Winter demands respect from RV owners. Water expands as it freezes, which is enough to crack fittings, split valve bodies and destroy water pumps. Preparing before a freeze gives you time to locate valves, gather supplies and arrange service for equipment you cannot safely handle yourself.

This guide walks through choosing a winterization method, picking the right antifreeze, step-by-step procedures by RV type, battery storage, tire care, exterior protection and spring de-winterization, with a printable checklist to keep by your side.

Quick Winterization Checklist

Print this list and check items off as you go. Full instructions for each step are below.

• Identify your RV type, water heater brand and battery chemistry first; the steps below branch by what you actually have (see Identify Your Setup)
• Drain the fresh, gray and black tanks at an approved dump station, and flush the black tank thoroughly
• Power off the water heater, let it cool, then depressurize before opening any drain; tank-style and tankless units are not the same procedure, so confirm which you have
• Remove or bypass any inline water filter before running antifreeze
• If using the documented antifreeze method, close the fresh water tank drain and every low point drain before you start, then protect each listed fixture and drain trap; keep bypassed equipment isolated as its manufacturer requires
• Check cold tire inflation against the RV and tire manufacturers’ instructions; do not substitute a generic storage-pressure rule
• Set the battery to its manufacturer’s recommended storage charge and mode; confirm the wiring and disconnect procedure before touching cables
• Inspect roof seams and trim from a safe vantage point and reseal with the product your roof material calls for; if you use AC/vent covers, size them to your equipment and never block a vent on an appliance still in use
• Fit an RV cover sized and shaped for your model
• Park on firm, well-drained ground, away from trees
• If any of this feels outside your comfort zone, your local dealer can do it for you

Understanding What Freezes and Why

Water left in a line, pump, filter housing or valve can freeze and damage the plumbing. Empty holding tanks do not prove that these smaller spaces are protected. A faucet that runs dry also does not tell you whether a separate appliance line or exterior shower still contains water.

Work from a fixture inventory rather than memory. Walk around the outside as well as through the living area, and include equipment added after the RV left the factory. Mark each item complete only after you have followed its winterization procedure.

Choosing Your Method: Air vs. Antifreeze

Use the winterization method documented for your RV and its installed equipment. Some instructions use antifreeze, some use regulated compressed air and some combine steps. A method for the main supply lines does not automatically protect drain traps, pumps, filters or appliances.

The 2027 Jayco Towable Owner’s Manual includes separate antifreeze and air-pressure procedures. Those procedures are examples for the equipment covered by that manual, not a universal recipe for every motorhome or trailer. If your manual does not identify an air method, do not improvise a compressor connection or choose a pressure from another RV’s instructions.

Before starting, confirm how the water heater is isolated or drained and how the pump and drain traps are protected. If an aftermarket fitting or missing diagram leaves that unclear, a dealer can identify the correct procedure before anything is connected.

Choosing the Right Antifreeze

This is the most important decision in the process, and the one most prone to a dangerous mistake.

Never use automotive antifreeze (ethylene glycol) or windshield washer fluid (methanol) in your RV's water system. Both are toxic and potentially fatal if ingested. They belong in engine cooling systems and washer reservoirs, not anywhere near drinking water plumbing. There are no exceptions to this rule.

Use a product explicitly labeled for winterizing RV potable-water systems and compatible with the equipment it will contact. Follow both its label and your RV’s instructions for concentration, protection rating and flushing before the system returns to drinking-water use. Do not treat a “non-toxic” label as permission to drink the product.

How much you need: use the quantity specified for your plumbing layout and approved method. Make a list of faucets, exterior fixtures, drain traps and water-using appliances before shopping. Extra fixtures or a different winterization method can change consumption. Keep enough product available to finish the documented procedure without diluting it to stretch the supply.

Identify Your Setup Before You Start

Winterizing steps branch by what's actually in your RV. Spend five minutes confirming these before you touch a valve, and the rest of this guide will apply more directly to your rig:

1. RV type. Towable (travel trailer, fifth wheel) or motorized (Class A/C)? Any RV can have equipment that needs separate instructions; the motorhome section below explains how to account for it.
2. Water heater brand and type. Check the data plate on the unit itself, usually behind the exterior access door, and write down both the brand and whether it is a tank or an on-demand (tankless) unit. Do not infer the type from the brand, because several manufacturers build both. That exact brand and model is what decides whether you set a bypass valve, run antifreeze through the unit or drain it down instead. The three are not interchangeable and the wrong one can damage the heater, so look up your model's current winterizing instructions on the manufacturer's own support site; your RV manual's component list will tell you which manufacturer to go to.
3. Inline water filter. Do you have one, and where is it? The cartridge needs to come out of its housing before antifreeze runs through the lines.
4. Residential appliances. Washing machine, residential ice maker or macerator toilet system? Each needs its own manufacturer's winterizing steps. Your RV manual may only tell you that the appliance has to be protected, not how to do it.
5. Battery chemistry. Lead-acid, AGM or lithium (LiFePO4)? Charging behavior, cold-weather limits and storage/disconnect needs differ by chemistry; check your battery's own documentation, not just the RV manual.
6. Utility center vs. individual valves. Does your plumbing use a single labeled panel (a utility center) or separate valves at the pump? It changes which handles you move, and whether a labeled winterize route exists on your panel at all.

Once you know these six things, the sections below tell you which steps apply to your setup and which manual governs the ones this guide can't specify for you.

Step-by-Step Winterization Procedures

General Preparation (All RV Types)

Before any model-specific steps, complete these:

1. Drain all holding tanks — fresh, gray and black — at an approved dump station, and flush the black tank thoroughly to clear waste buildup before storage.
2. Shut down and cool the water heater before draining. Turn off its energy sources as instructed, allow it to cool and isolate the pump and incoming water supply. Relieve water pressure using the heater manufacturer’s specified procedure before loosening a drain plug or opening a drain. A hot or pressurized heater can discharge scalding water. If you cannot identify the shutdown and pressure-relief steps for your unit, stop and have it serviced.
3. Remove any inline water filter. Antifreeze can damage charcoal filter media, so pull the cartridge out of its housing before you start. The Jayco family towable manual also warns that antifreeze should never reach the tank water heater, the water filter, the refrigerator or a refrigerator water filter, so account for each of those before you run any product through the lines. If your plumbing genuinely cannot carry flow with the cartridge out, have the dealer confirm the right arrangement rather than improvising a bypass.
4. Use the water heater’s own winterization method. A tank or tankless label alone does not determine whether antifreeze may pass through it. For example, Truma’s AquaGo instructions call for cooling and depressurizing the unit, placing it in bypass and draining it with the Easy Drain Lever. Truma advises against high-pressure air or antifreeze in the unit and specifies an installed bypass kit when antifreeze is used in the plumbing. Other heaters have different requirements. Identify yours before connecting air or antifreeze.

Travel Trailers and Fifth Wheels With a Documented Antifreeze Setup

The sequence below describes the main tasks in the Jayco towable antifreeze method. Complete the draining and equipment-isolation steps first, and use your own manual for valve positions, fixture sequence and completion steps.

1. Close the drains, then connect the antifreeze supply. Close the fresh water tank drain and every low point drain first. The manual is explicit that the pump cannot create suction while a low point drain is still open, so a run started with one open simply will not distribute. Then locate the pump’s siphon connection using the plumbing diagram, set the documented valve positions and place the siphon hose in the approved product. Do not disconnect an unidentified hose to create an improvised intake.
2. Run the pump and distribute. The manual's sequence is hot side first: open the hot water faucets, including the outside shower if equipped, until RV antifreeze flows continuously, then close them and repeat with the cold water faucets. Hold the toilet lever open until antifreeze runs into the bowl. Working one side at a time is what tells you a line is genuinely full rather than still pushing water ahead of the antifreeze.
3. Protect the P-traps. With the pump off, pour antifreeze into each sink, shower or tub drain — the towable manual calls for one cup per trap, so use your own manual's figure if it differs. This is what keeps trapped water from freezing and cracking the fitting, and it is easy to forget precisely because it never involves the pump.
4. Wipe up afterward. Antifreeze can stain sinks, tub surfaces and the toilet bowl; a soft, dry cloth right away prevents that.

Fifth Wheels and Trailers With a Centralized Utility Center

Many current towables route the plumbing through a single labeled panel — a utility center — instead of separate valves scattered around the rig. Do not assume yours has a winterize position. In the 2027 Jayco family towable manual, which Open Range publishes for its own trailers as well, the Open Range Basic Utility Center carries only Tank Fill and City Fill settings, while the Open Range Fifth Wheel Utility Center and the Nautilus panels do have a labeled Winterize position that draws from the suction or siphon inlet instead of the fresh water tank.

Do not assume the panel handles the water heater for you either. On the Open Range Fifth Wheel Utility Center, Water Heater Bypass is its own separate labeled setting that you have to select. On a Nautilus panel the winterize valve configuration is designed to bypass the water heater, which is the wrong outcome if yours is a tankless unit that needs antifreeze to circulate through it — that manual's instruction for a tankless heater on a Nautilus panel is to use the City Fill position instead, and a Truma AquaGo takes neither route. Settle the water-heater question from the step above before you move a single handle.

Find your exact panel by name in the utility-center section of your own manual rather than guessing at a label. The panel changes which handles you move; it does not change what still has to be protected.

Class A and Class C Motorhomes

The plumbing steps above — draining tanks, protecting the water heater by whatever method your specific unit's manual calls for, protecting supply fixtures and drain traps — apply to motorhomes the same way they apply to towables. Where motorhomes differ is the residential-style appliances some models carry: washing machines, ice makers and, on some models, macerator toilet systems. Each has its own winterizing procedure set by the appliance manufacturer, not the RV manufacturer, and getting it wrong on an appliance is a different failure mode than getting it wrong on a length of tubing. Check the appliance's own manual before improvising a procedure for it. If your coach uses a macerator, antifreeze needs to reach that system too, since water can sit in its hose and dump connector; consult your coach's plumbing diagram for the exact valve.

Compressed Air as a Supplement

An air procedure requires the correct inlet, regulator setting, fixture sequence and water-heater isolation for that specific RV. Do not substitute an unregulated compressor or copy another model’s pressure limit. Finish any separate pump, drain-trap and appliance protection steps listed in the manual. If you cannot confirm those steps, ask the dealer to winterize the system rather than treating dry faucets as proof the job is complete.

Battery Maintenance During Storage

Read the label to identify the battery model and chemistry, then find its storage instructions. Lead-acid, AGM and lithium batteries can have different charge targets, temperature limits and storage modes. A voltage figure or charging rule from another battery is not a substitute.

Record three things on your storage checklist:

• The required storage state: charge target, storage mode and whether a compatible charger should remain connected.
• The disconnect procedure: which circuits remain active and how battery, solar and shore-power sources are isolated in the proper order.
• The follow-up schedule: when to inspect charge state and what conditions require recharging or service.

Do not assume a battery-disconnect switch isolates every circuit. If you cannot identify the wiring or safely follow the procedure, have the dealer prepare the system. Battery cable work and solar-controller connections are not tasks to guess through.

Solar Panels During Storage

A cover, shade or snow can change solar charging during storage. Confirm that the controller supports the installed battery and that its settings match the battery documentation. Follow the system manufacturer’s connection and isolation order if a change is needed; covering panels does not by itself establish a universal disconnect procedure.

Tire Care During Storage

Inspect tires before the RV goes into storage so damage can be addressed before the next trip. Note cracks, cuts, bulges or unusual wear and have questionable tires evaluated by a tire professional.

Check cold inflation using the RV and tire manufacturers’ instructions. The vehicle certification label and tire sidewall serve different purposes; do not automatically substitute the sidewall maximum for the RV’s specified pressure. If tires, loading or equipment have changed, have the correct inflation and load limits confirmed. Storage does not make an overloaded axle or unsuitable tire acceptable.

Use the tire manufacturer’s storage guidance for covers, ground contact and any recommendation to move or support the RV. Do not lift or support an RV on an improvised arrangement to take weight off its tires.

Exterior Protection and Storage

Sealant, Covers and Storage Site

Inspect seams, roof openings and exterior trim from a safe position. Look for damaged or separated sealant and signs of water entry. Roof access depends on the RV’s construction and the available safety equipment; being comfortable on a ladder does not establish that the roof is walkable.

Before applying anything, identify the roof material and the sealant or treatment approved for that specific surface. Generic silicone, conditioner or lap-sealant advice can be wrong for a particular system. A dealer can identify the materials and handle repairs where access or compatibility is uncertain.

If you use covers for roof vents or the AC unit during storage, use ones sized and vented for your specific vent/unit model per the cover manufacturer's instructions; an incompatible cover can trap moisture or restrict airflow instead of protecting the equipment. Never cover or restrict a vent tied to an appliance you're still operating, including a furnace, water heater or refrigerator; those vents need to stay clear whenever the appliance has power or fuel to it.

A well-fitted cover shields against snow, rain, UV and debris. Fit matters as much as material: a universal-fit cover billows in wind and can abrade paint over a season, while one cut for your specific model stays put.

Park on firm, well-drained gravel or pavement rather than grass, which traps moisture against the underside. Avoid parking under trees, since falling branches, sap and bird droppings all cause damage, and orient the RV to minimize wind load on the cover.

De-Winterization: Spring Recommissioning

Reversing winterization is its own multi-step process — flushing antifreeze from every line, sanitizing the fresh water tank, reinstalling the water heater drain plug and filter, resetting bypass valves and checking every fitting for leaks before you trust the system again. Rushing this step is how spring camping trips start with a wet cabinet floor instead of a road trip.

We cover the full spring process, including tank sanitizing steps, step by step in our companion guide: RV De-Winterization: A Complete Step-by-Step Guide for Spring.

Winter Living Modifications

Using the RV through freezing weather requires a different plan from draining it for storage. First confirm whether the RV and each water-using component are intended for the temperatures you expect. Heated tanks or an enclosed underbelly do not establish unlimited cold-weather protection.

Make a plan for dependable heat, power and fuel, including what happens during an outage or an unplanned absence. Heated hoses and tank heaters must be used within their own ratings and installation instructions. Keep furnace, water-heater and refrigerator vents clear, and maintain the alarms required by the RV’s manual.

If you use skirting or a cover, confirm that it does not obstruct required ventilation, exhaust or access. Do not improvise a fuel-burning heater under the RV or use an appliance for a heating purpose it was not designed for.

When conditions exceed the RV’s documented capability, or you cannot maintain protection reliably, stop using the water system and follow its winterization instructions. Planning that decision before a cold snap is more useful than assuming the interior thermostat protects every exterior line. For trips built around cold weather, see our guides to Colorado ski trips by RV and winter RV camping in national parks.

Getting Expert Help

A clear equipment list and the right manuals make winterization easier to plan. Your owner's manual is the best source for the exact valve locations and utility-center layout on your specific model, since those details vary enough between RVs that no general guide can cover every configuration.

If you'd rather have it handled, or you hit a step that doesn't match what you're seeing on your rig, your local dealer has the equipment and model-specific knowledge to take care of it. Find your local dealer to schedule winterization service or ask questions about your RV's specific setup.

Technician Handoff Checklist

Handing the job to your dealer or a mobile RV tech? Give them this up front and the job goes faster:

• Year, make, model and VIN/serial number
• Water heater brand/model, from the data plate on the unit
• Whether an inline water filter is installed, and where
• Battery chemistry (lead-acid, AGM or lithium) and whether it's factory or aftermarket
• Any residential appliances (washer, ice maker, macerator) and their brand/model
• Any method or product restrictions stated in the RV and component manuals
• Any known issues from last season — a slow drain, a valve that doesn't seat, a heater that never came up to temperature

Having this ready means the tech isn't tracing your plumbing from scratch, and you're less likely to get a generic service instead of one scoped to your rig.

Frequently Asked Questions

How much RV antifreeze do I actually need? There is no single figure, because it scales with your plumbing rather than with the size of the RV. Build the number from your own fixture count: every faucet you will run hot and cold, the toilet, any outside shower or outdoor kitchen and one cup for each sink, shower or tub trap. Buy above that total rather than at it. Running short part-way through leaves a line unprotected, and diluting a ready-to-use product to stretch it gives up the freeze protection you paid for.

Can I winterize with compressed air alone? Only use an air method where your RV and equipment instructions permit it. Check the separate protection steps for the pump, traps and appliances. Dry faucets alone do not prove those components are ready for freezing weather.

Do I still need to winterize if I use my RV through winter? You need a documented freeze-protection plan while the water system remains in use. If conditions exceed the RV’s capability or reliable heat and power cannot be maintained, follow the winterization procedure before freezing can damage the system.

How do I winterize a washing machine or residential ice maker? Use the instructions for that specific appliance model. It may have lines, valves or pumps that the main plumbing procedure does not protect. Add it to the dealer’s work order if the steps are unclear.

When should I winterize? Prepare before freezing temperatures can reach the plumbing, rather than waiting for repeated freezes or a particular month. Check the forecast for both your storage location and any route you will travel. Allow time to arrange service before the first cold-weather deadline.