When to plant zucchini in San Sebastián: 8 June – 16 September

In San Sebastián, zucchini: sow for seedlings from 27 April to 26 August; plant into a greenhouse from 18 May to 16 September; plant out into open ground from 8 June to 16 September. For plants and seeds, the places nearby include Loraldi (garden centre, 6 km) and Alkartasuna Baserritarren Kooperatiba (farm supply, 8 km); addresses and opening hours are below.

Zucchini in San Sebastián: soil, season and weather

In San Sebastián the soil, not frost, sets the date: the last frost is over around 22 January, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 8 June, 137 days later.

Last spring frost	22 January
Top 7 cm of soil at 18 °C	8 June, 137 days after the last frost
First autumn frost	3 December, 178 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	14 July – 22 October
Days left for picking	142
Daylight	14:46 on 18 May, 15:18 on 8 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 13 rainy days

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

Zucchini in San Sebastián: care after planting

Planted on 8 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in San Sebastián during the zucchini season

About 966 mm of rain falls in the season; July is the driest month (73 mm) and November the wettest (230 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.3	14.2	109	14	15:23
July	22.7	16	73	13	15:06
August	23.6	16.3	99	12	14:00
September	22.1	14.3	127	13	12:33
October	19.7	12.4	139	13	11:05
November	14.7	8.6	230	18	9:44
December	12.8	6.9	189	15	9:00

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

All the nearest cities on our list plant zucchini earlier than San Sebastián; the closest date is in Vitoria-Gasteiz, 4 days earlier.

City	Distance	Date	Difference
Bayonne	45 km	28 May – 30 September	11 days earlier
Pamplona	63 km	1 June – 13 September	7 days earlier
Vitoria-Gasteiz	77 km	4 June – 7 September	4 days earlier
Bilbao	77 km	2 June – 9 October	6 days earlier
Logroño	102 km	28 May – 17 September	11 days earlier
Pau	131 km	2 June – 17 September	6 days earlier

Where to buy zucchini plants and seeds near San Sebastián

Buy plants ready to set out from 8 June to 16 September (from 18 May to 16 September for an unheated greenhouse); seed for raising your own is sown from 27 April to 26 August. Within 15 km of San Sebastián OpenStreetMap lists 4 garden centres, 3 farm-supply shops, 6 markets and 4 farm shops (collected 27 October 2026).

Lorea — farm shop
3 km
Endanea Garden Center — garden centre
Jaitzubia auzoa 40, 20280 Hondarribia · 13 km · endanea.com
Loraldi — garden centre
Iparralde bidea, 20115 Astigarraga · 6 km · loraldi.com
Alkartasuna Baserritarren Kooperatiba — farm supply
Atallu kalea 26 · Mon–Fri 09:00–13:00, 16:00–19:30; Sat 09:00–13:00 · 8 km · alkartasuna.eus

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