All of our perennials are grown in our area. Most that we carry are hardy from zones 3 to 5. If you look at a zone map it will show that we are zone 5. Yet there are areas that are much colder, and some that are much warmer. Also winter conditions from one year to the next will vary.
Some perennials are very long lived, and some short.
It is helpful to know which ones will fade away after several years, so that new ones can be planted. A perennial is generally a plant that lives 3 years or more. But that does not mean that you can't plant them later. The most important thing is that they are kept well watered until they are established. If spent flowers are removed, some perennials will rebloom, plus it keeps them neater looking in the garden.