It depends! Temperature ratings are extremely subjective, so be sure to consider your individual needs when determining which sleeping bag is most appropriate for you. In addition to that temperature rating, look at the fill quality, fill weight, fabric, and bag shape, then consider your own metabolism, sleep system, and even willingness to be uncomfortable. While our temperature ratings are fairly conservative, they may not apply to every experience. Our page onchoosing a sleeping baghas some great information on all of the factors that impact your warmth, which can help you plan for success in staying warm outdoors. We generally recommend that you get a sleeping bag rated to 10 to 20 degrees fahrenheit (~6 to 11 degrees celcius) colder than the coldest temperatures you expect to encounter, so if you think you’ll regularly be camping in 20°F, go for a 10°F or 0°F bag. Be self-aware, and choose wisely!