When to plant tomatoes in Nagoya: 12 April – 20 August

In Nagoya, tomato: sow for seedlings from 29 January to 29 June; plant into a greenhouse from 22 March to 20 August; plant out into open ground from 12 April to 20 August.

Tomato in Nagoya: soil, season and weather

In Nagoya the soil, not frost, sets the date: the last frost is over around 22 March, but the top 7 cm of soil reaches 15 °C — the minimum on the tomato card — only around 12 April, 21 days later.

Last spring frost	22 March
Top 7 cm of soil at 15 °C	12 April, 21 days after the last frost
Into an unheated greenhouse	22 March – 20 August; March outside: 4 °C at night, 14.2 °C by day; card 16–27 °C
First autumn frost	10 December, 242 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	21 June – 29 October
Days left for picking	172
Daylight	11:03 on 19 February, 12:57 on 12 April
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 8 rainy days

Tomato in Nagoya: care after planting

Planted on 12 April: in the first weeks water every 4 days.

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

12 April — feed: balanced (NPK)
10 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 Nagoya during the tomato season

Days average above the tomato card's 16–27 °C in July (30.2 °C), August (32.2 °C) and September (28.2 °C). Months that stay below 16 °C even by day on average: December (10.7 °C). Nights average below 16 °C in April, May and October–December (1.9–13.9 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
April	19	9.1	157	10	13:03
May	23.2	13.6	189	11	14:00
June	26.5	18.3	250	15	14:31
July	30.2	22.8	301	17	14:19
August	32.2	24	211	17	13:30
September	28.2	20.8	214	16	12:26
October	22.1	13.9	190	11	11:20
November	16.6	7.5	88	8	10:20
December	10.7	1.9	57	8	9:48

ERA5 2016–2025, Open-Meteo

Tomato in nearby cities

Around Nagoya, Tokyo is 8 days earlier and Niigata 23 days later.

City	Distance	Date	Difference
Hamamatsu	92 km	5 April – 28 August	7 days earlier
Kyoto	105 km	21 April – 17 August	9 days later
Osaka	139 km	15 April – 27 August	3 days later
Tokyo	259 km	4 April – 24 August	8 days earlier
Okayama	278 km	21 April – 25 August	9 days later
Niigata	360 km	5 May – 30 August	23 days later

Where to buy tomato plants and seeds near Nagoya

Buy plants ready to set out from 12 April to 20 August (from 22 March to 20 August for an unheated greenhouse); seed for raising your own is sown from 29 January to 29 June. Within 15 km of Nagoya OpenStreetMap lists 7 garden centres, 8 markets and 1 farm shop (collected 28 October 2026).

T's Garden Square — garden centre
13 km
石屋 — garden centre
13 km
大矢園芸 — garden centre
3 km
花いちば — garden centre
8 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.

Questions