When to plant zucchini in Osaka: 5 May – 30 September

In Osaka, zucchini: sow for seedlings from 24 March to 9 September; plant into a greenhouse from 14 April to 30 September; plant out into open ground from 5 May to 30 September.

Zucchini in Osaka: soil, season and weather

In Osaka the soil, not frost, sets the date: the last frost is over around 14 March, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 5 May, 52 days later.

Last spring frost	14 March
Top 7 cm of soil at 18 °C	5 May, 52 days after the last frost
First autumn frost	17 December, 226 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	10 June – 5 November
Days left for picking	190
Daylight	13:00 on 14 April, 13:41 on 5 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 6 rainy days

The same dates in Osaka hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Osaka: care after planting

Planted on 5 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Osaka during the zucchini season

About 1364 mm of rain falls in the season; December is the driest month (49 mm) and June the wettest (244 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23	14.5	189	10	13:58
June	26.5	19.1	244	14	14:28
July	30.8	23.9	240	15	14:16
August	32.5	25.1	173	14	13:29
September	28.9	21.7	209	14	12:26
October	22.5	14.7	188	11	11:21
November	16.8	8.3	72	7	10:22
December	11.1	2.8	49	6	9:51

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Osaka, Tokyo is 7 days earlier and Hiroshima 21 days later.

City	Distance	Date	Difference
Kyoto	43 km	14 May – 20 September	9 days later
Nagoya	139 km	6 May – 23 September	1 day later
Okayama	145 km	14 May – 28 September	9 days later
Hamamatsu	204 km	2 May – 1 October	3 days earlier
Hiroshima	281 km	26 May – 8 September	21 days later
Tokyo	397 km	28 April – 27 September	7 days earlier

Where to buy zucchini plants and seeds near Osaka

Buy plants ready to set out from 5 May to 30 September (from 14 April to 30 September for an unheated greenhouse); seed for raising your own is sown from 24 March to 9 September. Within 15 km of Osaka OpenStreetMap lists 16 garden centres, 4 farm-supply shops, 3 plant nurseries, 19 markets and 8 farm shops (collected 28 October 2026).

野田園芸店 — garden centre
7 km
花ぼうし — garden centre
7 km
サイト園芸・燃料 — garden centre
9 km
富松苗圃 — plant nursery
12 km · amaryoku.or.jp

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