What to plant in June in the UK

Worked out for 40 cities from their own weather and frost dates, by zone.

What to sow and plant in June in the UK, by zone: frost-free, highs of 16–22 °C (London, Manchester and 38 more): broad bean, peas, onion, lettuce, radish and 21 more.

In the UK, June is summer.

Frost-free, highs of 16–22 °C: London, Manchester, Edinburgh, Birmingham and 36 more

In June, on average, these cities have highs of 16 to 21 °C and lows of 9 to 14 °C, 53 to 107 mm of rain on 9 to 17 days; the day lasts 16 h 24 min to 17 h 59 min (on the 15th).

No frost in June in 10 years of data: frost-tender crops can go in too, if it is warm enough for them.

How	What	Where
sow direct	Broad bean, peas, lettuce, carrot, cabbage, broccoli, Swiss chard, beet, zucchini, green beans, parsley, cilantro, arugula, chamomile, dill, kale, kohlrabi, mustard greens, parsnip	all
plant sets	Onion, shallot	all
sow direct	Spinach	Manchester, Edinburgh, Glasgow and 15 more
sow direct	Radish	Manchester, Edinburgh, Birmingham and 36 more
start indoors, plant out in July	Cauliflower	all
start indoors, plant out in August	Leek	Manchester, Edinburgh, Birmingham and 28 more
start indoors, plant out in July	Cucumber, melon, watermelon, pumpkin, basil, achocha, peanut	London, Southampton, Oxford and 5 more
sow direct	Sweet Corn, bok choy, borage, chayote, chickpea, corn, Florence fennel, kiwano, Napa cabbage	London, Bristol, Leicester and 10 more
start indoors, plant out in August	Brussels Sprouts	all
sow direct	Daikon	Manchester, Edinburgh, Birmingham and 24 more
start indoors, plant out in July	Chicory	Plymouth, Aberdeen, Stirling and 1 more
sow direct	Turnip	Plymouth, Aberdeen, Stirling and 1 more

Compared with May: no longer sown — bell pepper, eggplant, chili pepper and moringa.

Not starting in June: tomato (March, started indoors) and bell pepper (no month outdoors by these rules) — dates for Stoke-on-Trent.

Ready to harvest in June in Stoke-on-Trent, if sown in the right month: broad bean (March), peas (April), spinach (April), lettuce (April), radish (May), carrot (April), Swiss chard (April) and beet (April).

How we work it out

For each city we use its average weather in June and the months after (highs, lows and rain for 2016–2025, ERA5 reanalysis via Open-Meteo) and its average frost dates. A crop starts in June if the month's mean temperature reaches the minimum soil temperature for germination on its card (we use the mean air temperature as a stand-in for the soil's) and if, over its first months (up to three), the average highs stay within its group's range, with no frost for crops that cannot take it. Crops started indoors count from the month they are planted out.

Temperature groups from Colorado State University Extension: cool-season crops prefer 16–27 °C and lose quality in heat; hardy ones grow in days as cool as 4 °C, semi-hardy ones from 4–10 °C (we use 10 °C); warm-season crops need days above 13 °C, and the most tender (tomato, pepper, aubergine, melon, watermelon, squash) above 16 °C, up to 35 °C. Crops the guide does not name go into the stricter group by their frost hardiness. Broad beans, which the guide does not name, count as hardy: hardy varieties are sown in autumn and overwinter (RHS). Garlic and bulbs: a month before the first frost, and later only while the ground is not frozen (as on each city's page). French beans, courgettes and outdoor tomatoes follow the RHS instead, in months without frost: French beans and courgettes sown outdoors in late May or early June, courgettes also started indoors in April or May; tomatoes started indoors from late March to early April and planted out in June where its average highs reach 16 °C.

This is a general rule from averages: your garden can be a week or two earlier or later, and a greenhouse or a cold frame brings the season forward. Greenly works out the dates for your location.

What to plant in June in the UK

Frost-free, highs of 16–22 °C: London, Manchester, Edinburgh, Birmingham and 36 more

How we work it out

Other months in the UK