So it's bloody cold out in NJ AND.......
 

My car overheats. And has a boilover out of the reservoir tank.
Had to add more coolant once it cooled down and can pop the rad cap safely. I don't think anything got hurt and I wasn't driving hard at all. Just barely crawling it around. Happen to anyone else today? Any ideas Frozen coolant? Is that even possible?

Check both rad hoses for heat. If one is cold and one is hot, you've got rad/thermostat issues. Lacking that, make sure your cooling fans arent frozen in place - spin them by hand to check. Last but not least, look for coolant around the timing cover. See what ya end up with.

^x2

And what coolant/water ratio are you running? Hopefully 50/50.. I know it sounds like a stupid question but ive seen people forget to switch there summer coolant mix (ie 70% water/ 30% coolant or Water & Water Wetter) out before winter.. I know its pretty cold over there right now.

Duh still had summer coolant. It boiled out a lot so it now has about 2/3 of winter coolant. No more probs. yep it's cold and expecting a snowstorm. Drifting time. Lol