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Winter Sleeping Bags

How to Choose a Sleeping Bag for Pacific Northwest Winter Backpacking

If you are use to camping in summer and the shoulder seasons and are wondering what type of sleeping bag you’ll need for winter use in the Cascade Mountains here in Washington State, here are some basic points to consider.

Picking the Temperature Rating

The first thing you need to do is to determine the temperature rating you need. Winters in the Pacific Northwest are mild compared to other regions this far north. One way to determine likely temperatures is to study the average temperatures at different elevations on major peaks throughout the Cascade range. For me, the best potential campsites will start around 3000 ft, but in most instances, I end up camping around 4500–7500ft. I’ve only camped twice at higher elevations (Camp Muir at 10,000ft and Mount Adams at 12,ooo ft). Here in Washington State, if you look at temperatures on peaks North and South, West and East, you find that temperatures tend to be colder on the Eastside, as well as further North.

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Food storage Sleeping systems Snow camping Tent setup Winter camping

Tips for a Better Winter Campsite

1. Camp on snow

Be equipped to camp on the snow. Once you learn how to do it and how comfortable it is, you may never want to camp on the ground again. To do this, you need a sleeping system with sufficient R-value (5+) under your sleeping bag. The standard practice for snow camping in the Pacific Northwest is two mattresses, either one solid core and one air or two solid ones.

Snow is soft and clean, usually free of sticks and rocks. It makes the most comfortable surface and often requires no preparation. Sometimes you might need to stomp it down a bit with snowshoes or level it with a snow shovel. It is easy to level a spot even on slopes. Pitching a tent on the snow is the lowest impact (leave no trace) way to camp. It also increases your campsite options (unless you are in an area where designated campsites are the only permissible locations). And, it is often the only option if you want to camp in the winter season. So be prepared!

For more on sleeping warm, see winter sleeping bags.

Winter sleeping system
My main sleeping system consists of a roll-out solid core foam mattress, an air mattress, and a sleeping bag. The solid core foam mattress has an R-value of 2.8 (about $30) and two of these will do the job. Or one 2.8 foam pad coupled with an air mattress with at least 2.5 R-value and you’ll be comfortable. I use a Therm-a-Rest NeoAir XTherm Sleeping Pad which has 5.7 R-value ($150–225). The patches on my sleeping bag are the result of some small critter eating through the bag to gather down stuffing.