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Published May 15, 2020 | Last updated September 1, 2026
If your RV is going to sit in freezing weather with water still in the plumbing system, then yes, you need to protect it.
I learned that lesson the hard way.
When Susan and I bought our 2008 Gulf Stream Conquest Class C from a private owner, the previous owner had not winterized it. We found out on our shakedown trip when water started pouring out from under the dinette.
The water pump had cracked from freeze damage.
After that, I stopped treating winterization like an optional fall chore. Every winter our RV stayed in Maryland, I winterized the plumbing with RV antifreeze.
We still follow the same basic rule with our current Class A. If it is staying in Maryland for the winter, I winterize it. If it is in Florida where we are not expecting freezing temperatures, I do not winterize it just because the calendar says winter.
That is really the answer to this whole question: winterize based on the freeze risk to the RV, not the month on the calendar.
Do You Have to Winterize an RV?
You need to winterize an RV if the plumbing system contains water and the RV may be exposed to freezing temperatures long enough for that water to freeze.
Water expands when it freezes. In an RV, that can damage water lines, fittings, faucets, toilet valves, water pumps, filter housings, water heaters, and other plumbing components.
Some of those parts only hold a small amount of water, but that is enough to cause an expensive problem if the water freezes in the wrong place.
Our cracked water pump is a perfect example. The entire RV did not need to turn into an ice cube. Water simply remained inside a component that could not handle the expansion when it froze.
Does It Have to Be Below 32°F for a Full Day?
No. There is no magic rule that says your RV is safe until it has been below 32°F for 24 hours.
At the same time, a brief dip to 31°F does not mean every pipe in every RV instantly freezes.
How quickly something freezes depends on the actual temperature, how long it stays cold, wind, whether the plumbing is exposed, whether the underbelly is enclosed and heated, and whether heat is being maintained inside the RV.
My approach is simple: if the RV is going into storage and freezing weather is coming, I do not try to guess how many hours I can get away with. I winterize it before the cold arrives.
If you want a deeper explanation of freeze timing, we have a separate article on how cold it has to get before RV pipes and tanks can freeze.
Do You Need to Winterize an RV in Florida?
Not necessarily.
We do not winterize our Class A when it is staying in Florida and freezing weather is not expected.
That does not mean every RV in Florida is automatically safe. North Florida can get freezing weather, and unusual cold snaps happen.
The point is that winterization should be based on the conditions where your RV is actually stored.
If you live somewhere that rarely freezes, watch the forecast. If a hard freeze is coming, protect the plumbing before it gets there.
Do You Have to Winterize a Four-Season RV?
A four-season label does not automatically mean you can park the RV in freezing weather, turn everything off, and walk away.
Many four-season RVs have enclosed underbellies, added insulation, heated holding tanks, or furnace ducts that help protect plumbing while the RV is being heated and used.
But if the RV is stored with the furnace off, those systems may not provide the same protection.
I would always check the owner’s manual for the exact RV instead of assuming the words “four season” eliminate the need to winterize.
What if the RV Is Plugged In All Winter?
Being plugged into shore power does not automatically protect the plumbing.
You could choose to keep the RV heated instead of winterizing it, but now you are relying on the heating system, propane supply if the furnace uses propane, electrical service, thermostats, and every other part of that protection plan to keep working.
A power outage or furnace problem during a cold spell can turn that plan into an expensive mistake.
If I am storing an RV in Maryland and I am not actively using it, I would much rather winterize the plumbing than depend on the heater all winter.
We also have a separate article on whether you should leave your RV plugged in all winter.
Can You Still Use an RV After It Is Winterized?
Yes, but you have to change how you use the plumbing.
If you have RV antifreeze in the fresh-water lines, you cannot simply fill the fresh tank and use the plumbing normally without de-winterizing the system first.
Some winter campers leave the plumbing winterized and carry bottled water, use campground bathrooms, or use other workarounds rather than putting the whole water system back into service.
Other RVers actively use the plumbing in freezing weather and rely on heated underbellies, tank heaters, heated water hoses, skirting, and the furnace to keep everything protected.
That is a different situation from storing an RV unused through the winter.
What Happens if You Do Not Winterize an RV?
You may get lucky.
Or you may find out the way we did.
A small amount of trapped water can freeze and crack a component. The damage might stay hidden until spring when you fill the system again and suddenly have water pouring into a cabinet, wall, floor, or storage compartment.
The repair itself can be annoying, but hidden water damage can be even worse if you do not notice the leak immediately.
Winterizing is cheap compared with chasing freeze damage through an RV plumbing system.
I Use RV Antifreeze to Winterize Our RV
There are two common approaches RV owners use to protect the freshwater plumbing: blowing the lines out with compressed air or pumping RV antifreeze through the system.
I use RV antifreeze.
After what happened with our Class C, I like knowing the plumbing lines and vulnerable components have RV antifreeze in them rather than hoping I managed to blow every pocket of water out of the system.
Use only RV/marine antifreeze designed for potable-water plumbing systems. Do not use automotive engine antifreeze in your RV freshwater system.
You can find the type of non-toxic RV antifreeze I am talking about here.
Winterizing Is More Than Pouring Antifreeze Into the RV
This is where beginners can get into trouble.
You need to protect every part of the water system that can hold water. Depending on the RV, that can include the pump, faucets, toilet valve, outside shower, low-point drains, filter housings, water heater, P-traps, ice maker, washing machine, and other appliances connected to the water system.
Water heaters are especially important because many need to be drained and bypassed before pumping antifreeze through the plumbing. Tankless water heaters can have their own procedures, so do not assume the steps for a traditional tank-style heater apply to yours.
We have a separate guide on how to winterize a tankless RV water heater.
The owner’s manual for your RV and each water-connected appliance should be the final authority for your exact setup.
Can You Winterize an RV Yourself?
Yes. Once you understand your RV’s plumbing layout, winterizing is very doable for many owners.
But the first time is when I would slow down and make sure I really understand the process.
You do not want to save a few dollars doing it yourself and then miss one valve, appliance, filter housing, or water line that freezes later.
If you are the kind of person who would rather watch someone walk through the entire process, I have personally used the RV Education 101 training programs and think they are very beginner-friendly. Their Winterizing and Storing Your RV video course is a good option if you want more step-by-step instruction before doing it yourself.
How Much Does It Cost to Have an RV Winterized?
Professional winterization prices vary a lot by RV type, location, and how complicated the plumbing system is.
A simple travel trailer with one bathroom is a different job from a large motorhome with multiple bathrooms, an ice maker, washing machine, dishwasher, and hydronic heating system.
Rather than relying on an old nationwide price estimate, I would call a couple of local RV service centers or mobile RV technicians and ask exactly what their winterization service includes.
Also ask whether de-winterization is included later or charged separately.
If you are paying someone else, schedule early. Everybody in a cold-weather area seems to remember winterization at about the same time.
Do You Need to Remove the RV Batteries for Winter?
Battery storage is important, but I consider it a separate winter-storage issue from plumbing winterization.
The correct approach depends on whether you have flooded lead-acid, AGM, or lithium batteries, whether the RV remains connected to a properly managed charger, and what the battery manufacturer recommends for storage and low-temperature charging.
I would follow the battery manufacturer’s instructions instead of using a blanket rule that every RV battery should either stay installed or always be removed.
My Bottom Line
Do you have to winterize an RV?
If it is going into storage where freezing weather is a real possibility and there is water in the plumbing, my answer is yes.
I have already paid for the lesson once with a cracked water pump. I am not interested in learning it again.
When our RV stays in Maryland, I winterize it with RV antifreeze. When it stays in Florida and freezing weather is not expected, I do not winterize it just because it happens to be December or January.
Watch the weather, understand your RV’s plumbing, follow the manufacturer’s procedures, and protect the system before a freeze catches you by surprise.
Related Reading
How Cold Does It Have to Get Before RV Pipes and Tanks Freeze?
10 Steps to Properly Store Your RV for Winter Without Doing Damage
Should I Leave My RV Plugged In All Winter?
How to Winterize a Tankless RV Water Heater
Mike Scarpignato – Bio
Mike Scarpignato founded RVBlogger.com with his wife, Susan, in 2018 to help new and experienced RVers make better decisions about buying, owning, and traveling in an RV.
Mike has decades of camping experience and has traveled extensively in both a Gulf Stream Conquest Class C and a Thor Challenger Class A motorhome. He and Susan spend much of the year on the road, attend RV shows, visit dealerships, and tour RVs across the country.
Through RVBlogger.com and the RVBlogger YouTube channel, Mike shares practical, first-hand advice about RV buying, floor plans, ownership, maintenance, gear, campgrounds, and the RV lifestyle.
We slept in our camper several times over the summer, but never used any water in the lines. We were at a relatives home so we used their restrooms & they cooked. Do we still need to winterize even though no water is in any lines since last years winterization?
What’s with an arctic package. Are they good enough to use without winterizing?
We use our motorhome off and on year round. Typically before we got this one we winterized and just used bottled water when winter camping but would like not to have to do that all the time. We live in Arkansas where it’s not freezing all the time.
Ok, to CONFIRM, winterize the RV if you’re going to be storing it over the winter months.
BUT, if you LIVE in it full time, this is NOT necessary, RIGHT???
Thanx!
Cliff
Texas
I just bought my RV new do I still need to winterize it. It’s never been used
Hi Zola,
Yes, you still have to winterize your RV unless it was already winterized by the dealership.
Mike