Well, some phycadelic natural mushrooms are in different times of the year depending on climate and wheater and what not.... autum and early winter are good times to go hunting, like was said. Try in cow fields and what not.. Good luck with your hunting adventures...
Yeah fall and sometimes early spring there's some but it all depends what kinds of mushies you're looking for and what area they're in.
http://www.shroomery.com go there, it'll provide details which seasons that certain mushrooms do grow in. hope that helped.