The answer to 'why is my gutter discolored' is that gutters can become discolored for a variety of reasons, including dirt, debris, and mineral buildup. Discoloration is a common issue that homeowners face, but it's usually not a sign of a serious problem.
Some common causes of gutter discoloration include leaves, twigs, and other organic matter that accumulate over time, as well as minerals and hard water deposits that can leave behind stains. In some cases, mold or mildew growth can also lead to discoloration. While unsightly, discolored gutters are typically not a structural issue and can often be cleaned with some basic maintenance.