Yes! The uncooked patties (before grilling) freeze really well.  Simply make the patties and line a freezer proof container with baking paper. Place a layer of the uncooked patties on the paper and place another sheet of paper on top. Lay another layer of patties gently  down and repeat until you've used all your patties. Seal the container and write the name of the recipe and the date made on a label and attach. Pop the burgers in the freezer for up to 3 months. To thaw, remove the patties from the freezer and either leave them on the counter for a few hours or thaw them in the fridge for around 24 hours. Grill when thawed.