Freezing food can be a great money saver and keep foods at their most delicious (just be sure to label and date everything!)
The best way to freeze citrus is to freeze the juice in ice-cube trays until solid, then transfer the cubes to a freezer bag. Freeze it in 1- to 2-Tbsp. portions―it should keep indefinitely. Thaw at room temperature or in the fridge (or use lemon cubes in iced tea). You can also freeze the zest: Zest the fruit onto a sheet of plastic wrap, wrap tightly and place in a freezer bag.