When to plant cucumbers in Southampton: 17 June – 8 September

In Southampton, cucumber: sow for seedlings from 29 April to 11 August; plant into a greenhouse from 27 May to 8 September; plant out into open ground from 17 June to 8 September. For plants and seeds, the places nearby include Fair Oak Garden Centre (garden centre, 11 km) and Brambridge Park Garden Centre (garden centre, 12 km); addresses and opening hours are below.

Cucumber in Southampton: soil, season and weather

In Southampton the soil, not frost, sets the date: the last frost is over around 4 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 17 June, 74 days later.

Last spring frost	4 April
Top 7 cm of soil at 18 °C	17 June, 74 days after the last frost
Into an unheated greenhouse	27 May – 8 September; May outside: 8.2 °C at night, 17.4 °C by day; card 18–25 °C
First autumn frost	23 November, 159 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	21 July – 12 October
Days left for picking	125
Daylight	15:44 on 20 May, 16:31 on 17 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, July, has 10 rainy days

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

Cucumber in Southampton: care after planting

Planted on 17 June: in the first weeks water every 4 days.

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

24 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 Southampton during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 22.3 °C. Months that stay below 18 °C even by day on average: October (15.4 °C) and November (11.1 °C). Nights average below 18 °C in every month of the season, from 5.2 °C to 13.5 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.5	11.5	59	11	16:30
July	22.3	13.5	54	10	16:06
August	21.8	13.3	60	10	14:36
September	19.2	11.2	73	11	12:42
October	15.4	8.8	100	13	10:47
November	11.1	5.2	86	13	8:58

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Southampton, London is 5 days earlier and Brighton 33 days later.

City	Distance	Date	Difference
Portsmouth	24 km	16 June – 16 September	1 day earlier
Brighton	89 km	20 July – 16 September	33 days later
Oxford	95 km	23 June – 8 September	6 days later
Bristol	103 km	19 June – 7 September	2 days later
London	111 km	12 June – 8 September	5 days earlier
Cardiff	140 km	24 June – 7 September	7 days later

Where to buy cucumber plants and seeds near Southampton

Buy plants ready to set out from 17 June to 8 September (from 27 May to 8 September for an unheated greenhouse); seed for raising your own is sown from 29 April to 11 August. Within 15 km of Southampton OpenStreetMap lists 28 garden centres, 15 plant nurseries, 1 market and 10 farm shops (collected 20 October 2026).

Fair Oak Garden Centre — garden centre
Winchester Road, SO50 7HD Winchester · 11 km · thegardencentregroup.co.uk
Brambridge Park Garden Centre — garden centre
Kiln Lane, Brambridge, SO50 6HT Winchester · 12 km · bluediamond.gg
Jobs Cottage Nursery — garden centre
Durley Hall Lane, Southampton · 12 km · jobscottage.co.uk
Nightingale Nursery — garden centre
Mon–Fri 09:00–16:00 · 12 km · nightingalenursery.co.uk

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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