brisket done temperature
1 Cook the brisket fat-side down at 325-375Â°F for 2 to 2-1/2 hours to an internal temperature of 170Â°F. 2  Wrap in foil fat-side up and cook another 2 to 2-1/2 hours until fork tender.3  Rest in foil for 30 minutes before slicing. Cook the brisket fat-side down at 325-375Â°F for 2 to 2-1/2 hours to an internal temperature of 170Â°F. 2  Wrap in foil fat-side up and cook another 2 to 2-1/2 hours until fork tender.