The best way to protect your plants from frost is to make use of natural protections. This means selecting frost-tolerant plants, planting delicate plants close to buildings, and using mulch to help the ground retain heat and protect delicate root systems.
When there is a predicated frost, you can move potted plants indoors overnight and use appropriate coverings for outdoor plants that cannot be moved. Coverings include sheets, blankets, newspapers, cardboard boxes, or plastic. Plastic coverings should be removed immediately the next day while the other coverings can be left for 2-3 days.