How to Winterize an RV: A Step-by-Step Guide for Cold Weather

Protect your RV’s plumbing and prepare it for storage with a careful, manufacturer-approved winterization routine.

Winterizing an RV means more than draining the freshwater tank. Water can remain in faucets, pumps, low-point drains, toilet valves, water heaters, filters, and appliance lines. If that water freezes, it can expand and damage plumbing or equipment. This guide covers a common process, but RV layouts and components differ. Your RV and appliance manuals take priority; when a step is unclear, ask a qualified RV technician rather than guessing.

What you’ll need

• Your RV owner’s manual and manuals for installed appliances.
• Non-toxic RV/marine antifreeze labeled for potable-water systems, if using the antifreeze method.
• A winterizing pickup tube or hand pump, if your RV requires one.
• A blowout plug and compressor with a regulator, only if your RV manufacturer permits compressed-air winterization.
• Towels, a shallow pan, gloves, and the tools specified by your manuals.

Never use automotive engine antifreeze in the RV’s drinking-water system. Do not use unregulated compressed air or exceed the pressure specified by the RV and appliance manufacturers.

Step 1: Prepare the RV and shut off utilities

1. Choose a level parking or storage spot and remove food, toiletries, and anything that could freeze or attract pests.
2. Disconnect the city-water hose and turn off the water pump.
3. Turn off the water heater’s electric and propane heat sources. Let the water heater cool completely and relieve water pressure before draining it. Never drain a hot or pressurized water heater.
4. Follow the RV manual for shore power, propane, batteries, and any equipment that needs power during storage. Do not disconnect systems blindly if the RV requires battery maintenance or a powered monitor.

Step 2: Drain the freshwater system

1. Drain the freshwater tank as the RV manual directs.
2. With the water heater fully cool and depressurized, remove its drain plug or anode rod as specified by the manufacturer. Keep the plug and anode safe for spring reinstallation.
3. Open the low-point drains. Open faucets on both hot and cold settings, including the bathroom sink, shower, and outside shower if equipped. Flush the toilet and operate sprayers or other water fixtures to release trapped pressure and water.
4. Remove or bypass water filters as directed. A filter cartridge can trap water and may need to be discarded or stored indoors.
5. Put the water heater in bypass before using RV antifreeze. Antifreeze should not be sent into the water heater unless the manufacturer specifically directs it.

Step 3: Choose one approved method for the water lines

RV owners commonly winterize plumbing with potable-water antifreeze or regulated compressed air. Use the method approved for your RV. Some systems require a combination of steps to protect pumps, valves, and drains.

Option A: Use RV potable-water antifreeze

1. Close the low-point drains after draining, and confirm the water heater is bypassed and filters are removed or bypassed.
2. Connect the RV’s winterizing pickup tube or a hand pump exactly as instructed in the manual. Use only non-toxic RV/marine antifreeze labeled for potable-water systems.
3. Turn on the water pump only as the approved procedure directs. Open one faucet at a time, first on cold and then on hot, until the antifreeze appears. Close each faucet before moving to the next.
4. Repeat for the bathroom sink, shower, outside shower, toilet flush valve, sprayers, and every other water fixture. Follow separate instructions for ice makers, refrigerators with water dispensers, dishwashers, washing machines, and other appliances; do not assume the main plumbing procedure protects them.
5. Protect sink and shower drain traps as directed by the RV manual, typically by adding the specified amount of RV antifreeze to each trap. Do not pour antifreeze into the freshwater tank or an appliance unless its manufacturer explicitly says to do so.

Option B: Use regulated compressed air

1. Use a blowout plug at the city-water inlet and set the regulator to the pressure specified by the RV manufacturer. If the manual does not provide a safe procedure or pressure, stop and ask an RV technician.
2. Keep the water pump off. Open one faucet at a time, hot and cold, and allow air to clear the line. Then close it and move to the next fixture.
3. Include the toilet valve, outside shower, sprayers, and other connected plumbing. Follow the manual for low-point drains and any pump or appliance that could retain water.
4. Remember that compressed air may not clear every pump, valve, filter, or appliance. Protect drain traps and any components that the RV manual says still need antifreeze.

Never use an unregulated compressor or apply more pressure than the system is designed to withstand. If air sputters or a fixture appears blocked, do not force the issue; consult the manual or a technician.

Step 4: Empty and protect the holding tanks and drains

1. Empty the black and gray tanks at an approved dump station, and rinse the black tank using the RV’s built-in system or an approved wand.
2. Close the tank valves and follow the manufacturer’s directions for tank treatment and storage.
3. Check P-traps, sink drains, shower drains, and other low spots. Protect traps with RV antifreeze only as directed; emptying the freshwater lines does not automatically protect the drain system.

Step 5: Handle special equipment separately

Water-using appliances often have their own winterization instructions. Ice makers, residential refrigerators, dishwashers, washers, washer-dryer combos, water filters, outdoor kitchens, and water softeners may contain small valves or pumps that are not cleared by the standard faucet procedure. Follow the exact model manual. Do not pour antifreeze into an appliance or run it with antifreeze unless its manufacturer explicitly approves that method.

Step 6: Finish preparing the RV for storage

• Clean and dry the refrigerator and freezer; leave doors positioned as the manual recommends.
• Protect batteries, tires, awnings, roof vents, and propane equipment according to their manufacturer instructions.
• Remove valuables and moisture-sensitive belongings. Use ventilation or moisture control suitable for the RV, and avoid sealing the coach so tightly that condensation becomes trapped.
• Use a properly fitted, breathable RV cover if desired. Check it periodically and keep vents clear as recommended.
• Label bypass valves and write down the method used, the antifreeze product, and any components that need spring attention.

Step 7: De-winterize before your next trip

In spring, restore valves and filters according to the manuals. Flush and sanitize the potable-water system as the RV manufacturer directs, then inspect every connection for leaks. Refill the water heater completely and purge air from the lines before turning on its electric element or propane burner. Clean appliance filters and run test cycles only after their water supplies are restored.

Final check

A successful winterization is a complete, documented process—not simply a tank drained or a few faucets opened. Work through every water-using fixture, protect traps and appliances separately, and follow the exact pressure and antifreeze instructions for your RV. When in doubt, pause and get qualified help; preventing one cracked fitting can save a costly repair when camping season returns.

Quick winterization checklist

• Water heater off, cooled, depressurized, drained, and bypassed as directed.
• Freshwater tank, low-point drains, faucets, shower, and toilet addressed.
• Water filters removed or bypassed; appliances checked against their own manuals.
• Either approved potable-water antifreeze or regulated air used as specified.
• Black and gray tanks emptied; drain traps protected as directed.
• Batteries, tires, vents, awnings, and storage items prepared for the season.
• Valves labeled and spring startup steps recorded.