In most Arizona personal injury cases, you have two years from the date of injury to file a lawsuit.
This deadline comes from A.R.S. § 12-542. A few exceptions can change the clock: if the injured person is a minor, the two-year period generally doesn't start until they turn 18. If an injury wasn't immediately obvious, the clock may start when it was reasonably discoverable instead.
Claims against a government entity — a city, county, or state agency — run on a much shorter timeline: a formal notice of claim is typically due within 180 days, and any lawsuit within one year, under A.R.S. § 12-821.01 and § 12-821. Missing a deadline usually bars recovery permanently, so it's worth confirming your specific timeline early.