Peak Winter - Sleeping Bag

Hi @vlebe - I used a -7c Asolo Torino for my January/February Camino a few years back. It's a down bag weighing in around 3lb 4oz. I can say that many nights I would have been fine with a 0c bag however there were a few nights where I was bordering on cold in my -7c bag! There will be few Albergues open and those that are often don't have any heat turned on that time of the year. If I went in winter again I would now consider carrying a 0c bag (lighter in weight than mine) along with a Sea to Summit Reactor Extreme mummy bag liner. The overall weight should be less and on the nights when it isn't too cold I'd be more comfortable. For my recent spring Camino I used a Thermorest Down Sleeping Quilt that is good to 0c so that may be an option to explore as it was nice and little and extraordinarily comfortable!
Good luck and Buen Camino
Jordon

I would second what @jozero has said. Last year I walked the Camino Ingles in early January. On one night I slept in an unheated albergue where the temperature was close to freezing. I was using a warm but lightweight bag rated for comfort to 0C and extremes closer to -10C. I still found myself wearing both long thermal underwear and an additional layer top and bottom. Other albergues were heated but not necessarily to the temperature one might expect at home. I would err on the side of caution if planning a winter trip.

In cold weather never choose a bunk placed against an exterior wall since old walls are often uninsulated and thus frigid. All night heating is not the norm hence make a cozy 'sandwich' for sleeping by folding a blanket in half the long way, place your sleeping bag on top of the bottom half and pull the top half over all. If there are no blankets put your poncho beneath the bag to block the cold air from rising.

Runner's winter tights, a long sleeve runner's shirt and loose socks as well as a warm hat are great to wear to bunk/bed wben it is really cold. Over the past years the coldest I have ever slept on the camino was late February 2006 in the then unheated Hornillos del Camino municipal albergue. Breath hung white in the frigid interior air and ice formed in the toilet bowl. Nevertheless dressed as above I was snug in my sleeping bag and liner.

For additional posts re cold weather sleeping see this recent Forum thread. https://www.caminodesantiago.me/community/threads/sleeping-system-for-cold-weather.40968/