Keep in mind when planting that Rocky Mountain Salmon is thought of as half hardy, so remember to protect this plant from frosts and low temperatures. Ensure your soil has a ph of between 6.0 and 6.5 as Rocky Mountain Salmon is a weakly acidic soil loving plant.
By our calculations, you should look at sowing Rocky Mountain Salmon about 105 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Rocky Mountain Salmon is a half hardy plant.