by AlmostThere » Sun Jan 22, 2012 8:07 am
I dont' think you will have a problem with the tent. The issue with winter camping is not camping on snow, but having snow fall on you and wind hitting the tent - as long as you are careful to mind the weather forecast and have a car nearby to escape to should things turn stormy and the tent becomes too... whatever, you likely won't have any issues. It's when you are backpacking long distances in winter in deep snow in the depths of winter that a true four season tent built to withstand winter storms becomes necessary. Most 4 season tents are going to be overkill for a couple of nights of car camping.
Zero degrees celsius is not a very warm bag, however. I would take a 0F bag instead, or extra blankets and clothes to use with the bag you have. And an insulated air pad is likely going to be a three season rated if you've been using it in the conditions you describe, but adding a cheap blue CCF pad from Target or Walmart underneath it will ensure you are insulated against the cold ground.
There are no platforms in most of the campsites in the valley. I seem to recall a couple but they are no doubt as snow covered or frozen as any of the regular sites.
Tent heaters - no. Unless it's battery operated... most I've seen are propane, and it is not safe to operate such devices in a tent due to fumes. And with any heat source you must be aware that it will melt the nylon in a heartbeat if it comes in contact with the floor, walls, etc. of the tent, or with the shell of a sleeping bag, a jacket... You're better off eating and drinking well, walking around some before turning in for the night, and having enough insulation for the night.