Pierce County tried it. They quickly undid it.

IRV confused the voters. The election administrators were dead set against it, so were only too happy to allow it to fail.

Aside, on the election integrity front, IRV is difficult to tabulate and necessitates digital tabulation. I initially supported IRV, so many years ago, but its inherit complexity finally turned me off.

I now support Approval Voting. More fair than IRV, trivial to tabulate, easy to explain.