Keep in mind when planting that Forkhook tall mix is thought of as very hardy, so this plant will tend to survive through freezing conditions. Planting Forkhook tall mix 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 Forkhook tall mix about 56 days before your last frost date.
As Forkhook tall mix is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.