How to Prepare Your RV for Winter Storage in Washington
When camping season slows down and colder weather approaches, properly preparing your RV for winter storage is one of the most important things you can do to protect your investment.
Washington winters bring freezing nights, heavy rain, persistent moisture, wind, and long periods when your RV may sit unused. Without the right preparation, those conditions can lead to cracked plumbing, roof leaks, mold, pest damage, dead batteries, damaged tires, and expensive spring repairs.
Whether you own a travel trailer, fifth wheel, or toy hauler, following a complete RV winter storage checklist can help protect your camper until you are ready to travel again.
Here is how to prepare your RV for winter storage—and how the Tacoma RV Service Center can help you get it done before the first freeze.
Why Winter RV Storage Preparation Matters in Washington
Winter RV maintenance is about more than draining a few tanks and parking your trailer until spring.
Washington RV owners face several seasonal risks:
Freezing temperatures
Heavy and wind-driven rain
High humidity
Condensation and mold
Roof and seal deterioration
Rodents seeking winter shelter
Battery discharge
Tire damage
Long periods without inspection
A small amount of water left inside a plumbing line can freeze, expand, and damage fittings, faucets, pumps, or other components. A minor opening in an exterior seal can allow months of rain to enter the roof, walls, or floor.
Preparing your RV before cold weather arrives gives you time to find and address these problems before they become major repairs.
Freezing temperatures can cause serious plumbing damage, so review our complete guide to RV winterization in Washington before storing your trailer for the season.
1. Winterize the RV Plumbing System
Protecting the plumbing system is one of the most important parts of preparing an RV for winter storage.
Water expands when it freezes. If water remains trapped inside your RV’s pipes, valves, faucets, pump, toilet, water heater, or holding-tank components, that expansion can crack or damage them.
A complete RV winterization process may include:
Draining the freshwater tank
Emptying the gray and black holding tanks at an approved location
Draining the water heater after turning it off and allowing it to cool
Removing or bypassing water filters
Opening low-point drains
Clearing water from the plumbing lines
Bypassing the water heater when required
Circulating RV-safe antifreeze through the appropriate lines
Protecting sinks, drains, the toilet, and exterior water connections
Checking the water pump and related fittings
Never use automotive antifreeze in an RV freshwater system. Only use a product specifically labeled for RV or marine plumbing systems.
Winterization procedures vary by manufacturer, floorplan, appliance configuration, and plumbing design. Consult the owner’s manual or schedule professional service if you are unsure about any step.
Missing one connection could leave a vulnerable section of the system unprotected. For all your RV winterization needs, trust Tacoma RV Service Center to help protect your plumbing and prepare your trailer for colder weather—schedule your winterization appointment today.
2. Wash and Completely Dry the Exterior
Give your RV a thorough cleaning before placing it into storage.
Dirt, tree sap, bird droppings, road grime, insects, and organic debris can stain exterior surfaces or hide developing damage. Cleaning the trailer also gives you an opportunity to inspect areas you may otherwise overlook.
Wash the:
Roof
Front and rear walls
Sidewalls
Windows
Wheels
Undercarriage
Awnings
Slide-out walls
Storage-compartment doors
Use cleaning products approved for your RV’s materials. Avoid harsh chemicals that could damage finishes, rubber roofing, graphics, or seals.
Let the RV dry completely before covering it or closing it for an extended period. Storing a wet awning or trapping moisture under a cover can encourage mildew and staining.
3. Inspect the Roof, Seams, and Exterior Seals
Washington’s rainy season can turn a tiny sealing problem into serious water damage.
Inspect the roof and exterior carefully before storage. Pay particular attention to areas around:
Roof vents
Skylights
Air-conditioning units
Plumbing vents
Antennas
Ladder mounts
Roof edges
Windows
Entry doors
Storage compartments
Exterior lights
Slide-outs
Look for cracked or separating sealant, loose trim, damaged vent covers, gaps, soft materials, bubbling surfaces, stains, and other possible signs of water intrusion.
Do not assume a sealant is compatible simply because it is labeled waterproof. RV roofs and exterior components use specific materials, and the wrong product may fail to adhere or could damage the surface.
If you cannot safely access the roof or are unsure what needs attention, have it professionally inspected.
Pacific Northwest rain can expose even small sealing problems, so learn the warning signs of an RV roof leak before putting your trailer into winter storage.
4. Remove Food and Other Pest Attractants
An unused RV can look like ideal winter shelter to mice, insects, and other pests.
Remove all food, including items that may appear securely packaged. Rodents can chew through cardboard, paper, plastic, and thin storage containers.
Check:
The refrigerator and freezer
Kitchen cabinets
Pantry storage
Dinette compartments
Under-bed storage
Outdoor kitchens
Exterior compartments
Pet-food containers
Snack bags in tow vehicles or garages
Remove trash, paper goods, scented products, and anything else that might attract pests or provide nesting material.
Inspect openings where plumbing, wiring, propane lines, and other components enter the RV. Use appropriate pest-control materials or purpose-made screens where permitted, but never block an opening required for appliance ventilation or safe operation.
5. Clean and Dry the Interior
A clean RV is less likely to develop odors, pests, or mold during storage.
Vacuum floors, corners, furniture, cabinets, and hard-to-reach areas. Wipe down counters, tables, bathroom surfaces, and appliance interiors. Clean spills and crumbs that may have collected beneath cushions or inside drawers.
Defrost, clean, and dry the refrigerator and freezer. Leaving their doors slightly open can help prevent odors and mildew, provided the doors are secured so they cannot swing or become damaged.
Remove:
Food and beverages
Medications that may freeze
Toiletries sensitive to temperature
Damp towels and clothing
Bedding that could hold moisture
Valuable personal belongings
Electronics vulnerable to cold or humidity
Make sure the shower, sinks, appliances, cabinets, and floors are dry before closing the RV.
6. Control Moisture and Condensation
Moisture control is especially important for RV winter storage in Washington.
A trailer that appears dry when parked can still develop condensation as outdoor temperatures rise and fall. Moisture trapped inside can contribute to mildew, musty odors, corrosion, swelling, and damage to fabrics or wood products.
Consider using moisture-absorbing products in areas such as:
The kitchen
Bathroom
Bedroom
Closets
Storage compartments
Beneath sinks
Follow the manufacturer’s directions and check the containers regularly. Some moisture absorbers collect liquid and can spill if forgotten or improperly positioned.
Ventilation recommendations vary by RV and storage conditions. Follow the RV manufacturer’s instructions rather than leaving windows or vents open without considering wind-driven rain, pests, and security.
Before months of Pacific Northwest rain arrive, use our fall RV maintenance guide to check seals, manage moisture, and prepare your trailer for Washington’s wet season.
7. Prepare the RV Battery for Storage
Batteries can lose their charge while an RV is sitting, even when you believe everything is turned off. Small electrical loads may continue drawing power until the battery becomes deeply discharged.
Battery-storage requirements depend on whether your RV uses flooded lead-acid, AGM, or lithium batteries.
General preparation may include:
Fully charging the battery
Checking terminals for corrosion
Cleaning and tightening connections
Disconnecting the battery when appropriate
Using a compatible maintainer
Checking the charge periodically
Following temperature requirements for the battery type
Do not use a charger designed for lead-acid batteries on a lithium battery unless the manufacturer specifically approves it.
Lithium batteries may have different recommended storage charge levels and temperature limits. Always follow the battery manufacturer’s directions.
8. Inspect Tires, Wheels, Bearings, and Brakes
Your RV’s running gear still requires attention even when the trailer is not moving.
Before storage:
Check tire pressure
Inspect tread and sidewalls
Look for cracks, bulges, or unusual wear
Verify the tires’ age
Inspect wheels and lug nuts
Consider whether wheel-bearing service is due
Check visible brake and suspension components
Use tire covers when appropriate
Park on a firm, well-drained surface
Do not rely on a tire’s appearance alone. RV tires can age and deteriorate before the tread is worn down.
Follow the RV and tire manufacturers’ storage recommendations. Do not overinflate tires or use improvised supports that could damage the frame or create an unstable trailer.
Think RV tires, bearings, and brakes only need attention after a problem appears? Our RV maintenance myths guide explains why preventative service matters even when your trailer spends part of the year in storage.
9. Secure the Propane and Electrical Systems
Turn off propane appliances and close the propane-cylinder valves before storage unless the manufacturer or storage facility provides different instructions.
Inspect cylinders, hoses, regulators, and visible connections for deterioration or damage. Propane-system repairs and leak testing should be performed by a qualified professional.
If your RV is connected to shore power during storage, confirm that the electrical source, cord, adapters, surge protection, and charging equipment are appropriate for unattended use.
If shore power will be disconnected, make sure the electrical system and battery are prepared accordingly.
Check the storage facility’s rules, as some locations have specific requirements concerning propane cylinders, batteries, or electrical connections.
10. Retract and Secure Exterior Equipment
Before leaving your RV in storage, retract or secure anything exposed to wind and weather.
This includes:
Awnings
Slide-outs
Entry steps
Stabilizers, as directed
TV antennas
Exterior cooking equipment
Outdoor rugs
Portable solar panels
Hoses and electrical cords
Clean and dry awnings before retracting them. Remove leaves, pine needles, and other debris from slide-out roofs and seals.
Lock exterior compartments and confirm that doors, windows, emergency exits, and access panels are completely closed.
11. Choose a Secure Storage Location
Whether your RV will be stored at home or at a commercial facility, think carefully about security and drainage.
Look for:
Gated access
Adequate lighting
Security cameras
Controlled entry
A stable parking surface
Good drainage
Enough clearance around the RV
Rules designed for RV storage
Use appropriate hitch locks, coupler locks, kingpin locks, wheel locks, or other security products based on your RV type.
If you use an RV cover, choose one designed for RV storage that fits properly and allows suitable airflow. Loose tarps can flap in the wind, trap moisture, and damage exterior finishes.
12. Check Your RV Throughout the Winter
Winter preparation is not finished the moment you lock the door.
Inspect your RV regularly, especially after freezing temperatures, high winds, heavy rain, or snow.
During each visit, check for:
Roof or ceiling leaks
Water beneath the RV
Cover damage
Pest activity
Unusual odors
Condensation
Tire-pressure changes
Battery condition
Damaged vents or exterior components
Signs of theft or tampering
Finding a problem in December is better than discovering months of damage in April.
Keep a simple storage checklist so you can record inspection dates, battery readings, moisture-control replacements, and any repairs that need attention. Keep this guide handy by downloading your own printable RV Winter Storage Checklist before preparing your RV for the season.
Professional Winterization Can Prevent Expensive Mistakes
Winterizing an RV may sound straightforward, but today’s travel trailers, fifth wheels, and toy haulers can contain complex plumbing layouts, outdoor kitchens, washing-machine connections, ice makers, tank-flush systems, multiple bathrooms, and other components that are easy to overlook.
Professional winterization can help ensure that:
Water is removed from vulnerable areas
The proper bypass procedures are followed
RV-safe antifreeze reaches the necessary components
Obvious leaks or damage are identified
Your RV receives attention appropriate for its design
Appointments can fill quickly when the first freezing forecast appears. Scheduling early gives you more flexibility and helps protect your RV before temperatures drop.
Prepare Your RV at Tacoma RV Service Center
Tacoma RV Service Center helps Washington RV owners prepare travel trailers, fifth wheels, and toy haulers for cold weather and seasonal storage.
Our experienced service team can assist with winterization, inspections, roof and seal concerns, plumbing repairs, bearing service, electrical diagnostics, appliance service, and other preventative RV maintenance.
Preparing now can help you avoid discovering cracked plumbing, water damage, dead batteries, or neglected maintenance when camping season returns.
Schedule your RV service before freezing temperatures arrive.
Tacoma RV Service Center
8507 Pacific Hwy E
Tacoma, WA 98422
(253) 455-7837
Schedule Service: Request an RV service appointment
Make Spring RV Preparation Easier
A well-prepared RV is easier to reopen when warmer weather returns.
When spring arrives, you will still need to inspect the trailer, flush and sanitize the plumbing system, check tires and batteries, test appliances, examine seals, and verify that the brakes and lights work correctly.
However, proper winter storage can reduce unpleasant surprises and help you return to camping sooner.
When camping season returns, use our spring RV maintenance checklist to inspect your trailer, test its systems, and get ready for another summer of Pacific Northwest adventures.
Protect Your RV Before Winter Arrives
Your RV represents countless future camping trips, weekends with family, and adventures throughout Washington and the Pacific Northwest.
Protecting it through winter does not happen automatically.
A complete RV winter storage checklist should address the plumbing system, roof, exterior seals, battery, tires, moisture, pests, propane equipment, security, and ongoing inspections. Skipping even one important area could lead to costly damage before spring.
Start early, follow the instructions for your specific RV, and ask for professional assistance when you are uncertain.
Tacoma RV Center is here to help you protect your camper during the offseason so it is ready when the next adventure begins.
Do not wait for the first hard freeze. Prepare your RV for winter storage now and enjoy greater peace of mind all season long.
