When to plant zucchini in Bayonne: 28 May – 30 September

In Bayonne, zucchini: sow for seedlings from 16 April to 9 September; plant into a greenhouse from 7 May to 30 September; plant out into open ground from 28 May to 30 September.

Zucchini 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 zucchini 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
First autumn frost	17 December, 203 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	3 July – 5 November
Days left for picking	167
Daylight	14:23 on 7 May, 15:05 on 28 May
Watering outdoors when fruiting (card)	every 3 days; the driest month, July, has 10 rainy days

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

Zucchini in Bayonne: care after planting

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

Pests and diseases of zucchini to watch for:

Weather in Bayonne during the zucchini season

About 983 mm of rain falls in the season; July is the driest month (63 mm) and November the wettest (218 mm).

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

Zucchini in nearby cities

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

City	Distance	Date	Difference
San Sebastián	45 km	8 June – 16 September	11 days later
Pamplona	77 km	1 June – 13 September	4 days later
Pau	92 km	2 June – 17 September	5 days later
Vitoria-Gasteiz	121 km	4 June – 7 September	7 days later
Bilbao	121 km	2 June – 9 October	5 days later
Jaca	129 km	19 June – 14 August	22 days later

Where to buy zucchini plants and seeds near Bayonne

Buy plants ready to set out from 28 May to 30 September (from 7 May to 30 September for an unheated greenhouse); seed for raising your own is sown from 16 April to 9 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).

Marché de Labenne — market
Place de la République, 40530 Labenne · Thu 16:30–19:30 · 12 km
Marché de Biaudos — market
Route du Bourg, 40390 Biaudos · Sun 09:00–13:00 · 15 km
Halle aux Poissons — market
Mon–Sun 07:30–14:00 · 8 km
Marché place du Marquisat — market
Fri 08:00–13:00 · 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.

Questions