Keep in mind when planting that Early Splendor is thought of as tender, so it is really important to ensure that the outside temperature is well above freezing before planting or moving outdoors.
By our calculations, you should look at sowing Early Splendor about 28 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Early Splendor is a tender plant.