When to plant cucumbers in Oxford: 23 June – 8 September

In Oxford, cucumber: sow for seedlings from 5 May to 11 August; plant into a greenhouse from 2 June to 8 September; plant out into open ground from 23 June to 8 September.

Cucumber in Oxford: soil, season and weather

In Oxford the soil, not frost, sets the date: the last frost is over around 3 April, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 23 June, 81 days later.

Last spring frost	3 April
Top 7 cm of soil at 18 °C	23 June, 81 days after the last frost
Into an unheated greenhouse	2 June – 8 September; June outside: 11.3 °C at night, 20.4 °C by day; card 18–25 °C
First autumn frost	23 November, 153 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	27 July – 12 October
Days left for picking	119
Daylight	16:07 on 26 May, 16:41 on 23 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 10 rainy days

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

Cucumber in Oxford: care after planting

Planted on 23 June: in the first weeks water every 4 days.

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

30 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 Oxford during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 22.2 °C. Months that stay below 18 °C even by day on average: October (14.9 °C) and November (10.4 °C). Nights average below 18 °C in every month of the season, from 4.7 °C to 13.3 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.4	11.3	59	11	16:39
July	22.2	13.3	64	12	16:15
August	21.8	13	55	10	14:41
September	19.2	10.9	69	11	12:43
October	14.9	8.4	83	12	10:45
November	10.4	4.7	77	12	8:52

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

All the nearest cities on our list plant cucumber earlier than Oxford; the closest date is in Coventry, 2 days earlier.

City	Distance	Date	Difference
Coventry	75 km	21 June – 2 September	2 days earlier
Worcester	82 km	19 June – 7 September	4 days earlier
London	82 km	12 June – 8 September	11 days earlier
Birmingham	93 km	20 June – 4 September	3 days earlier
Southampton	95 km	17 June – 8 September	6 days earlier
Bristol	98 km	19 June – 7 September	4 days earlier

Where to buy cucumber plants and seeds near Oxford

Buy plants ready to set out from 23 June to 8 September (from 2 June to 8 September for an unheated greenhouse); seed for raising your own is sown from 5 May to 11 August. Within 15 km of Oxford OpenStreetMap lists 10 garden centres, 6 markets and 8 farm shops (collected 20 October 2026).

South Oxford Farmers and Community Market — market
Lake Street, Oxford · Sun 09:30–12:00 · 1 km · southoxfordfarmersmarket.org.uk
Gloucester Green Market — market
Gloucester Green, Oxford · Wed 09:00–16:00, Thu–Fri 10:00–16:00; Sat 09:00–17:00 · 1 km
East Oxford Farmers' and Community Market — market
Sat 10:00–13:00 · 2 km · eastoxfordmarket.org.uk
Summertown Farmers' Market — market
Sun 10:00–14:00; public holidays closed · 3 km · summertown.info

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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