When to plant eggplants in Nagoya: 6 May – 20 August

In Nagoya, eggplant: sow for seedlings from 14 February to 21 June; plant into a greenhouse from 15 April to 20 August; plant out into open ground from 6 May to 20 August.

Eggplant 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 18 °C — the minimum on the eggplant card — only around 6 May, 45 days later.

Last spring frost	22 March
Top 7 cm of soil at 18 °C	6 May, 45 days after the last frost
Into an unheated greenhouse	15 April – 20 August; April outside: 9.1 °C at night, 19 °C by day; card 21–29 °C
First autumn frost	10 December, 218 days after the start
Days in the bed to the first harvest (card)	70
First harvest, if planted in this window	15 July – 29 October
Days left for picking	148
Daylight	11:38 on 7 March, 13:45 on 6 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 8 rainy days

The same dates in Nagoya hold for Cucumber, Bell Pepper, Zucchini, Pumpkin and Watermelon.

Eggplant in Nagoya: care after planting

Planted on 6 May: in the first weeks water every 4 days.

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

6 May — feed: balanced (NPK)
3 June — feed: nitrogen

Pests and diseases of eggplant 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 eggplant season

Days average above the eggplant card's 21–29 °C in July (30.2 °C) and August (32.2 °C). Months that stay below 21 °C even by day on average: November (16.6 °C) and December (10.7 °C). Nights average below 21 °C in May, June and September–December (1.9–20.8 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
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

Eggplant in nearby cities

Around Nagoya, Tokyo is 8 days earlier and Niigata 14 days later.

City	Distance	Date	Difference
Hamamatsu	92 km	2 May – 28 August	4 days earlier
Kyoto	105 km	14 May – 17 August	8 days later
Osaka	139 km	5 May – 27 August	1 day earlier
Tokyo	259 km	28 April – 24 August	8 days earlier
Okayama	278 km	14 May – 25 August	8 days later
Niigata	360 km	20 May – 30 August	14 days later

Where to buy eggplant plants and seeds near Nagoya

Buy plants ready to set out from 6 May to 20 August (from 15 April to 20 August for an unheated greenhouse); seed for raising your own is sown from 14 February to 21 June. Within 15 km of Nagoya OpenStreetMap lists 7 garden centres, 8 markets and 1 farm shop (collected 28 October 2026).

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