Best Time of Year to Clean Solar Panels in San Diego
Spring after pollen and fall before winter rains are the two highest-impact slots for San Diego solar cleaning.
There's no wrong time to clean solar panels in San Diego, but two windows give you the biggest production return on the cleaning dollar — late spring and early fall.
Spring cleaning after pollen season
San Diego pollen season runs February through early May. Cleaning in mid-to-late May removes the entire pollen film at once, ahead of the long high-production summer. Skip this and you give up roughly 8–12% of your peak summer output.
Fall cleaning before winter dust storms
Santa Ana winds in October and November deposit a fine layer of inland dust that the first rain bakes into the glass. An early-October cleaning sets you up cleanest for the highest-value winter production days and prevents the rain-baked mineral layer from forming.
Why year-round cadence beats seasonal
A biannual plan locks in both windows automatically and gives you a free thermal inspection between them. For coastal homes or homes near construction, a quarterly plan is more economical because soiling rates double — the cleaning recovers production faster than you lose it.