When to plant tomatoes in Tokyo: 4 April – 24 August

In Tokyo, tomato: sow for seedlings from 21 January to 3 July; plant into a greenhouse from 14 March to 24 August; plant out into open ground from 4 April to 24 August. For plants and seeds, the places nearby include JA東京むさし三鷹緑化センター (garden centre, 11 km) and 加藤種苗店 (farm supply, 12 km); addresses and opening hours are below.

Tomato in Tokyo: soil, season and weather

In Tokyo the soil, not frost, sets the date: the last frost is over around 17 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 4 April, 18 days later.

Last spring frost	17 March
Top 7 cm of soil at 15 °C	4 April, 18 days after the last frost
Into an unheated greenhouse	14 March – 24 August; March outside: 5.1 °C at night, 14.6 °C by day; card 16–27 °C
First autumn frost	14 December, 254 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	13 June – 2 November
Days left for picking	184
Daylight	10:45 on 11 February, 12:40 on 4 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 6 rainy days

Tomato in Tokyo: care after planting

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

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

4 April — feed: balanced (NPK)
2 May — 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 Tokyo during the tomato season

Days average above the tomato card's 16–27 °C in July (30.6 °C), August (32 °C) and September (28.1 °C). Months that stay below 16 °C even by day on average: December (11.6 °C). Nights average below 16 °C in April, May and October–December (2.2–14.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	19.2	10.1	127	12	13:05
May	23.5	14.8	151	13	14:02
June	26.7	19.2	188	16	14:34
July	30.6	23.4	170	16	14:21
August	32	24.5	139	14	13:32
September	28.1	21.1	194	15	12:26
October	21.9	14.3	195	13	11:20
November	16.8	8.1	86	9	10:18
December	11.6	2.2	51	6	9:46

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

All the nearest cities on our list plant tomato later than Tokyo; the closest date is in Hamamatsu, 1 day later.

City	Distance	Date	Difference
Hamamatsu	209 km	5 April – 28 August	1 day later
Niigata	255 km	5 May – 30 August	31 days later
Nagoya	259 km	12 April – 20 August	8 days later
Sendai	305 km	13 May – 3 August	39 days later
Kyoto	363 km	21 April – 17 August	17 days later
Osaka	397 km	15 April – 27 August	11 days later

Where to buy tomato plants and seeds near Tokyo

Buy plants ready to set out from 4 April to 24 August (from 14 March to 24 August for an unheated greenhouse); seed for raising your own is sown from 21 January to 3 July. Within 15 km of Tokyo OpenStreetMap lists 30 garden centres, 3 farm-supply shops, 1 plant nursery, 28 markets and 31 farm shops (collected 28 October 2026).

JA東京むさし三鷹緑化センター — garden centre
Mon, Tue, Wed, Thu, Fri, Sat, Sun 09:00–17:00 · 11 km
加藤種苗店 — farm supply
09:00–19:00 · 12 km
小川種苗 — farm supply
Thu–Tue, public holidays 09:00–17:30 · 15 km
RF1/KOBE CROQUET — market
08:00–22:00 · 1 km · himitsu.kitchen

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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