Climate Zone 16: Mountains
Cold, snowy winters and mild summers at elevation.
Every Title 24 energy calculation uses the climate zone of the building’s physical location. In Zone 16, the climate is heating-dominated, which shapes which building features have the most effect on compliance.
Typical project considerations
- Heating dominates; insulation levels and air sealing are critical.
- Heat-pump selection should account for cold-climate performance.
General guidance only — requirements depend on building type, scope and the code edition in effect for your permit application.
Example communities
South Lake Tahoe · Mammoth Lakes · Big Bear Lake
City guides: Los Angeles
Official references
Frequently asked questions
Where is California Climate Zone 16?
Climate Zone 16 (Mountains) covers areas such as Sierra Nevada, mountain areas statewide. Its representative weather city in CEC data is Blue Canyon. Boundaries don’t follow city limits, so confirm by address.
Does Climate Zone 16 change my Title 24 requirements?
Yes. All Energy Code calculations use the project’s climate zone, which affects prescriptive values such as insulation and window performance and how heating and cooling are weighted in performance modeling.
What report do I need?
Single-family projects use CF1R, low-rise multifamily uses LMCC and nonresidential projects use NRCC forms — regardless of climate zone.
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