When to plant cucumbers in San Sebastián: 8 June – 18 September

In San Sebastián, cucumber: sow for seedlings from 20 April to 21 August; plant into a greenhouse from 18 May to 18 September; plant out into open ground from 8 June to 18 September. For plants and seeds, the places nearby include Frutería Maribel (farm shop, 0 km) and Olasagasti (farm shop, 6 km); addresses and opening hours are below.

Cucumber 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 cucumber 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
Into an unheated greenhouse	18 May – 18 September; May outside: 10.7 °C at night, 18.2 °C by day; card 18–25 °C
First autumn frost	3 December, 178 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	12 July – 22 October
Days left for picking	144
Daylight	14:31 on 11 May, 15:18 on 8 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, July, has 13 rainy days

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

Cucumber in San Sebastián: care after planting

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

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

15 June — feed: nitrogen

Pests and diseases of cucumber 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 San Sebastián during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 23.6 °C. Months that stay below 18 °C even by day on average: November (14.7 °C) and December (12.8 °C). Nights average below 18 °C in every month of the season, from 6.9 °C to 16.3 °C.

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

Cucumber in nearby cities

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

City	Distance	Date	Difference
Bayonne	45 km	28 May – 2 October	11 days earlier
Pamplona	63 km	1 June – 15 September	7 days earlier
Vitoria-Gasteiz	77 km	4 June – 9 September	4 days earlier
Bilbao	77 km	2 June – 11 October	6 days earlier
Logroño	102 km	28 May – 19 September	11 days earlier
Pau	131 km	2 June – 19 September	6 days earlier

Where to buy cucumber plants and seeds near San Sebastián

Buy plants ready to set out from 8 June to 18 September (from 18 May to 18 September for an unheated greenhouse); seed for raising your own is sown from 20 April to 21 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).

Alde Zaharreko Azoka — market
09:00–14:00 · 0 km
karabeleko ekodenda — farm shop
Portu 34, 20120 Hernani · 6 km
Frutería Maribel — farm shop
Aldamar kalea 10, 20003 Donostia / San Sebastián · 0 km
Olasagasti — farm shop
Akarregi 12, 20120 Hernani · 6 km

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.

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