When to plant pumpkins in Hamamatsu: 2 May – 23 August

In Hamamatsu, pumpkin: sow for seedlings from 28 February to 12 July; plant into a greenhouse from 11 April to 23 August; plant out into open ground from 2 May to 23 August.

Pumpkin 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 pumpkin 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)	75
First harvest, if planted in this window	16 July – 6 November
Days left for picking	155
Daylight	12:09 on 21 March, 13:36 on 2 May
Watering outdoors when fruiting (card)	every 5 days; the driest month, December, has 6 rainy days

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

Pumpkin in Hamamatsu: care after planting

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

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

23 May — feed: nitrogen

Pests and diseases of pumpkin 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 Hamamatsu during the pumpkin 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

Pumpkin in nearby cities

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

City	Distance	Date	Difference
Nagoya	92 km	6 May – 15 August	4 days later
Kyoto	182 km	14 May – 12 August	12 days later
Osaka	204 km	5 May – 22 August	3 days later
Tokyo	209 km	28 April – 19 August	4 days earlier
Okayama	348 km	14 May – 20 August	12 days later
Niigata	376 km	20 May – 25 August	18 days later

Where to buy pumpkin plants and seeds near Hamamatsu

Buy plants ready to set out from 2 May to 23 August (from 11 April to 23 August for an unheated greenhouse); seed for raising your own is sown from 28 February to 12 July. Within 15 km of Hamamatsu OpenStreetMap lists 5 garden centres, 6 farm-supply shops, 5 markets and 39 farm shops (collected 28 October 2026).

とくら園 — farm shop · sells: mandarin_orange
10 km · tokuraen.sakura.ne.jp
いちびこ農園 — farm shop · sells: strawberry
9 km · ichibiko-farm.com
有限会社マルサ村松商店 — farm shop
9 km · marusa-muramatsu.com
株式会社コンファーム — farm shop
9 km · confarm.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