The process for installing grass inside Lumen Field before the 2026 FIFA Men’s World Cup has started. Doing so has meant burying the FieldTurf surface used by the Seahawks, Sounders and Reign — literally.

Work started the final week of February on installing the foundation for what will eventually be a grass surface used for six World Cup matches scheduled to take place at Lumen Field between mid June and early July, beginning with the June 15 match between Belgium and Egypt.

But rather than removing the FieldTurf, FIFA is opting to build the grass surface on top of the current artificial field.