10 to 20 clutches set annually, two this year in locations meeting your criteria. Both of those clutches failed. I have decades of experience and seen successful ground clutches, but pattern holds, on ground outside has much lower success rate through hatch, especially during periods of heavy rainfall. In past the number of clutches set annually much higher.How often does this happen?
There is a seasonal factor as well like with wild turkey and quail although hatching during those time frames is not desirable for economic reasons.