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San Antonio winters are gentle enough that plenty of RV owners skip winterizing entirely. That works until one cold night drops below freezing and a water line or tank valve splits. Two focused hours before the rig goes into storage can prevent most of that damage and make spring startup far less expensive.
The checklist below is built for a typical travel trailer, fifth wheel, or motorhome. Work through it in order, and keep your owner’s manual nearby because every rig routes water and fuel a little differently.
Sorting tools takes time out of the two hours, so stage everything before you start. For most rigs you will need RV antifreeze, holding tank treatment, fuel stabilizer, weather stripping or draft blockers, an RV cover, gloves, a bucket, and a flashlight. If your water heater does not already have a bypass, sort that out before the day you plan to winterize.
Open the owner’s manual and mark three things: the low-point drains, the fresh tank drain, and the water heater bypass. Every rig routes water a little differently, and guessing wastes time. If the plumbing side feels like more than you want to handle, hiring a professional is a legitimate option, and one source puts the typical cost at $130 to $170.
The sequence below moves from the cabin to the tanks, then the water system, fuel, seals, and cover. Follow it in order and the two hours go quickly.
Start with everything that could spoil, smell, or feed a rodent. Pull all food and perishables, take out the trash, and give the interior a quick clean and inspection. Check cabinets, the fridge, under cushions, and storage bays for crumbs or anything left behind. Pests are one of the main reasons a stored RV comes back with a problem, and an empty, clean cabin gives them less reason to move in. This is also a good time to note anything that needs repair before spring.
Empty the black and gray tanks first, then rinse them. Once they drain, add the appropriate holding tank treatment and a small amount of antifreeze to protect the valves. The tanks themselves are only part of the job. A valve that holds a little water in the wrong place can crack when temperatures drop, and that turns into a repair before your first trip of the season. Close the valves when you finish and confirm nothing is dripping.
Open the fresh water tank drain and let it empty completely. Then clear the water lines so no water sits in the plumbing. Low-point drains are the usual starting point, and the manual will show where yours are located. Give the system time to finish draining instead of rushing to the next step. Any water left in a line is water that can expand when it freezes, so patience here does real work.
Bypass the hot water heater before adding antifreeze. The bypass keeps antifreeze out of the heater tank and keeps that tank from being filled with a product it does not need. With the bypass set, run antifreeze through the lines and traps until it shows at each faucet, the shower, and the toilet. Traps under the sinks deserve extra attention because they hold water that is easy to overlook. When you finish, confirm every fixture has been opened and closed and that the bypass is set the way the manual describes.
Fill the fuel tank, add stabilizer, and run the engine so treated fuel works through the system. If your rig has a generator, treat it the same way. Stabilized fuel helps the engine start after months of sitting, and running it after adding the product is what moves the treatment beyond the tank. Write down what you added and the date so spring prep does not depend on memory.
Cold air enters through doors, slide-outs, and storage compartments. Walk the exterior and seal gaps with weather stripping or draft blockers. Look closely at slide-out corners and the seals around compartment doors, since those are common leak points. This step does double duty. It keeps cold air out of the cabin and makes it harder for pests to find a way in.
Finish with a cover. A cover keeps leaves, dust, and weather off the roof and sides, and it is one of the most frequently recommended storage steps. Secure it so wind cannot work it loose. Then do a final walk-around: tanks closed, antifreeze in the traps, food gone, cabinets shut, and nothing left outside that could blow away or hold water. Lock up and note the date you finished.
A shop can handle the whole job, and one source puts professional winterizing at roughly $130 to $170. That price buys back your afternoon. The tradeoff is that you learn less about your own systems, which matters when something needs attention at a campsite far from home. The table below lays out the basic decision.
| Factor | Do It Yourself | Hire a Professional |
|---|---|---|
| Time | About two hours with this checklist | Drop-off and pickup time |
| Cost | Supplies such as antifreeze, treatment, and stabilizer | Roughly $130 to $170 according to one source |
| What you learn | Where the drains, bypass, and valves are located | Less hands-on familiarity with your rig |
| Good fit for | Owners with a manual and some confidence | Owners short on time or unsure about plumbing |
Once the RV is dry, treated, and covered, where it sits matters. A covered space keeps sun and weather off the roof and cuts down on the cleanup in spring. San Antonio RV & Boat Storage near Culebra Rd and Alamo Ranch offers covered and uncovered spaces for Class A and Class C motorhomes, fifth wheels, and travel trailers, with pull-thru spaces up to 90 feet. That pull-thru layout helps if you are not comfortable backing a long rig into a tight spot.
San Antonio does not usually deliver the long, hard freezes that RV owners in colder states plan around. That is exactly why winterizing gets skipped here. A mild winter does not rule out a freeze, though, and the parts most likely to fail are the ones you cannot see: water lines, the water heater, and tank valves. Two hours now is cheaper than a plumbing repair later, and the same checklist also handles the food, pest, and interior prep that storage requires anyway.
When travel season returns, start dewinterizing a few days before your first trip. Test the systems at home or at your storage site, restock the RV gradually, and plan a short first trip to shake out anything that needs attention. That approach turns a potential first-day surprise into a minor fix in the driveway instead of a breakdown on the road.
With supplies staged and the steps followed in order, a typical RV takes about two hours using this checklist. First-timers often need longer while they locate the drains, the water heater bypass, and the tank valves. A professional can handle it, and one source lists professional winterizing at $130 to $170.
Yes, if there is any chance of freezing temperatures while the RV sits. San Antonio winters are mild, but a single cold night can damage water lines, the water heater, and tank valves. Draining the system and adding antifreeze is inexpensive insurance, and the process also covers the food, pest, and interior prep that storage requires anyway.
Always. Empty and rinse both tanks, then add holding tank treatment and a small amount of antifreeze to protect the valves. Waste left in the tanks sits for months, and any water trapped around a valve can freeze and crack it. Empty tanks also make the interior far less attractive to pests while the RV is parked.
Remove all food, perishables, and trash, then clean and inspect the interior, including cabinets and storage bays. Seal drafts and gaps around doors, slide-outs, and storage compartments with weather stripping or draft blockers. A cover adds another barrier, and a clean, empty cabin gives rodents and insects fewer reasons to settle in.
Start dewinterizing a few days before travel. Test the water, fuel, and electrical systems at home or at your storage site, restock the RV gradually, and plan a short first trip. That gives you time to catch a small problem before a long drive, and it makes the first real trip of the season far less rushed.
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