When to plant cucumbers in Siena: 26 May – 12 September

In Siena, cucumber: sow for seedlings from 7 April to 15 August; plant into a greenhouse from 5 May to 12 September; plant out into open ground from 26 May to 12 September. For plants and seeds, the places nearby include Azienda Agricola Lombardo (farm supply, 2 km) and Consorzio Agrario di Arbia (farm supply, 7 km); addresses and opening hours are below.

Cucumber in Siena: soil, season and weather

In Siena the soil, not frost, sets the date: the last frost is over around 16 March, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 26 May, 71 days later.

Last spring frost	16 March
Top 7 cm of soil at 18 °C	26 May, 71 days after the last frost
Into an unheated greenhouse	5 May – 12 September; May outside: 11 °C at night, 22.5 °C by day; card 18–25 °C
First autumn frost	27 November, 185 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	29 June – 16 October
Days left for picking	151
Daylight	13:59 on 28 April, 15:01 on 26 May
Watering outdoors when fruiting (card)	every 2 days; the driest month, July, has 4 rainy days

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

Cucumber in Siena: care after planting

Planted on 26 May: in the first weeks water every 4 days.

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

2 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 Siena during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 32.5 °C. Months that stay below 18 °C even by day on average: November (15.2 °C). Nights average below 18 °C in May, June and September–November (6.2–16 °C).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
May	22.5	11	91	12	14:40
June	29.1	16	41	7	15:23
July	32.5	18.8	22	4	15:06
August	32.4	18.9	35	6	14:00
September	26.5	14.8	77	8	12:33
October	21.4	10.9	97	8	11:05
November	15.2	6.2	107	12	9:44

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Siena, Livorno is 10 days earlier and Pisa 21 days later.

City	Distance	Date	Difference
Arezzo	47 km	9 June – 6 September	14 days later
Florence	50 km	28 May – 12 September	2 days later
Livorno	84 km	from 16 May	10 days earlier
Pisa	87 km	16 June – 3 September	21 days later
Perugia	89 km	29 May – 10 September	3 days later
San Marino	113 km	16 May – 27 September	10 days earlier

Where to buy cucumber plants and seeds near Siena

Buy plants ready to set out from 26 May to 12 September (from 5 May to 12 September for an unheated greenhouse); seed for raising your own is sown from 7 April to 15 August. Within 15 km of Siena OpenStreetMap lists 3 garden centres, 2 farm-supply shops, 4 plant nurseries, 6 markets and 1 farm shop (collected 27 October 2026).

Consorzio Agrario di Arbia — farm supply
Via Aretina 17, 53041 Arbia · 7 km · consorziagrariditalia.it
Azienda Agricola Lombardo — farm supply
Via Aretina 113, 53100 Siena · 2 km
Mercato dell'Antiquariato — market
Piazza del Mercato, 53100 Siena · Sun[3] · 0 km
Mercato delle Merci — market
Viale Venticinque Aprile, 53100 Siena · Wed 08:00–13:30 · 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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