North East Wyoming can be lush in May, that's usually the month that those of us involved in agriculture and who live in Crook County consider the wettest. We might even get some good moisture in June, but usually by July the rain shuts down and we proceed with what rain the months of April, May and June brought us.
I'll admit that my Crook County experience is limited, but in the 15 years we've been here and involved in ranching, at least half or more of those years have been years of poor hay crops.
Sodbuster, we hope you'll join us in Wyoming ! My comment and comments from others who live in Wyoming should still stand and our advice to think of Wyoming as a DRY country should be considered.
I have also been in agriculture in Minnesota and I know from personal experience that there's a great difference in the way a farmer needs to look at things between there and here.