When to plant cucumbers in Bayonne: 28 May – 2 October

In Bayonne, cucumber: sow for seedlings from 9 April to 4 September; plant into a greenhouse from 7 May to 2 October; plant out into open ground from 28 May to 2 October. For plants and seeds, the places nearby include Maÿ (garden centre, 1 km) and Point Vert (garden centre, 3 km); addresses and opening hours are below.

Cucumber in Bayonne: soil, season and weather

In Bayonne the soil, not frost, sets the date: the last frost is over around 26 January, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 28 May, 122 days later.

Last spring frost	26 January
Top 7 cm of soil at 18 °C	28 May, 122 days after the last frost
Into an unheated greenhouse	7 May – 2 October; May outside: 12.2 °C at night, 19.6 °C by day; card 18–25 °C
First autumn frost	17 December, 203 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	1 July – 5 November
Days left for picking	169
Daylight	14:05 on 30 April, 15:05 on 28 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, July, has 10 rainy days

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

Cucumber in Bayonne: care after planting

Planted on 28 May: in the first weeks water every 4 days.

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

4 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 Bayonne during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, August, averages 25.3 °C. Months that stay below 18 °C even by day on average: November (15.7 °C) and December (13.5 °C). Nights average below 18 °C in every month of the season, from 7 °C to 17.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	19.6	12.2	110	15	14:41
June	22.9	15.8	113	13	15:24
July	24.4	17.5	63	10	15:07
August	25.3	17.8	71	10	14:00
September	23.4	15.5	121	13	12:33
October	20.8	12.9	115	13	11:05
November	15.7	8.7	218	16	9:43
December	13.5	7	172	14	8:59

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

All the nearest cities on our list plant cucumber later than Bayonne; the closest date is in Pamplona, 4 days later.

City	Distance	Date	Difference
San Sebastián	45 km	8 June – 18 September	11 days later
Pamplona	77 km	1 June – 15 September	4 days later
Pau	92 km	2 June – 19 September	5 days later
Vitoria-Gasteiz	121 km	4 June – 9 September	7 days later
Bilbao	121 km	2 June – 11 October	5 days later
Jaca	129 km	19 June – 16 August	22 days later

Where to buy cucumber plants and seeds near Bayonne

Buy plants ready to set out from 28 May to 2 October (from 7 May to 2 October for an unheated greenhouse); seed for raising your own is sown from 9 April to 4 September. Within 15 km of Bayonne OpenStreetMap lists 13 garden centres, 1 farm-supply shop, 20 markets and 34 farm shops (collected 27 October 2026).

Point Vert — garden centre
Mon–Sat 09:00–12:00, 14:00–19:00 · 3 km · monmagasinvert.fr
Jardiland — garden centre
Mon–Sat 09:30–19:00; Sun 10:00–12:30, 14:30–19:00 · 5 km · jardiland.com
Sicanam — garden centre
Tue–Fri 09:00–12:00, 14:00–18:00; Sat 09:00–12:00 · 10 km
Maÿ — garden centre
Tue–Sat 10:00–13:00, 14:00–19:00 · 1 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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