"We are deeply disappointed by this difficult decision, one that impacts our fans and our incredible team of performers, crew, vendors and our community in Dover, Delaware," officials said in a statement.
The four-day festival was set to return to The Woodlands for its ninth year June 18 - 21. Billie Eilish, Halsey, Khalid, Blink 182 and Maggie Rogers were among the scheduled performers.
All Firefly ticket holders who purchased tickets through Elevate will receive a full refund. You can also choose to transfer your ticket to Firefly 2021.