People often ask which cities are in Climate Zone 3. The accurate answer: California climate zones are assigned by exact project address — usually by ZIP code — and a single city can span more than one zone.
Why we don't publish a fixed city list
Because zone boundaries follow geography and elevation rather than city limits, listing a city as definitively "in Zone 3" can be inaccurate. Title 24 is a statewide California energy code. Climate Zone 3 does not have its own separate rules — the same statewide standards apply, with the energy budget calibrated to this zone's climate. Your project's exact requirements are determined when your specific address is modeled in CEC-approved compliance software. We determine your exact zone from your project address before modeling — so you never have to look it up yourself.
Find your zone
Browse our city Title 24 pages for local information, or just send your project address and we'll confirm the climate zone and prepare your report. See also: California climate zones overview.