Keep in mind when planting that Rocket white is thought of as very hardy, so this plant will typically do well in a variety of different extremes of cold temperature. Planting Rocket white in loamy soil with a ph of between 6.0 and 7.0 is ideal for as it does best in weakly acidic soil to neutral soil.
By our calculations, you should look at sowing Rocket white about 56 days before your last frost date.
As Rocket white is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.