GreenlyWhen to plant garlic in Washington, D.C.
In Washington, D.C., garlic: plant around 17 October, a month before the first autumn frost.
Last spring frost around 31 March, first autumn frost around 16 November. Frost-free days: 230 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.