When to plant tomatoes in Spokane: 15 May – 25 June

In Spokane, tomato: sow for seedlings from 3 March to 4 May; plant into a greenhouse from 24 April to 25 June; plant out into open ground from 15 May to 25 June. For plants and seeds, the places nearby include Fern Plant Shop (garden centre, 1 km) and Northwest Seed and Pet (garden centre, 4 km); addresses and opening hours are below.

Tomato in Spokane: soil, season and weather

In Spokane the soil, not frost, sets the date: the last frost is over around 21 April, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 15 May, 24 days later.

Last spring frost	21 April
Top 7 cm of soil at 15 °C	15 May, 24 days after the last frost
Into an unheated greenhouse	24 April – 25 June; April outside: 2.5 °C at night, 15 °C by day; card 16–27 °C
First autumn frost	15 October, 153 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	24 July – 3 September
Days left for picking	83
Daylight	12:21 on 24 March, 15:07 on 15 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 2 rainy days

Tomato in Spokane: care after planting

Planted on 15 May: in the first weeks water every 4 days.

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

15 May — feed: balanced (NPK)
12 June — 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 Spokane during the tomato season

Days average above the tomato card's 16–27 °C in July (31.3 °C) and August (30.9 °C). Months that stay below 16 °C even by day on average: October (15.3 °C). Nights average below 16 °C in every month of the season, from 3.8 °C to 15.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	21.2	7.8	50	9	15:07
June	25.5	11.7	30	6	15:58
July	31.3	15.9	6	2	15:38
August	30.9	15.5	14	3	14:19
September	24.8	10.8	20	4	12:38
October	15.3	3.8	56	9	10:55

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato later than Spokane; the closest date is in Seattle, 2 days later.

City	Distance	Date	Difference
Missoula	271 km	3 June – 16 June	19 days later
Kelowna	289 km	19 May – 11 July	4 days later
Seattle	367 km	17 May – 4 August	2 days later
Olympia	418 km	31 May – 26 July	16 days later
Helena	425 km	6 June – 13 June	22 days later
Calgary	449 km	3 June – 11 June	19 days later

Where to buy tomato plants and seeds near Spokane

Buy plants ready to set out from 15 May to 25 June (from 24 April to 25 June for an unheated greenhouse); seed for raising your own is sown from 3 March to 4 May. Within 15 km of Spokane OpenStreetMap lists 13 garden centres, 6 farm-supply shops, 4 plant nurseries and 1 market (collected 20 October 2026).

Northwest Seed and Pet — garden centre
East Sprague Avenue 2422, 99202 Spokane · Mon–Sat 08:00–19:00; Sun 09:00–18:00 · 4 km · nwseed.com
Fern Plant Shop — garden centre
West Riverside Avenue 1526, 99201 Spokane · Mon–Sun 10:00–18:00 · 1 km · fernplantshop.com
Northwest Seed & Pet — garden centre
North Division Street 7302, 99208 Spokane · Mon–Sun 09:00–18:00 · 7 km · nwseed.com
SiteOne Hardscape Center — garden centre
N Fairview Rd 8721, spokane · 10 km · siteone.com

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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