumfrom 6 February—from 27 April
Dill——sow 27 April – 5 August
Edging lobeliafrom 15 March—from 7 June
Eggplant19 April – 21 May18 June – 20 July9 July – 20 July
Florence fennel2 April – 20 June17 May – 4 August7 June – 4 August
Foxglovefrom 19 January—from 27 April
Garden sorrel——sow 27 April – 24 July
Green Beans——sow 2 July – 30 July
Hollyhock——sow from 27 April
Hyssop——sow 27 April – 16 June
Kale——sow 27 April – 18 July
Kiwano7 May – 23 June8 June – 25 July29 June – 25 July
Kohlrabi——sow 27 April – 28 July
Leek26 January – 1 April6 April – 10 June27 April – 10 June
Lemon balm——sow 27 April – 20 July
Lettuce——sow 27 April – 2 August
Lisianthusfrom 9 Januaryfrom 6 Aprilfrom 27 April
Lovage——sow from 27 April
Luffafrom 7 Mayfrom 18 Junefrom 9 July
Marigoldfrom 5 Aprilfrom 17 Mayfrom 7 June
Marjoram19 April – 5 July—9 July – 3 September
Melonfrom 21 Mayfrom 18 Junefrom 9 July
Microgreens——sow 2 July – 14 September
Moringa10 March – 10 July4 May – 3 September25 May – 3 September
Moss rosefrom 9 March—from 25 May
Mustard greens——sow 27 April – 14 August
Napa cabbage14 April – 15 July17 May – 17 August7 June – 17 August
Nasturtiumfrom 9 Aprilfrom 17 Mayfrom 7 June
Okra7 May – 28 June18 June – 9 August9 July – 9 August
Oregano5 February – 25 June6 April – 24 August27 April – 24 August
Pansyfrom 9 Februaryfrom 6 Aprilfrom 27 April
Parsley——sow 27 April – 14 July
Parsnip——sow 27 April – 2 June
Peanutfrom 12 Mayfrom 18 Junefrom 9 July
Peas——sow 27 April – 16 July
Petuniafrom 16 Aprilfrom 18 Junefrom 9 July
Physalis24 April – 21 May8 June – 5 July29 June – 5 July
Pumpkin7 May – 3 June18 June – 15 July9 July – 15 July
Purple coneflowerfrom 3 February—from 27 April
Radish——sow 27 April – 29 August
Sage16 February – 21 June6 April – 9 August27 April – 9 August
Scarlet sagefrom 17 April—from 29 June
Snapdragonfrom 31 Januaryfrom 6 Aprilfrom 27 April
Soybean——sow 9 July – 10 July
Spinach——sow 27 April – 4 August
Stevia20 April – 12 May8 June – 30 June29 June – 30 June
Stock——sow from 27 April
Sunflower——sow from 2 July
Sweet alyssum——sow from 27 April
Sweet Corn10 May – 5 July1 June – 27 July22 June – 27 July
Sweet peafrom 23 Februaryfrom 6 Aprilfrom 27 April
Sweet William——sow from 27 April
Swiss Chard——sow 27 April – 30 July
Thyme——sow 27 April – 10 June
Tomato17 April – 29 May8 June – 20 July29 June – 20 July
Turnip——sow 27 April – 1 August
Watercress——sow 27 April – 12 August
Watermelon21 May – 3 July18 June – 31 July9 July – 31 July
Zinniafrom 30 Marchfrom 4 Mayfrom 25 May
Zucchini28 May – 21 June18 June – 12 July9 July – 12 July

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. 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.

When the soil warms up in Whitehorse

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 20 days after the last spring frost and 15 °C 42 days after it.

SoilDateAgainst the last spring frost
5 °C11 May7 days earlier
10 °C7 June20 days later
15 °C29 June42 days later
18 °C9 July52 days later

Frost dates near Whitehorse

Of the nearest cities on our list, the last spring frost ends earliest in Vancouver (27 March) and latest in Juneau (27 May).

CityDistanceLast spring frostFirst autumn frost
Juneau272 km27 May6 October
Fairbanks788 km8 May23 September
Anchorage801 km30 April14 October
Yellowknife1,107 km23 May4 October
Vancouver1,477 km27 March17 November

Seeds, seedlings and markets in Whitehorse

Within 15 km of Whitehorse OpenStreetMap lists 1 garden centre and 1 farm shop (collected 28 October 2026).

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Whitehorse

Frosts in Whitehorse usually come from about 28 September to about 18 May. These plants have indoor care in their Greenly cards and are harvested quickly, so they can be sown on a windowsill in winter.

Weather in Whitehorse by month

Average weather in Whitehorse over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: July (21 °C). Nights average below 0 °C in October–April (-15.5–-1.7 °C). About 455 mm of rain falls in a year, on 112 days; August is the wettest month (59 mm) and March the driest (19 mm).

MonthDay, °CNight, °CRain, mmRainy days
January-8.8-14.6277
February-7.3-15.5258
March-0.9-10.8196
April6.3-3.9196
May13.22339
June18.67.25411
July2110.25812
August198.85911
September134.34411
October4.6-1.75012
November-4.7-9.93110
December-9.8-15.5369

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

CropWhen to plant
Bearded Irisby 29 August
Crocus29 August – 7 October
Daffodil29 August – 7 October
Garlic29 August – 7 October
Grape hyacinthby 29 August
Helleboreby 29 August
Hyacinth29 August – 7 October
Lilyby 29 August
Ornamental onionby 29 August
Peonyby 29 August
Saffronby 29 August
Snowdropby 29 August
Tulip29 August – 7 October
Wild garlicby 29 August

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).