Although frozen hamburger patties can take longer to cook, it is still safe to grill them without having to thaw them. To grill the hamburgers, preheat the grill on low, remove the patties from freezer and arrange them on a plate. Using either a gas or charcoal grill, place the patties on the grill and cook the frozen burgers between low and medium heat.
Frozen burgers can take from 20 to 25 minutes of grilling time. However, grilling time can depend on the specific type of grill used. It also is important to flip the burgers at least four times while they are grilling. To ensure that the burger is cooked thoroughly, the minimum internal meat temperature should be about 160 degrees Fahrenheit.