Aim to sow
0.25 inches (0.64 cm) deep and try to ensure a gap of at least
2.97 inches (7.62 cm). Soil temperature should be kept higher than
13°C / 55°F to ensure good germination.
By our calculations, you should look at sowing White Russian about 49 days before your last frost date.
As White Russian is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.