GreenlyWhen to plant watermelon in Leeds
In Leeds, watermelon: sow seedlings around 3 May for the greenhouse and around 24 May for open ground; plant into a greenhouse around 4 June; plant out into open ground around 25 June.
Last spring frost around 18 April, first autumn frost around 23 November. Frost-free days: 219 days.
The dates follow the Greenly calendar: open ground a week after the last frost once the soil is warm enough for the crop, frost-hardy crops three weeks before it, an unheated greenhouse three weeks earlier, seedlings sown so they are ready on the day. In a cold year allow a week or two more.