All tires will need to be replaced at some point. Generally, all-terrain tires will need to be replaced before touring tires, due to their more aggressive tread pattern. Depending on the climate of the area you live in, A/T tires can last anywhere from 3-5 seasons. If you want to extend the life of your tires, consider having two sets of tires for the winter and summer seasons. This also depends on what area you live. Either way, be sure to check the tread depth of your tires regularly and replace them when they become worn.