When to plant zucchini in Hamamatsu: 2 May – 1 October

In Hamamatsu, zucchini: sow for seedlings from 21 March to 10 September; plant into a greenhouse from 11 April to 1 October; plant out into open ground from 2 May to 1 October.

Zucchini in Hamamatsu: soil, season and weather

In Hamamatsu the soil, not frost, sets the date: the last frost is over around 24 February, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 2 May, 67 days later.

Last spring frost	24 February
Top 7 cm of soil at 18 °C	2 May, 67 days after the last frost
First autumn frost	18 December, 230 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	7 June – 6 November
Days left for picking	194
Daylight	12:54 on 11 April, 13:36 on 2 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, December, has 6 rainy days

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

Zucchini in Hamamatsu: care after planting

Planted on 2 May: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Hamamatsu during the zucchini season

About 1821 mm of rain falls in the season; December is the driest month (71 mm) and June the wettest (357 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	23.2	14.6	244	12	13:58
June	26.1	18.8	357	15	14:28
July	29.9	23.3	310	16	14:16
August	31.3	24.4	218	17	13:29
September	28.2	21.3	277	18	12:26
October	23	15.4	227	14	11:21
November	18	9.4	117	9	10:22
December	12.4	4	71	6	9:51

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Hamamatsu, Tokyo is 4 days earlier and Niigata 18 days later.

City	Distance	Date	Difference
Nagoya	92 km	6 May – 23 September	4 days later
Kyoto	182 km	14 May – 20 September	12 days later
Osaka	204 km	5 May – 30 September	3 days later
Tokyo	209 km	28 April – 27 September	4 days earlier
Okayama	348 km	14 May – 28 September	12 days later
Niigata	376 km	20 May – 3 October	18 days later

Where to buy zucchini plants and seeds near Hamamatsu

Buy plants ready to set out from 2 May to 1 October (from 11 April to 1 October for an unheated greenhouse); seed for raising your own is sown from 21 March to 10 September. Within 15 km of Hamamatsu OpenStreetMap lists 5 garden centres, 6 farm-supply shops, 5 markets and 39 farm shops (collected 28 October 2026).

浜松生花市場 — market
7 km
地方卸売市場舞阪魚市場 — market
12 km
島野農園 — farm shop · sells: strawberry
7 km · shimano-nouen.com
かしまハーベスト — farm shop · sells: strawberry, melon
10 km · kashimaharvest.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