Keep in mind when planting that Fat Bastard is thought of as hardy, so this plant will grow or become dormant during the winter.
Soil temperature should be kept higher than
21°C / 70°F to ensure good germination.
By our calculations, you should look at sowing Fat Bastard about 90 days before your last frost date.
As Fat Bastard is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.