I have. My college buddies and I would do it every year during the closest weekend to valentines day. It was planned as a protest to the hallmark holiday. This way, we had an annual planned trip - and will say it eliminated some of the "soft" women from long term relationships. My girlfriend, now wife, joined two different times. Would like to do this with our children now, but really doubt the wife would go again.
If you go, a few tips:
- Good gear is gold. Get a -30 deg bag. You will need one that has a hood with a good drawstring. If it becomes very cold, the drawstring will freeze from your moisture during breathing. In the morning, you will need to work the frozen string apart to open your bag. If you are closter phobic, this can be a pretty negative experience. Just something to be aware of.
- Your best bet to stay warm is getting off the ground. Even a good bag compresses when you sleep, and the air trapped between you and outside of the bag is what keeps you warm. An air-mat is minimum (and what I used), but cots would be better.
- A four season tent is a must if there is risk of snow. I used a 3 season and we received 2-3" of snow and was at risk of collapse and does not "breath" the way it should during a snow event. So imagine if you are stuck in your sleeping bag, takes you 2-5 minutes to work the frozen draw string open and you are in a collapsed tent.
- Make sure you open your boots when you call it a night. No matter how good of boot you have, it will have moisture in it. When the boot cools off, it will freeze in what ever position you left it last. If it is not open, in the morning you will not be able to get your foot in.
- Avoid alcohol. It will keep your body cooler.
- I would take a propane lantern to take the chill out of the tent as I was getting ready to hit the hay, and right in the morning.
The coldest night we had was -14F. It was so cold the ranger was worried about us and checked in a few times. We were a bit chilled, but all fine. During our years of doing this, it was a lot of fun. We snowshoed, played bocchi ball, horse shoes, cooked on an open fire and had a great time. If you are well prepared, certainly is not bad.