When to plant tomatoes in Olympia: 31 May – 26 July

In Olympia, tomato: sow for seedlings from 19 March to 4 June; plant into a greenhouse from 10 May to 26 July; plant out into open ground from 31 May to 26 July. For plants and seeds, the places nearby include Underhill Plants (garden centre, 1 km) and Eastside Urban Farm & Garden Center (garden centre, 3 km); addresses and opening hours are below.

Tomato in Olympia: soil, season and weather

In Olympia the soil, not frost, sets the date: the last frost is over around 19 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 31 May, 73 days later.

Last spring frost	19 March
Top 7 cm of soil at 15 °C	31 May, 73 days after the last frost
Into an unheated greenhouse	10 May – 26 July; May outside: 7.9 °C at night, 19 °C by day; card 16–27 °C
First autumn frost	15 November, 168 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	9 August – 4 October
Days left for picking	98
Daylight	13:15 on 9 April, 15:36 on 31 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 3 rainy days

Tomato in Olympia: care after planting

Planted on 31 May: in the first weeks water every 4 days.

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

31 May — feed: balanced (NPK)
28 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 Olympia during the tomato season

No month of the season averages above the tomato card's 16–27 °C by day; the warmest, August, averages 26.7 °C. Months that stay below 16 °C even by day on average: October (15.4 °C) and November (10 °C). Nights average below 16 °C in every month of the season, from 4.5 °C to 13.5 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19	7.9	61	10	15:03
June	21.9	10.1	54	8	15:53
July	26	12.3	11	3	15:33
August	26.7	13.5	25	4	14:16
September	22.2	11.5	70	9	12:37
October	15.4	7.5	147	14	10:57
November	10	4.5	206	18	9:23

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato earlier than Olympia; the closest date is in Vancouver, 3 days earlier.

City	Distance	Date	Difference
Seattle	77 km	17 May – 4 August	14 days earlier
Victoria	159 km	14 May – 31 August	17 days earlier
Portland	170 km	15 May – 2 August	16 days earlier
Salem	234 km	14 May – 28 July	17 days earlier
Vancouver	250 km	28 May – 28 July	3 days earlier
Eugene	332 km	22 May – 9 July	9 days earlier

Where to buy tomato plants and seeds near Olympia

Buy plants ready to set out from 31 May to 26 July (from 10 May to 26 July for an unheated greenhouse); seed for raising your own is sown from 19 March to 4 June. Within 15 km of Olympia OpenStreetMap lists 5 garden centres, 1 plant nursery, 2 markets and 2 farm shops (collected 28 October 2026).

Eastside Urban Farm & Garden Center — garden centre
4th Avenue East 2326, 98506 Olympia · Mon–Sat 10:00–17:30; Sun 12:00–17:00 · 3 km · urbanfarmoly.com
Means Ornamental Concrete — garden centre
85th Lane Southeast 6702, 98513 Olympia · 12 km · meansornamentalconcrete.com
Underhill Plants — garden centre
Mon–Tue closed; Wed–Fri 11:00–17:00; Sat–Sun 10:00–17:00 · 1 km
Bark & Garden Center — garden centre
Mon–Sun 09:00–17:00 · 4 km

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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