GreenlyWhen to plant zucchini in Ottawa
In Ottawa, zucchini: sow seedlings around 4 April for the greenhouse and around 25 April for open ground; plant into a greenhouse around 6 May; plant out into open ground around 27 May.
Last spring frost around 30 April, first autumn frost around 1 November. Frost-free days: 185 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.