Toad lilies generally are late summer and fall bloomers.

All of the Tricyrtis species (Toad lily) bloom in late summer or fall. Some species(cultivars) are earlier than others, you probably have one of those.

are you thinking of the wildflower, toadshade? that is springblooming, but it also dies down by summer.

All I know is I am excited to see these interesting flowers so soon. When I buy late in the season at clearance prices I assume I have missed the plants peek for the season. How exciting to be wrong. I need to go back to the books and see where my mind went astray. For now I am enjoying these spotted beauties! I am not too worried about it being invasive either. All it means to me is I will have plenty to divide and spread around my two acres sooner then hoped for.