When does A Court of Thorns and Roses return?

A Court of Thorns and Roses is an adult fantasy series by American author Sarah J. Maas. It follows the journey of Feyre Archeron after she is brought into the faerie lands of Prythian. The first book of the series was released in May 2015. The series is a New York Times Best Seller and has been optioned by Hulu for a television series adaptation by Ronald D. Moore.