How often you should clean solar panels depends mostly on where you live. Desert states such as Arizona, Nevada and Utah need cleaning every 3–6 months; pollen-heavy Southeastern states benefit most from one clean right after spring; rainy Northeastern states usually need just one clean a year. High electricity prices — in California, Hawaii, Massachusetts and New York — make each clean worth more.
We combined NREL soiling research, typical regional solar production, U.S. Energy Information Administration electricity prices and local climate factors to build a cleaning schedule for each state. Choose your state for local soiling causes, the best months to clean, a payback estimate and state-specific tips.
Arizona
Every 3–4 months · Very high soiling risk
CACalifornia
Every 4–6 months (inland), 6–12 months (coastal) · High soiling risk
TXTexas
Every 4–6 months · High soiling risk
FLFlorida
Every 6–12 months · Moderate soiling risk
NVNevada
Every 3–4 months · Very high soiling risk
NCNorth Carolina
Every 6–12 months, ideally right after pollen season · Moderate soiling risk
NJNew Jersey
Once a year (twice if near highways or trees) · Low–Moderate soiling risk
MAMassachusetts
Once a year · Low soiling risk
NYNew York
Once a year (twice in NYC or near highways) · Low–Moderate soiling risk
COColorado
Every 6 months · Moderate soiling risk
UTUtah
Every 4–6 months · High soiling risk
GAGeorgia
Every 6–12 months, right after pollen season · Moderate soiling risk
HIHawaii
Every 4–6 months (leeward/coastal) · Moderate soiling risk
State-by-state solar panel cleaning comparison
| State | Soiling risk | How often to clean | Power price | Energy lost to dirt / yr* |
|---|---|---|---|---|
| Arizona | Very high | Every 3–4 months | 15.2¢ | $124 |
| California | High | Every 4–6 months (inland), 6–12 months (coastal) | 33.3¢ | $213 |
| Texas | High (West), Moderate (East) | Every 4–6 months; every 3 months in West Texas | 16.4¢ | $79 |
| Florida | Moderate | Every 6–12 months; every 4–6 months near the coast or under trees | 15.2¢ | $53 |
| Nevada | Very high | Every 3–4 months | 13.6¢ | $114 |
| North Carolina | Moderate (High in pollen season) | Every 6–12 months, ideally right after pollen season | 15.1¢ | $65 |
| New Jersey | Low–Moderate | Once a year (twice if near highways or trees) | 23.3¢ | $58 |
| Massachusetts | Low | Once a year | 28.8¢ | $55 |
| New York | Low–Moderate | Once a year (twice in NYC or near highways) | 29.9¢ | $57 |
| Colorado | Moderate | Every 6 months | 16.2¢ | $70 |
| Utah | High | Every 4–6 months | 13.0¢ | $64 |
| Georgia | Moderate (High in pollen season) | Every 6–12 months, right after pollen season | 15.8¢ | $71 |
| Hawaii | Moderate | Every 4–6 months (leeward/coastal); 6–12 months (windward) | 52.0¢ | $187 |
What decides how often you should clean?
- Rainfall and dry seasons — long dry spells (Southwest, California summers) let dust build up with no natural rinse.
- Dust, farming and construction — unpaved roads, fields and building sites dramatically raise soiling rates.
- Pollen — sticky pine and oak pollen in the Southeast can cut output by up to 15% at peak season, and rain alone doesn’t remove it.
- Coastal salt and urban soot — both leave films that rain rinses poorly.
- Electricity price — the higher your rate, the more each lost kWh costs and the sooner a clean pays for itself.
- Panel tilt — flat or low-tilt panels hold dirt and water; steeper panels self-clean better.
Ready to clean? Follow our step-by-step cleaning guide, check typical solar panel cleaning costs, and keep everything else in shape with the solar panel maintenance checklist.
Data sources
- U.S. Energy Information Administration, average residential electricity price by state (May 2026), via ElectricRates.org.
- NREL soiling research — typical U.S. soiling losses ≈2–7%/yr; North Carolina pollen study (up to 15% at peak).
- Approximate statewide precipitation normals (NOAA climate data).