Once every 12 months, and Arizona measures the interval more precisely than any state we cover: violation date to violation date.
Here's why the measurement is the whole answer. Arizona's diversion dismisses the citation entirely, so the state rations it tightly and defines the ration exactly: the date of the violation you want diverted must be more than 12 months after the date of the last violation you diverted. Not the course dates, not the court dates, the violation dates. Two tickets 13 months apart both qualify no matter when you took each course; two tickets 11 months apart never can, even if the first course was 14 months ago. When a new ticket lands, the eligibility check is one subtraction between two dates printed on two citations.
That precision creates a genuinely awkward edge case worth knowing: a driver who diverted a ticket in, say, September 2025 and picks up another in July 2026 is simply outside the program for that new ticket. There's no partial credit and no discretion in the interval. The options revert to what any ineligible driver has, contesting or paying, which is why the once-a-year dismissal deserves to be treated like the valuable, rationed thing it is rather than an assumed safety net.
And each eligible use carries its own internal deadline: the course must be complete at least 7 days before that ticket's court date. The annual ration and the 7-day rule fail people in opposite directions, one from using the program too often, one from starting it too late.
What a successful use buys, the full dismissal with nothing reported to insurers, is on our points page, the fee structure is on our cost page, and every Supreme Court-certified online school we track is compared on the Arizona page.