GreenlyWhen to plant watermelon in Austin
In Austin, watermelon: sow seedlings around 9 January for the greenhouse and around 30 January for open ground; plant into a greenhouse around 10 February; plant out into open ground around 3 March.
Last spring frost around 19 February, first autumn frost around 13 December. Frost-free days: 297 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.