GreenlyWhen to plant watermelon in Concepción
In Concepción, watermelon: sow seedlings around 14 October for the greenhouse and around 4 November for open ground; plant into a greenhouse around 15 November; plant out into open ground around 6 December.
Last spring frost around 19 July, first autumn frost around 13 June. Frost-free days: 329 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.