The first meaningful rain in the Tri-Valley usually shows up somewhere between mid-October and mid-November. Not the ten-minute sprinkle that spots your windshield, but the first storm that actually runs water down a roof for a few hours. If you want to prepare your gutters for the rainy season in California, that date is your deadline, and it’s worth working backward from it.
Here’s the honest scheduling note. Everyone in the valley remembers their gutters during the same week, usually the week the forecast first mentions rain. Our phones light up, and so does every other gutter company’s. If you call in mid-September you’ll get the appointment you want. If you call the Thursday before the first storm, you’ll get whatever’s left. That’s the whole pitch. No urgency beyond the calendar.
Why One Dry April Doesn’t Mean You’re Fine in December
San Ramon averages somewhere around 18 to 20 inches of rain a year depending on where in the valley you are, which sounds manageable spread across twelve months. It isn’t spread across twelve months. Nearly all of it falls between November and April, and within that window it arrives in a small number of large storms.
The research is striking on this point. Work from the Center for Western Weather and Water Extremes at Scripps found that in Northern California, roughly 60 to 120 hours of rainfall per year deliver more than half of the annual total. That’s a handful of days doing most of the work, and increasingly those days are atmospheric river events that dump an inch or more in a few hours.
This is why a system that handled last April’s light rain can still fail in December. A partially clogged gutter moves water fine at a trickle. Put an inch-an-hour storm through it and it overflows at the weakest point, usually over the front lip and down the siding, or backward against the fascia where you won’t see the damage until the paint starts bubbling. The failure isn’t gradual. It shows up the first time the system gets tested at full volume.
The pre-rain walk-through
None of this takes long, and most of it you can do from the ground.
1. Clear the debris, including the parts you can’t see. Valley oak leaves, acorns, sweetgum balls, and a summer’s worth of redwood and pine needles are sitting in there now. Acorns are the ones that matter most, since they don’t break down and they roll straight into downspout openings. A gutter cleaning before the rain starts is the single highest-value thing on this list.
2. Flush it and confirm the water comes out. Run a hose into the gutter at the far end from each downspout. Water should move steadily toward the outlet and come out the bottom at roughly the volume you put in. A weak trickle at the bottom means there’s a blockage in the downspout itself, which is common and easy to miss because the gutter above it looks clean.
3. Follow the water to where it actually lands. This is the step most people skip. Walk to each downspout outlet and look at the ground. Is there an extension, and is it still pointed away from the house? Extensions get kicked loose by lawn crews, moved for gardening, or knocked sideways over the summer. If water is discharging within a couple of feet of the foundation, you have a drainage problem regardless of how clean the gutters are.
4. Read the evidence from last winter. Your gutters already told you where they struggle. Look for dark vertical streaks on the siding or fascia below the gutter line, which mark where water went over the edge. Look for sections that visibly sag or hold a pool of standing water. Check the seams and corners for separation, and look at the fascia board itself for soft spots, discoloration, or peeling paint. Any of those are worth a repair now rather than in the middle of January.
5. Look up at the roofline. Debris in the valleys funnels straight into the gutters during the first storm, so a roof that looks clear from the driveway isn’t necessarily clear where it counts.
About the ladder
Straight talk on this one. If you have a single-story roofline, a stable ladder on level ground, and someone home with you, a pre-season gutter check is a reasonable Saturday project.
If you have a two-story roofline, it isn’t. That’s not us trying to talk you into a service call. It’s that a two-story gutter puts you 20 feet up on an extension ladder, leaning sideways to reach a section, on ground that may not be level, holding tools. Falls from ladders are the most common serious injury in home maintenance, and reaching out to the side while elevated is exactly the position that causes them. Multi-story homes, steep pitches, tile roofs, and anything over a hardscape or a slope are jobs for someone with the right equipment and the practice to use it.
There’s no shame in the split, either. Plenty of our customers do their own single-story back gutters and have us handle the two-story front.
What To Do With All This
If you want the full year rather than just the pre-season push, our season-by-season gutter care guide walks through what drops when in the San Ramon Valley and why we recommend cleaning twice a year here.
And if you’d rather have someone look at it before the rain does, we offer a free pre-season inspection. We’ll check flow, seams, hangers, pitch, and where your downspouts actually discharge, then tell you plainly what needs doing and what can wait. Sometimes the answer is nothing, and we’ll say that too.
Book your free pre-season inspection or call us at (925) 905-9555.