The answer to 'when to clean gutter' is that gutters should be cleaned at least twice a year, in the spring and fall. Cleaning your gutters regularly helps prevent clogs, water damage, and pest infestations. In the spring, remove leaves, twigs, and other debris that accumulated over the winter. In the fall, clear out leaves and other organic matter before winter storms arrive.
Proper gutter maintenance is important for protecting your home's foundation, siding, and landscaping. Clogged gutters can cause water to overflow and pool around your home's perimeter, leading to moisture problems, rot, and even foundation cracks. Regular cleaning also helps avoid ice dams in the winter that can damage your roof.