Winter dry camping: stay warm, powered, and safe

Cold works against you twice

In summer, your limiting factor is usually water or battery capacity on a stable baseline. In winter, the baseline itself moves. The same rig that ran four comfortable days in October may struggle through two nights in January, because heat is now your largest energy consumer and your storage systems are less effective in the cold.

Heat: what the furnace really costs

A typical RV propane furnace has an input rating of roughly 20,000 to 40,000 BTU per hour, printed on its data plate. It does not run continuously, but on a cold night the duty cycle climbs, and the total burn adds up quickly. Work through the arithmetic in how long will your propane last before a winter trip, then round up.

The furnace also uses electricity. The blower fan draws a meaningful 12-volt load the entire time the furnace runs, so a long cold night hits both your propane supply and your battery bank. If your furnace will run several hours overnight, include that in the battery calculator as its own line item.

Catalytic and other unvented propane heaters are more fuel-efficient than a ducted furnace, but they add moisture to the air and consume oxygen from the living space. If you use one, follow the manufacturer's ventilation requirements exactly, and never rely on the stove or oven for heat.

Batteries in the cold

Lead-acid batteries deliver noticeably less usable capacity as temperatures fall, so the runtime you measured in mild weather is optimistic for winter. Lithium batteries hold up better in discharge, but many cannot safely accept a charge below about freezing unless they have built-in heating; charging a cold lithium battery outside its rated range can damage it. Check your battery's specifications rather than assuming.

Practical adjustments: keep batteries in a heated or insulated compartment where possible, do your generator or solar charging during the warmest hours, and treat your calculated runtime as a ceiling rather than a promise.

Keep your water liquid

Dry camping actually simplifies winter water compared with hookups, because there is no exposed hose to freeze — everything rides inside. The risks that remain are the underbelly plumbing, the pump, exterior dump valves, and any tank mounted outside the heated envelope.

• Fill your fresh tank before arriving and plan around it, rather than counting on finding an unfrozen spigot.
• If your rig has tank heating pads or an enclosed, furnace-ducted underbelly, confirm they work before the trip.
• Keep interior cabinet doors open overnight so warm air reaches plumbing against exterior walls.
• Leave gray and black valves closed and dump only when temperatures allow; a cracked valve ends the trip.
• Carry drinking water separately in jugs as insurance.

Moisture is the quiet problem

Cooking, breathing, and propane heat all release water vapor, and in a cold rig it condenses on windows and inside walls. Crack a roof vent even when it feels wasteful, run vent fans while cooking, and wipe down windows in the morning. A damp rig is colder, and persistent condensation leads to mold.

Carbon monoxide: the rule you do not bend

Cold weather is when carbon monoxide deaths happen, because people run engines, generators, and heaters in closed-up spaces. The Consumer Product Safety Commission's standing guidance is to operate portable generators outside only, at least 20 feet away, with exhaust pointed away from the living space — and that distance applies to an RV just as it does to a house. Keep a working CO detector with fresh batteries, test it before the trip, and if it alarms, get out first and investigate second.

Where winter dry camping works best

You do not have to fight deep cold to camp off-grid in winter. The deserts of southern Arizona and California are the traditional answer: mild days, cold but manageable nights, and enormous areas of public land open to self-contained campers. The Bureau of Land Management's Long-Term Visitor Areas run from mid-September to mid-April and exist precisely for this season. If you are staying north, start with short trips close to services, and check forecasts and road conditions right up to departure.