Keep in mind when planting that Endurio Tricolor Mix is thought of as hardy, so this plant will survive close to or on freezing temperatures.
By our calculations, you should look at sowing Endurio Tricolor Mix about 90 days before your last frost date.
As Endurio Tricolor Mix is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.