Along the Colorado Front Range the calendar makes this easy. Late spring brings cottonwood fluff that mats into a felt like blanket, and the pines drop needles all season, so most homes want a clean in late spring and again in the fall once the leaves are down. Intense high altitude UV bakes that debris into a hard crust, hail knocks loose granules off the shingles that wash straight into the trough, and wildfire smoke haze leaves a fine ash film that sets up with the first rain. Then winter arrives. Freeze thaw cycles turn a clogged gutter into an ice dam, and meltwater backs up under the shingles, over the fascia and down the siding. Road sand and magnesium chloride de icer thrown up through the neighborhood adds grit and salt residue that speeds corrosion in the seams. Book gutter cleaning services in the south Denver metro before that first hard freeze and you avoid the expensive version of this problem.