Guttering by Gary's recommends having your gutters cleaned at twice a year, with late spring to late summer being the best times.
Your gutters accumulate winter debris and when pollen is in the air, it can clog your gutters and provide a perfect breeding ground for mosquito larva. Also, summer is full of thunderstorms, strong winds and even drought which can all contribute to large amount of leaves, sticks, and debris in your gutters.
Early to Late Fall is very important because once winter hits and temperatures go below freezing, we cannot do any cleaning until temperatures go above freezing for a 72 hour time frame. Once ice freezes in your gutters it can damage your home which may cause seams in the downspouts to burst. The weight of ice is heavier than water which can rip the gutters off your house, including entire soffits!! The cost of a gutter cleaning is much less than a gutter replacement! Please have your gutters cleaning at least twice a year!