To freeze it unbaked, wrap the loaf pan tightly in plastic wrap and freeze it until you're ready to use (up to 3 months.) To bake the frozen meatloaf there is no need to thaw it, simply transfer it frozen to the oven and bake as per instructions, adding 10 more minutes to the total cooking time. To freeze it baked, let it cool to room temperature first. You can slice it and transfer the pieces to a freezer-safe container, layering parchment paper between each slice to prevent them from sticking. Or wrap it whole (with the loaf pan) tightly in plastic wrap. Freeze for up to 3 months, and let thaw overnight in the fridge before reheating.