Climate Zone 11: Northern Sacramento Valley
Very hot summers and cold winters — significant loads in both seasons.
Every Title 24 energy calculation uses the climate zone of the building’s physical location. In Zone 11, the climate is mixed, which shapes which building features have the most effect on compliance.
Typical project considerations
- Both heating and cooling matter.
- Envelope quality strongly affects results.
General guidance only — requirements depend on building type, scope and the code edition in effect for your permit application.
Example communities
Redding · Red Bluff · Chico
Official references
Frequently asked questions
Where is California Climate Zone 11?
Climate Zone 11 (Northern Sacramento Valley) covers areas such as Upper Sacramento Valley. Its representative weather city in CEC data is Red Bluff. Boundaries don’t follow city limits, so confirm by address.
Does Climate Zone 11 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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