Hi, skiddy. I'm also from central Iowa. This year, my experience has been that I either find patches of them, or nothing. All of my hot spots have been barren, so you aren't alone. Sadly, even though it's your land, there may be numerous people hunting on it without your permission. That goes on a lot. I was pretty much skunked until 3 days ago when I found 29 big yellows. Yesterday, I found 27 more. It's still on in central Iowa! Good luck.