By our calculations, you should look at sowing Ultra red star about 77 days before your last frost date.
As with all petunias this variety will self seed readily. Unwanted seedlings can be prevented by deadheading flowers as soon as they wilt. This will prevent the formation of the seed pods and encourage more flowering.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Ultra red star is a half hardy plant.petunia