Duomid for Winter

I don’t think the tent makes much difference.  You get little warmth from it.  If it’s clear, any tent will prevent radiative heat loss which is significant.

One thing bad about mids is the walls are angled.  If it snows and it sticks to the walls, the walls can push in.  You lose a lot of effective floor area.  Especially if the snow slides down towards the bottom.

But, you can just kick it from the inside and it will clear.

Define winter…

Location?

Montana – planning November. Could be 15 below F plus windchill. Could be 60F. And this could be the same day.

What Jerry said above. You won’t get much warmth from tent. Its possible in a 4 season (single wall) tent you probably will not get the draft you could possibly get from a duo mid. Honestly though, I have no experience using a duo mid yet..  I would think you could use it though.. Pitch it low to ground if needed..

yeah it’ll work; if it’s really windy insure you have enough guys/stakes (could be snow stakes/skis/snowshoes/deadman/etc) to use every available tie out; if it snows hard you’ll have some snow loading to deal with- a few well placed smacks/kicks should get most of it

pro tip- a larger 1/8″ ccf pad weighs very little, but provides a nice barrier to the snow- basically a insulated ground sheet (MLD sells larger ones, others too)

there is no cold limit with the shelter if your sleep system is up to the task, extreme wind would be the limiting factor for a mid

I have used a MLD DuoMid for most of my Sierra Nevada winter snow camping where the nighttime lows never venture much below 10 or 15 degrees,  in other words, where it is warmer than Montana. But as stated above, the shelter itself protects against loss of heat from wind/convection but not from radiation. If you expect wind or snow flurries, you do need to build a very flat platform and seal the bottom tightly. When a snow storm has been forecast, I have taken a four season tent for the convenience factor.

If there is 4 to 6 feet of snow on the ground, you might be more comfortable in a snow cave or snow trench. Inside a properly built snow cave, the temperature never drops much below 32 degrees F.  You do risk getting wet during the construction so it is best getting trained. Your local Sierra Club or Mountaineering club chapter might offer a workshop on how to build them.