Cold-weather camping
The whole clock on this site is built on liquid, reachable water. Cold breaks that. Below freezing your fresh tank can read full while you can't get a drop out of it, your grey tank quits, your filter cracks, and the road you drove in on locks up overnight. Cold camping is worth it — quiet spots, no bugs, snow you'll remember — but it's the season that punishes a lazy plan hardest, and the one hazard here you can't smell — carbon monoxide — is the one that can kill you in your sleep. Here's the honest version of doing it warm and getting home.
Cold changes the whole clock
Every estimate on this site assumes water you can pour. In a freeze that stops being true. The autonomy card is tank math — gallons divided by how much you use — and it bends for cold in one narrow way: if you tell it you expect cold nights, or you're up high (around 8,000 feet) where it assumes them for you — either way, with a furnace, it just burns your propane faster. That's the whole of it. It never freezes a tank. A hard freeze can take your usable water to zero while the fresh tank still reads full — frozen lines, a frozen pump, a frozen filter, and iced-up outside hoses cut you off from water that's right there — and a grey or black tank frozen solid can't be dumped, so it fills and ends the stay just the same. The short version: cold can burn your propane faster on the card; a freeze can kill your usable water off it. Read the day count as a good-conditions estimate and plan the cold in yourself.
Your sleep system does the heat lifting, not a bigger heater
Warmth at night comes mostly from what's around you and under you, not from a cranked heater. The ground steals more heat than the cold air does, so an insulated pad matters as much as the bag — an R-value is a rough guide (higher means more insulation from the cold ground), and stacking a second pad under you in deep cold does more than most people expect. Carry a bag rated below the low you expect with margin, but know that comfort ratings assume a decent pad and dry gear and the marketing number tends to run optimistic — don't bet the night on it. Dress in layers you can add and shed, and keep wet cotton off your skin in the cold: soaked cotton stops insulating and pulls heat out of you, which is dangerous, not just uncomfortable — wool or synthetic next to the skin, and change out of anything you sweated through before you sleep. A warm hat, dry socks, and a snack before bed do more than turning up the heat. A heat source is a backup — it is not a fix for a bad pad, a thin bag, or wet clothes.
Ventilation and the one you can't smell
A warm rig full of breath and cooking makes water, and that water condenses on cold walls and windows and drips onto your bag. Crack a vent even when it's cold — a little airflow beats a soaked quilt. But the real reason to respect the air in a closed rig is carbon monoxide, and this is the part that doesn't bend: never sleep with an unvented flame for heat — a portable propane "buddy"-style or catalytic heater, an open flame, a stove left burning. Never sleep with a generator running for heat, or with its exhaust anywhere near a window or vent. Never idle the vehicle to stay warm while you sleep. Carbon monoxide has no smell and no color — a cracked window does not make an unvented heater safe, and a propane smell is not your CO warning. Run a working CO detector and test it. A factory RV furnace is a different animal — it's built to vent its exhaust outside — but even then, keep the CO detector working, keep a little ventilation for the moisture, and keep that outside exhaust clear of drifting snow: a buried furnace exhaust pushes the fumes back inside, and that has killed people.
Keep your water liquid
Water is the clock, and in a freeze it's the first thing to quit. Keep your drinking bottles from freezing — tuck them inside the rig, insulate them, and sleep with the ones you'll want in the morning. Insulate or heat your tanks if the rig can do it, and drain and disconnect any hose or line that lives outside when you're done, because that's what freezes first. A water filter that freezes while it's wet can crack inside where you'll never see it — a hard freeze leaves it damaged or unreliable even if it looks fine, so treat a filter you couldn't keep from freezing as trash and don't gamble your gut on it. Melting snow for water works, but it burns a lot of fuel for a little water, and melted snow still isn't clean — treat it like any other source you collect.
Getting in — and back out
The road is what catches people in the cold. Snow, ice, and freeze-thaw mud turn an easy two-track into a trap, and a track that was fine driving in can lock up overnight or turn to soup at midday. Check the forecast and the road or area status before you commit — not just the weather, but whether the route is even open — carry traction (chains or boards) and know how to use them, and hold to the iron rule: don't drive in past the point where you can get yourself back out. Short winter days give you less daylight to dig out or turn around, so leave margin and set up early. And tell someone your spot and when you'll be back out — cold plus stuck plus no signal is how a good trip turns into a rescue. The forest travel map tells you which roads exist; it does not tell you which ones are drivable under snow.
Battery, propane, fuel — and your own body
Cold works on your rig, too. A battery holds less and drains faster in the cold, and a solar panel gives you less in short, low winter sun. Propane keeps flowing but its pressure can drop when it gets really cold, so a heater or stove can run weak on the worst nights — the card counts the propane you burn in pounds, but it can't tell that your tank is struggling to vaporize. And fuel goes faster idling and grinding through snow. Your battery and your fuel are never on the card — it counts water, grey, black, food, and propane, in any season — so in the cold those two are yours to watch. But the gauge that matters most is you: learn the early signs of hypothermia (shivering, clumsy hands, slow or foggy thinking) and frostbite (numb, waxy, hard, white skin on fingers, toes, nose, or ears), and treat either as a reason to get warm now, not to tough out. Eat, drink, and stay dry — a fed, dry, rested body makes its own heat, and that's the best cold-weather gear there is.
One honest split to end on: the tools on this site don't feel the cold the way you do. The autonomy card is tank math — it'll burn propane faster up high, but it never freezes a tank and never counts your battery or fuel. The weather strip on a camp page is a real forecast, but it's a broad area forecast — not the temperature at your exact pin, not corrected for your elevation, and it says nothing about the road. The map shows services in a straight line, not whether you can reach them over snow. So check the forecast, check the road status, know your own limits — and when the cold says turn around, turn around.