Ticks, ladybugs, grasshoppers and a handfull of other insects (actually a tick is an arachnid) can produce a glycol (antifreeze) substance in their body-fluid so they won't freeze.
So the ones that emerged from under the leaf-litter about a week ago and are probably covered with snow here in Polk County, are just waiting out the next warm-up.
Insects, ticks, and all "BUGS" are very adapatable little creatures. Some of the ways they survive is amazing. I do think roaches would be the only thing to survive a nuclear war...or however that saying goes.
I don't like ticks, but they don't freak me out either. However I'd be lying if I said that after I find one, that I didn't get the hee-bee-gee-bees. After you find one it seems like you can feel them crawling allover. SWEET, I can't wait.