As much as I love this site, I have had quite a bit of experience with mushrooms, and I would say SHROOMERY.ORG is your best bet at answering all of your questions and helping you identify all sorts of mushrooms. It's the RollItUp of mushrooms, and that forum has some really good stuff.
As for what I can guess about your area, is that yes. While it's much colder up there, mycillium can go dormant for a good while and with summer weather & some moisture you should be able to find mushrooms for a short period of time. About now would be the time. The cow pasture provides the grow medium & nutrients necessary for mushroom development. Some spores are even contained within the food that cows are fed (grains, meals, ...). These spores are not psychoactive. The cows can eat this spores, digest them, shit them out along with some quality nutrients and whatnot, and this will all work in tandem to produce a good system of mycillium for mushroom development.
Good luck on your ventures! It's fun. I remember those good ole days!
One Love