The best time to get a house ready for rain is before the first storm. After a long dry summer, panels, windows, gutters and roofs are all carrying months of dust and debris, and rain turns that into mud and streaks. This guide is a general before-the-rains checklist, plus a month-by-month plan for the 2026-2027 season.
Forecasters are talking about a strong El Niño this winter, so we wrote a separate El Niño 2026-27 guide too.
Why does fall prep matter here?
Southern California has a long dry stretch, then the rains arrive. Everything that settled on your house from spring through fall is still there when the first storm hits. Dust, pollen, leaves, bird droppings and any ash from regional fires have had months to bake onto surfaces.
When rain meets that layer, it doesn’t wash it clean. It wets it into a paste, then leaves streaks and spots as it dries. A little prep up front saves you a bigger cleanup later.
What’s on the checklist?
| Item | What to check or do | Service |
|---|---|---|
| Solar panels | Clean off summer dust and any ash before the first storm | Solar panel cleaning |
| Windows | Clean the glass, tracks and sills | Window cleaning |
| Screens | Look for tears, bent frames and loose spline | Screen repair |
| Gutters and downspouts | Clear debris so water drains | Gutter cleaning |
| Roof | Check shaded slopes for dark streaks | House washing and softwash |
| Panel edges and roof ridge | Look for birds and nests before nesting season | Bird proofing |
Should I clean solar panels before it rains?
Yes. Dust and ash that sit on glass through the dry months don’t rinse off in a light shower. They turn into a film. Rain also leaves mineral spots as it dries.
We clean panels by hand with soft brushes and purified water, with no high pressure on the glass. Customers tell us they see up to 32% more output after a cleaning, though results vary by system. Panels near open hillside or under trees get dirty faster. Our solar panel cleaning page has the details.
What about windows and screens?
Dirt on glass and in the tracks turns to mud when it gets wet, and it drips down the frames. Clean glass before the storms, and clear the tracks and weep holes so water can drain.
Check your screens too. A torn screen or bent frame is easier to deal with now. We handle screen repair as well as window cleaning, so we can look at both in one visit.
Are my gutters ready?
Gutters need to be clear before water shows up. Leaves, pollen, roof grit and fallen blossoms pile up over summer, and they block downspouts when it rains. We clean gutters ourselves, and you can read about it on our gutter cleaning page. For guards and repairs, our sister company Gutter Spa Club is the better call.
Look for gutters that sag, standing water, or plants growing in the trough. Any of those means it’s time.
Is there roof algae I should deal with?
Fall is a good time to look. Shaded and north-facing slopes grow dark algae streaks, and moisture is what feeds them. If you see streaks, a low pressure softwash cleans them without scraping or force. We explain it in our roof algae guide.
We clean roofs. We don’t repair them, so if you spot cracked tile, lifted shingles or leaks, call a roofer.
Should I bird proof now?
Nesting season picks up in spring, so fall and winter are a good window to close gaps under panels. If birds are already using the space, clean out the debris first, then install mesh, spikes or netting. Our bird proofing guide goes through the methods.
What can I do myself?
Plenty of this is a walk around the house with a notepad. None of it needs a ladder.
- Look at the roof from the ground with binoculars for dark streaks and bird activity.
- Check the gutters from a safe spot for sagging or plants growing in them.
- Run a hand along window screens and look for tears.
- Look at the panels from the ground. A gray film or white streaks means dust and mineral spots.
- Check that sprinklers aren’t spraying the walls or the roof edge.
Keep your feet on the ground. Roofs are slippery, and tile breaks underfoot. Leave the roof work to people who do it daily and carry insurance. We’re Licensed & Insured.
What’s the plan, month by month?
This is a general guide. Your timing may shift depending on your trees and your roof.
| Month | What to do |
|---|---|
| September | Book fall visits early. Walk the property and note streaks, tears and bird activity. |
| October | Clean solar panels and windows. Clear gutters. Check roof slopes for algae. |
| November | Finish anything left over. Install bird proofing while the weather is mild. Check screens and tracks. |
| December | After the first storms, look at gutters, downspouts and glass for new mess. |
| January | Check for leaf buildup after wind and any streaks that appeared. |
| February | Look at the roof and walls for growth that took hold in the damp. |
| March | Plan spring cleaning of panels and windows. Check for early nesting. |
What if the rain has already started?
It’s not too late. Panels and windows can be cleaned between storms, and the glass looks better for it. Gutters are worth clearing as soon as you have a dry day, since packed debris holds water against the roof edge. Roof and wall washing is usually easier to schedule once things have dried out, so we’ll talk through timing when you call.
Why book early?
Once a storm shows up in the forecast, phones start ringing. Booking in September or October gets you a date before the rush. Our membership can also keep you on a regular schedule.
Homes in Porter Ranch, Calabasas and Tujunga, close to open hillside, tend to collect the most dust and debris. Homes in Valencia, Chatsworth, Thousand Oaks and Simi Valley each have their own mix of trees, tile roofs and wind. If you’re not sure what you need, we’ll take a look.
Get your free estimate
Estimates are free. Call (818) 913-1626 Monday through Saturday, 7am to 7pm, or check the cities we serve page and send us a request for your area.