San Bernardino County, California
Gutter cleaning, repair and new gutters in Ontario, CA
Rain in Ontario adds up to about 12 inches in a normal year, with about 3 days that bring an inch or more. The wettest season is winter (December to February), with about 7.5 inches; the driest is summer (June to August), with 0.1. Off a 1,000-square-foot roof, that comes to about 7,200 gallons a year for the gutters to carry.
Call (866) 228-6229 free call to a gutter contractor serving OntarioOntario: rain and roofs
NOAA station USW00003102, 1 miBars to one scale; the longest is winter (December to February).
By heavy-rain days, Ontario falls near the middle of the 939 places in California on this site (2.7 a year). By house age it falls near the middle of the 938 places in California on this site (half built by 1980).
When to clean gutters in Ontario
Frost is rare in Ontario, and in many years there is none (NOAA normals). With no hard freeze to strip the trees, the fall cleaning follows the leaf drop itself; book it once the trees over the roof are bare, and plan a second visit in spring.
When to clean gutters explains how the trees over a roof change the schedule.
Gutter and downspout size for Ontario rain
The short, hard downpour is what a gutter is sized for. In Ontario the five-minute rain expected about once in ten years falls at 2.82 inches an hour (NOAA Atlas 14 Volume 6). At that rate one 2-by-3-inch downspout drains about 2,550 square feet of roof and one 3-by-4-inch downspout about 5,110, by the rule in the Copper Development Association’s design handbook. Try your own roof in the gutter and downspout calculator, which starts from this figure.
Ontario is dry by national standards, about 12 inches in a normal year, but much of the rain that does come can arrive in short, hard storms: the five-minute downpour expected once in ten years still runs at 2.82 inches an hour. Where gutters are used here, the job is moving that burst away from the foundation, and keeping a dry season’s dust and debris from blocking the first storm.
The houses in Ontario
Half the homes in Ontario were built by 1980, 51% before 1980 (ACS 2020–2024). Houses that age have often had their gutters replaced once already; if not, the original runs and the boards behind them deserve a close look. On a house built before 1978, replacing more than 20 square feet of painted fascia or trim falls under the EPA’s lead-safe rule, so ask whether the crew is certified.
57% of households own their home, and 58% of homes are detached houses, 9% townhouses. If an association maintains the exterior, the gutters may be its job rather than yours; check before calling.
Hiring in California
Licensing for gutter work differs from state to state; ask a contractor in Ontario which license or registration they hold in California, and for proof of liability insurance. Hiring a gutter contractor
In California’s fire hazard severity zones, the 2025 Wildland-Urban Interface Code (in force January 1, 2026) requires gutters and downspouts of noncombustible material, and gutters fitted with an approved means to keep leaves and debris from collecting (section 504.4). (2025 California Wildland-Urban Interface Code, Chapter 5 (UpCodes))
Gutter work in Ontario
With half the homes built by 1980, replacement gutters and the fascia behind them come up more often here than in newer suburbs. The line takes all of it: