GreenlyWhen to plant watermelon in Edmonton
In Edmonton, watermelon: sow seedlings around 5 May for the greenhouse and around 26 May for open ground; plant into a greenhouse around 6 June; plant out into open ground around 27 June.
Last spring frost around 7 May, first autumn frost around 6 October. Frost-free days: 152 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.