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Last and first frost dates in Spokane

United States

In Spokane the last spring frost usually comes around 21 April and the first autumn frost around 15 October, which leaves about 177 frost-free days (median of 2016–2025). Tomato seedlings can go into open ground from 15 May to 25 June.

Last spring frostaround 21 April
First autumn frostaround 15 October
Frost-free days177 days
Hardiness zone (USDA-equivalent)official USDA map: 7a

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 Spokane?

The last frost in Spokane usually comes around 21 April: 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 31 March, while corn waits until 1 May. The first autumn frost follows around 15 October, about 177 days later: harvest or cover frost-tender crops before then.

When to sow and plant

CropSow for seedlingsPlant out in a greenhouseOpen ground
Achocha26 February – 7 July7 April – 16 August28 April – 16 August
Ageratumfrom 27 February—from 15 May
Arugula——sow 31 March – 10 September
Basil24 March – 13 August1 May – 20 September22 May – 20 September
Beet——sow 31 March – 16 August
Bell Pepper2 March – 26 April1 May – 25 June22 May – 25 June
Black-eyed Susanfrom 4 February—from 28 April
Bok Choy3 March – 24 August7 April – 28 September28 April – 28 September
Borage——sow 28 April – 21 August
Broad bean——sow 31 March – 7 July
Broccoli——sow 31 March – 30 June
Brussels Sprouts24 January – 28 May10 March – 12 July31 March – 12 July
Busy Lizziefrom 3 February—from 28 April
Cabbage——sow 31 March – 7 June
Calendula——sow from 31 March
Carrot——sow 31 March – 23 July
Cauliflower27 January – 30 June10 March – 11 August31 March – 11 August
Celeriac20 January – 27 April7 April – 13 July28 April – 13 July
Celery20 January – 7 May7 April – 23 July28 April – 23 July
Celosiafrom 12 Marchfrom 26 Aprilfrom 17 May
Chamomile——sow 31 March – 11 August
Chayote12 January – 20 April10 April – 17 July1 May – 17 July
Chickpea——sow 31 March – 27 June
Chicory13 February – 22 July—31 March – 16 August
Chili Pepper2 March – 2 June1 May – 1 August22 May – 1 August
China asterfrom 10 Marchfrom 1 Mayfrom 22 May
Chives——sow 31 March – 2 August
Cilantro——sow 31 March – 12 August
Corn——sow 1 May – 27 June
Corn poppy——sow from 31 March
Cosmosfrom 12 Marchfrom 26 Aprilfrom 17 May
Cucumber3 April – 3 July1 May – 31 July22 May – 31 July
Daikon——sow 31 March – 9 August
Delphiniumfrom 10 January—from 31 March
Dill——sow 31 March – 22 August
Edging lobeliafrom 3 February—from 28 April
Eggplant2 March – 26 April1 May – 25 June22 May – 25 June
Florence fennel21 February – 7 July7 April – 21 August28 April – 21 August
Foxglovefrom 23 December—from 31 March
Garden sorrel——sow 31 March – 10 August
Green Beans——sow 17 May – 5 July
Hollyhock——sow from 31 March
Hyssop——sow 31 March – 3 July
Kale——sow 31 March – 4 August
Kiwano23 March – 10 July24 April – 11 August15 May – 11 August
Kohlrabi——sow 31 March – 14 August
Leek30 December – 18 April10 March – 27 June31 March – 27 June
Lemon balm——sow 31 March – 6 August
Lettuce——sow 31 March – 19 August
Lisianthusfrom 13 Decemberfrom 10 Marchfrom 31 March
Lovage——sow from 31 March
Luffa20 March – 4 May1 May – 15 June22 May – 15 June
Marigoldfrom 24 Februaryfrom 7 Aprilfrom 28 April
Marjoram2 March – 22 July—22 May – 20 September
Melon3 April – 20 June1 May – 18 July22 May – 18 July
Microgreens——sow 17 May – 1 October
Moringa28 March – 27 July22 May – 20 September12 June – 20 September
Moss rosefrom 10 February—from 28 April
Mustard greens——sow 31 March – 31 August
Napa cabbage5 March – 1 August7 April – 3 September28 April – 3 September
Nasturtiumfrom 28 Februaryfrom 7 Aprilfrom 28 April
Okra20 March – 15 July1 May – 26 August22 May – 26 August
Oregano9 January – 12 July10 March – 10 September31 March – 10 September
Pansyfrom 13 Januaryfrom 10 Marchfrom 31 March
Parsley——sow 31 March – 31 July
Parsnip——sow 31 March – 19 June
Peanut25 March – 10 June1 May – 17 July22 May – 17 July
Peas——sow 31 March – 2 August
Petuniafrom 27 Februaryfrom 1 Mayfrom 22 May
Physalis10 March – 7 June24 April – 22 July15 May – 22 July
Pumpkin20 March – 9 May1 May – 20 June22 May – 20 June
Purple coneflowerfrom 7 January—from 31 March
Radish——sow 31 March – 15 September
Sage20 January – 8 July10 March – 26 August31 March – 26 August
Scarlet sagefrom 3 March—from 15 May
Snapdragonfrom 4 Januaryfrom 10 Marchfrom 31 March
Soybean——sow 22 May – 27 July
Spinach——sow 31 March – 21 August
Stevia6 March – 29 May24 April – 17 July15 May – 17 July
Stock——sow from 31 March
Sunflower——sow from 17 May
Sweet alyssum——sow from 31 March
Sweet Corn22 March – 22 July13 April – 13 August4 May – 13 August
Sweet peafrom 27 Januaryfrom 10 Marchfrom 31 March
Sweet William——sow from 31 March
Swiss Chard——sow 31 March – 16 August
Thyme——sow 31 March – 27 June
Tomato3 March – 4 May24 April – 25 June15 May – 25 June
Turnip——sow 31 March – 18 August
Watercress——sow 31 March – 29 August
Watermelon3 April – 8 June1 May – 6 July22 May – 6 July
Zinniafrom 17 Aprilfrom 22 Mayfrom 12 June
Zucchini10 April – 8 July1 May – 29 July22 May – 29 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.

What planting zone is Spokane?

The official USDA map (2023, 1991–2020 data) puts the centre of Spokane (ZIP 99201) in zone 7a. Zone 7a stands for an average coldest night of 0 to 5 °F (-17.8 to -15 °C), so perennials hardy to zone 7a or a colder zone should come through a typical winter here.

Check the official USDA map for Spokane: USDA Plant Hardiness Zone Map.

When the soil warms up in Spokane

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 3 days after the last spring frost and 15 °C 24 days after it.

SoilDateAgainst the last spring frost
5 °C23 March29 days earlier
10 °C24 April3 days later
15 °C15 May24 days later
18 °C22 May31 days later

Frost dates near Spokane

Of the nearest cities on our list, the last spring frost ends earliest in Tacoma (15 March) and latest in Missoula (18 May).

CityDistanceLast spring frostFirst autumn frost
Yakima261 km13 April24 October
Missoula271 km18 May6 October
Kelowna289 km18 April31 October
Seattle367 km20 March24 November
Tacoma381 km15 March3 December

Seeds, seedlings and markets in Spokane

Within 15 km of Spokane OpenStreetMap lists 13 garden centres, 6 farm-supply shops, 4 plant nurseries and 1 market (collected 20 October 2026). The nearest garden centre to the city centre is Fern Plant Shop, 1 km away.

Places: © OpenStreetMap contributors, ODbL.

What to grow at home in winter in Spokane

Frosts in Spokane usually come from about 15 October to about 21 April. 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 Spokane by month

Average weather in Spokane over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: May–September (21.2–31.3 °C). Months that average 30 °C or more by day: July (31.3 °C) and August (30.9 °C). Nights average below 0 °C in November–March (-5.2–-1.1 °C). About 533 mm of rain falls in a year, on 106 days; December is the wettest month (73 mm) and July the driest (6 mm).

MonthDay, °CNight, °CRain, mmRainy days
January1.6-5.26213
February3.8-4.95111
March9.9-1.35712
April152.54310
May21.27.8509
June25.511.7306
July31.315.962
August30.915.5143
September24.810.8204
October15.33.8569
November6.8-1.17113
December1.9-4.37314

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 15 September
Crocus15 September – 23 November
Daffodil15 September – 23 November
Garlic15 September – 23 November
Grape hyacinthby 15 September
Helleboreby 15 September
Hyacinth15 September – 23 November
Lilyby 15 September
Ornamental onionby 15 September
Peonyby 15 September
Saffronby 15 September
Snowdropby 15 September
Tulip15 September – 23 November
Wild garlicby 15 September

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).