The Best Time to Install Solar Panels in California

California is one of the best places in the country for solar power. With abundant sunshine, high utility rates and a growing focus on clean energy, more homeowners are turning to rooftop solar to reduce electricity costs and increase energy independence. But when is the best time to install solar panels in California?

The answer isn’t just about weather, it’s about maximizing value. In this guide, we’ll explain the ideal seasons for solar panel installation, how to make the most of incentives and what factors homeowners should consider before going solar.

Why Timing Matters for Solar Panel Installation

Solar energy works year-round in California, but timing your installation can impact savings, project timelines, and overall return on investment. Here’s why it matters:

• Federal and state tax credit deadlines
• Permitting and inspection timelines
• Solar contractor availability
• Utility rate changes and seasonal Time-of-Use pricing
• Weather conditions that affect labor and equipment

Making the right move at the right time means faster activation, lower costs and optimized performance.

Spring and Fall: The Ideal Seasons for Going Solar

Although California’s climate allows for solar projects throughout the year, spring and fall offer a near-perfect balance of favorable weather and optimal efficiency.

Spring Advantages

• Lower temperatures improve solar panel efficiency
• Beat the summer rush and high utility bills
• 30% federal solar tax credit applies before installation deadlines
• Ideal permitting and inspection window
• More availability from licensed contractors

Spring installations ensure your system is up and running before the hottest and most expensive months of the year.

Fall Benefits

• Great for completing the project before year-end tax deadlines
• Avoid long wait times during winter holidays
• Weather is stable and less likely to delay installation
• Equipment supply is often more predictable in the fall

If you want to lock in savings before the new year, fall is a strategic time to act.

Can You Install Solar Panels in Summer or Winter?

Yes. While not ideal in every situation, summer and winter installations are still common and can be beneficial in the right context.

Summer Considerations

• High electricity bills highlight the value of solar
• Utility rates are often at their peak under Time-of-Use plans
• Many homeowners seek last-minute installations, which can lead to longer wait times
• Roof temperatures can be high, reducing panel output slightly but not significantly

Winter Considerations

• Shorter days and occasional rain in Northern California may cause minor delays
• Installers have more availability, which can speed up timelines
• Ideal for homeowners who want solar activated for a new year of savings
• Less demand means you may qualify for seasonal promotions or discounts

The Role of Incentives and Net Metering

One of the most important reasons to install solar now is to lock in the 30% Federal Solar Investment Tax Credit (ITC). It covers nearly a third of your total project cost, including equipment and labor. This credit is set to begin phasing down after 2032, which makes early adoption a smart move.

California also uses Net Energy Metering (NEM) to credit homeowners for excess solar energy sent to the grid. Under NEM 3.0, credit rates have changed, making it more important to consume solar power in real time or store it in a battery. The sooner you adapt, the better your long-term savings.

Regional Factors That Affect Installation Timing

Each part of California has its own climate and energy profile. Timing your solar project to your location can further optimize performance and reduce delays.

Southern California

• Year-round sunshine and minimal rain make installation possible any month
• Strong solar incentives and high electric rates make early installation ideal
• No significant weather delays in most areas

Northern California

• Winter months bring more rain, which may cause short delays
• High PG&E rates make solar highly valuable year-round
• Spring and fall are particularly favorable for rooftop solar projects

Inland and Desert Regions

• Summer temperatures can slightly reduce panel efficiency
• Winter and early spring installations are often preferred
• Solar battery storage helps optimize performance in remote areas

Why Waiting May Cost You

Every month you wait to install solar panels is a month of paying full price for electricity. With rising utility rates and changes to incentive programs, hesitation could cost you thousands in long-term savings.

Let’s break down a simple example:

Over 25 years, those savings could exceed $18,000, depending on your energy usage and system size.

Semper Solaris: A Partner You Can Trust

Choosing the right installer is just as important as picking the right time. Semper Solaris is proud to be a veteran-owned and operated solar company with deep roots in California communities. Our crews handle everything in-house. From permitting to installation to follow-up support.

Why homeowners choose Semper Solaris:

• American-made solar panel systems
• Top-rated service and local expertise
• Competitive financing and zero down options
• Roofing, battery storage and HVAC upgrades available
• Military discounts through our Semper Fi Savings program

 Learn more about our services: Solar Panel Installation Services

Ready to Switch to Renewable Energy?

The best time to go solar is when it makes the most sense for your budget, your roof and your energy needs. But in California, that often means acting sooner rather than later.

With strong sunshine, available tax credits and rising electricity prices, installing solar now sets you up for long-term energy savings and sustainability.

Get a free solar quote today and find out how much you could save.