Having those perfectly shaped patties in the freezer ready to go when you are eliminates the hassle of doing all the prep work yourself. You may have noticed that these discs of frozen meat are not as juicy as the fresh ones. To get that homemade texture, set your grill to 350 degrees Fahrenheit. Frozen hamburger patties were created to go from the freezer to the grill. To put it in Goldilocks' terms: 350 degrees is just right.