Its actually pretty easy to get it in the winter as well. I know guys who get it all the time from trappin, cuttin fire wood, andstuff. One guy last year I knew got it terribbly, he was covered arms chest, neck and face too Ithink.Also poison I've oils can stay on cloths for like a year if not washed. You could have got it from touching a pair of your boots or anything. I use to get it alot and badbut I htink my body became somewhat imune to it because I still get it once in awhile but only tiny spots and goes away real quick. Still that sucks and hopefully it don't get to bad for ya. Good luck. WCL