Improper winterization is one of the leading causes of preventable RV damage. Here's a complete checklist to protect your investment through the off-season.
When camping season ends in Arkansas, Missouri, and Oklahoma, most RV owners face the same task: preparing their RV for winter storage. Done correctly, winterization protects your water systems from freeze damage and ensures your RV will be ready to use when spring arrives. Done incorrectly — or skipped entirely — a single overnight freeze can crack pipes, destroy the water pump, and damage your fresh water tank, costing thousands to repair.
Water System Winterization
The primary goal of winterization is to remove all water from the plumbing system so there's nothing to freeze and expand. There are two methods: using compressed air to blow out the lines, or pumping non-toxic RV antifreeze (propylene glycol) through the system. Many RV owners use a combination of both.
- Drain the fresh water tank completely
- Drain the water heater (with power off and water cooled)
- Open all low-point drain valves
- Drain black and gray holding tanks and add antifreeze
- Blow out water lines with compressed air or pump with RV antifreeze
- Pour antifreeze into each drain, toilet, and any P-trap
- Disconnect and drain the washing machine if equipped
Battery and Electrical Preparation
Cold temperatures significantly reduce battery capacity and can damage batteries that are stored in a discharged state. For lead-acid batteries, either remove them and store them in a climate-controlled space on a trickle charger, or connect a battery maintainer to keep them at full charge throughout the winter. Lithium batteries can be stored at a partial charge (around 50%) and tolerate cold temperatures better than lead-acid, but should not be charged in freezing temperatures.
LP System and Appliance Care
Turn off all propane appliances and close the tank valve. Leave interior cabinet doors open to improve air circulation and reduce the chance of moisture buildup. Run the refrigerator in electric mode if available, or clean it thoroughly and leave the door propped open with a box of baking soda inside to prevent mold and odors.
Exterior Preparation
Clean and inspect the roof and reseal any cracked or missing sealant before storage. A roof that leaks all winter can cause far more damage than a freeze. Lubricate slide-out seals with a silicone-based lubricant, and cover the RV if possible to protect against UV damage, debris, and moisture.
De-Winterization in the Spring
Before your first trip of the season, flush the water system thoroughly to remove all antifreeze, test all appliances, reconnect the battery, check tire pressure and condition, and inspect the roof seals again. Consider having a professional spring inspection done every few years to catch any developing issues before they become expensive problems during camping season.