Here's an article that may help a little: http://voices.yahoo.com/what-seed-ticks-6029558.html

It seems that seed ticks don't travel far from where they hatch. That's why you'll run into hundreds, or even thousands of them, all in one place. But one thing it mentions is that seed ticks are more prevalent in that area (Missouri) during late summer. I'll bet the same applies in Kentucky or Indiana. Also, this dry summer has been good for some spiders and other arachnids; I would guess it's probably good for ticks, too.