Darn, that's pretty bad. The growth point isn't green anymore either. I think it's pretty much dead. As Leathal_Traps said you can only hope the roots/base survived. If there's no signs of life in 1-2 months it's pretty much done. I think it's dead.
You might want to keep a weather forecast with you at all times. I check daily and even every few hours if there's any chance temps might drop dramatically until at least mid-April. Most frost warnings are given at least a few hours in advance and it would have saved it.
EDIT: I just noticed you're from Ontario. I'm sorry to say but you should really be aware of the temperatures there almost on a daily basis. Even now it shows 2-6C (36 Fahrenheit) which is too low. I lived in Canada for 4 years(Winnipeg) and when daily temps are in the 40s there's no reason to have a nepenthes outside. Maybe when the daily highs are over 60 and even then they prefer summer temperatures.