The Smog
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Every California smog check term and question, plainly defined
A–Z
› How early can I do my smog before registration is due?
How early can I do my smog before registration is due?
Up to 90 days before registration expires.
smog cert is good for 90 days
DMV accepts cert within this window
no benefit to going earlier
Per BAR cert validity rules.
View in the A–Z glossary →