Ticks are out all year long, no matter what the temperature or the amount of snow. Every time I've gone out hunting this year from October til now, I've had multiple ticks on me. This is northern PA winters and we have lots of snow and it's chilly..if you look closely at trees and plants you'll find ticks and spiders.
I have minor fits every time I find a tick...one afternoon, between my dad and I, we had at least 50 ticks on us. It's a good thing we were squirrel hunting because my freaking out and whining would have scared off all deer within miles.