They can depending on what part of the country you live in we all have Mother Nature to contrnd with. Up here in New England we have the winters, in the south you have the sun. We dont believe that they should be left out all the time and any company that says that is just hoping you will call to place another order in 5 years. The 1 year limited warranty is void if the flag is placed outside. There is no finish that will last more than 3-5 years outside and we build our flags o last way longer than that.