RV Winterization in Washington

Washington winters get cold enough to split an RV’s water lines, and freeze damage is one of the most common and avoidable repairs we see each spring. Poulsbo RV winterizes travel trailers, fifth wheels, and motorhomes so your plumbing survives the cold and is ready to use again next season.

Signs It's Time to Winterize

Winterization is preventive, so the trigger is the calendar and conditions, not a breakdown:

• Overnight temperatures are starting to approach freezing
• You’re done camping for the season
• The RV will sit unused through the cold months
• You’re storing the RV somewhere unheated
• You skipped winterizing last year and want to avoid the risk
• You bought a used RV and don’t know its freeze-protection status

Why Freeze Damage Happens

Water expands when it freezes, and an RV’s water system is full of places water hides: the lines, the water pump, the water heater, the faucets, and the low-point drains. Even a small amount of trapped water can crack a fitting, split a line behind a wall, or destroy the water pump. The damage often isn’t discovered until spring when the system is pressurized and starts leaking, sometimes inside the walls. A single hard freeze on an unwinterized RV can cause hundreds or thousands of dollars in damage.

What Our Winterization Service Includes

• Draining the fresh, gray, and black water tanks
• Draining and bypassing the water heater
• Blowing out the water lines
• Running RV antifreeze through the entire plumbing system
• Protecting faucets, the toilet, and the pump
• Inspecting seals and the exterior for winter readiness
• De-winterization service in spring

Our Winterization Process

1. We drain all tanks and the water heater completely
2. We bypass the water heater so it doesn’t fill with antifreeze
3. We clear the lines, then pump RV antifreeze through every fixture
4. We confirm antifreeze reaches every faucet, the toilet, and drains
5. We do a quick inspection for any seal or exterior issues to address
6. We note what’s needed so spring de-winterization is simple

Why Winterization Can't Be Skipped

Winterization is the cheapest insurance in RV ownership. A freeze-split line behind a wall doesn’t just cost the plumbing repair; it can mean tearing into the structure and dealing with water damage too. The window matters: it only takes one cold night to do the damage, so winterizing before the first hard freeze, rather than after, is what protects the RV. Booking early in the season also avoids the fall rush.

Winter Storage Tips Beyond Winterization

• Store the RV with tanks drained and the system protected
• Use a breathable cover or covered storage to limit moisture
• Place moisture absorbers inside to prevent mildew
• Disconnect or maintain the batteries over winter
• Keep the roof clear of heavy snow and debris
• Schedule spring de-winterization before your first trip

When should I Winterize my RV in Washington?

Before the first hard freeze, typically in fall. It only takes one freezing night to cause damage, so it’s better to winterize early than to gamble on the weather.

Can't I just drain the water instead of using antifreeze?

Draining helps but rarely removes every bit of water from the lines, pump, and low points. RV antifreeze protects the spots that draining and blowing out can miss.

What does Winterization actually protect?

It protects the entire water system: the lines, water pump, water heater, faucets, toilet, and valves, all of which can crack if water freezes inside them.

Do you De-Winterize in the Spring too?

Yes. We flush the antifreeze, sanitize the fresh water system, and check for any issues so the RV is ready to use.

What happens if I forget to Winterize?

A hard freeze can split lines, the pump, and fittings, sometimes inside the walls where it causes water damage too. If you’re unsure whether your RV was protected, have it checked before pressurizing the system.

Ready to Get your RV Winterized?

Schedule your appointment at one of our locations.

Everett

12218 Highway 99 S
Everett, WA 98204
1-888-960-9629

Sumner

2006 136th Ave. E.
Sumner, WA 98390
888-960-8691

Mt. Vernon

510 Eleanor Lane
Mt. Vernon, WA 98273
866-706-1274

Kent

23031 Military RD. S.
Kent, WA 98032
1-888-960-0627

RV Collision

Kent
Everett
Mt. Vernon

Why Choose Poulsbo RV?

With convenient service centers, expert service RV technicians, and a knowledgeable support staff, you’re never alone on the road when you’re part of the Poulsbo RV family.

We serve RV owners throughout the Puget Sound region and beyond — including Seattle, Tacoma, Everett, Bellevue, Kent, Olympia, Sumner, and Mount Vernon.