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When to plant cucumbers in the United Kingdom: 12 Jun – 16 Sept

Cucumber in the United Kingdom: plant out into open ground from 12 June to 16 September; the window opens earliest in London and closes latest in Swansea (40 cities).

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.

Planting window by climate zone

ZoneCitiesWindow
270 frost-free days or moreSwansea, Brighton, Plymouth, Portsmouth16 June – 16 September
210–269 frost-free daysLondon, Bristol, Leeds, Cardiff, Belfast, Liverpool, Sheffield, Newcastle upon Tyne, Leicester, Bradford, Coventry, Nottingham, Hull, Derby, Southampton, Aberdeen, Oxford, York, Cambridge, Norwich, Exeter, Derry, Wrexham, Lincoln (United Kingdom), Ipswich, Worcester12 June – 14 September
150–209 frost-free daysManchester, Edinburgh, Birmingham, Glasgow, Dundee, Inverness, Stirling, Perth (United Kingdom), Carlisle, Stoke-on-Trent20 June – 4 September

Cucumber: the window in each city

CityWindowZone
London12 June – 8 September210–269 frost-free days
Ipswich14 June – 14 September210–269 frost-free days
Portsmouth16 June – 16 September270 frost-free days or more
Cambridge17 June – 9 September210–269 frost-free days
Liverpool17 June – 11 September210–269 frost-free days
Southampton17 June – 8 September210–269 frost-free days
Bristol19 June – 7 September210–269 frost-free days
Worcester19 June – 7 September210–269 frost-free days
Birmingham20 June – 4 September150–209 frost-free days
Nottingham20 June – 8 September210–269 frost-free days
Stoke-on-Trent20 June – 31 August150–209 frost-free days
Coventry21 June – 2 September210–269 frost-free days
Leicester21 June – 4 September210–269 frost-free days
Swansea21 June – 16 September270 frost-free days or more
Derby22 June – 7 September210–269 frost-free days
Exeter23 June – 12 September210–269 frost-free days
Oxford23 June – 8 September210–269 frost-free days
Cardiff24 June – 7 September210–269 frost-free days
Leeds25 June – 8 September210–269 frost-free days
Lincoln (United Kingdom)25 June – 4 September210–269 frost-free days
Newcastle upon Tyne26 June – 5 September210–269 frost-free days
York26 June – 30 August210–269 frost-free days
Bradford27 June – 3 September210–269 frost-free days
Hull27 June – 9 September210–269 frost-free days
Norwich27 June – 13 September210–269 frost-free days
Manchester28 June – 30 August150–209 frost-free days
Sheffield29 June – 7 September210–269 frost-free days
Wrexham5 July – 8 September210–269 frost-free days
Edinburgh6 July – 25 August150–209 frost-free days
Belfast7 July – 4 September210–269 frost-free days
Stirling11 July – 25 August150–209 frost-free days
Derry13 July – 6 September210–269 frost-free days
Carlisle15 July – 31 August150–209 frost-free days
Inverness17 July – 29 August150–209 frost-free days
Plymouth17 July – 16 September270 frost-free days or more
Aberdeen19 July – 5 September210–269 frost-free days
Perth (United Kingdom)19 July – 27 August150–209 frost-free days
Brighton20 July – 16 September270 frost-free days or more
Dundee21 July – 28 August150–209 frost-free days
Glasgow21 July – 27 August150–209 frost-free days