Twice a year is the standard answer. In the older Bergen boroughs, where street trees were planted a century ago and have been growing ever since, it's a floor.
The Baseline
Late spring after the maples finish, and late fall after final drop. In Ridgewood and its neighbors that means mid-November, because the oaks hold on well past the point when most cleaning services stop calling.
When Two Isn't Enough
Plan on three if: you're under the old-growth canopy on Ridgewood's established streets; you're in wooded Allendale near the Celery Farm or brook-side Ho-Ho-Kus; or three-plus mature hardwoods overhang your roofline.
Signs You Waited Too Long
Water sheeting over the edge in rain. Green growth in the gutter. Staining down stucco or clapboard, which shows fast on Tudor exteriors. Sagging runs, because saturated debris pulls hangers loose. Any of these means clean now; see our repair page if the sag started.
What Skipping Costs
A skipped $250 cleaning bills you later: rotted fascia at $150–$600 caught early, stained siding, and winter ice dams forming behind frozen debris. Pricing detail is in our Ridgewood cost guide.
Or Change the Math
If your lot honestly needs three visits, micromesh guards turn that into a light annual check. Our guards guide covers what survives oak-and-plane-tree country.