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How to Winterize Your RV in Ontario: A Step-by-Step Guide
Knowing how to winterize an RV in Ontario is one of the most important things you can do to protect your investment, because freeze damage is not covered by most RV insurance policies, and it is entirely preventable.
In Oxford County and across southwestern Ontario, temperatures regularly fall well below freezing by November. An RV that goes into storage without proper winterization is an RV that comes out in spring with cracked water lines, damaged pumps, and failed fittings, repairs that routinely cost thousands of dollars and delay the start of camping season.
This guide covers the complete DIY winterization process for travel trailers, fifth wheels, and toy haulers in Ontario, the specific considerations that apply to our climate, and the mistakes that send RV owners to the service department every spring.
Not a DIY project? Our certified RV technicians in Woodstock handle full winterization and spring commissioning.
Book RV Winterization ServiceDIY Winterization vs. Bringing It to a Certified Dealer
Most RV owners with some mechanical confidence can complete a basic winterization themselves. The key is following a complete checklist and not skipping steps, because it is usually the one missed step that causes the expensive spring repair.
Here is where the line between DIY and professional service typically falls:
| DIY-Friendly | Better Left to a Certified Tech |
|---|---|
| Draining fresh, grey, and black water tanks | Full water system blow-out with compressed air, requires proper technique and equipment |
| Adding RV antifreeze to traps and fixtures | Diagnosing and repairing existing water line damage before storage |
| Disconnecting and removing the battery | Roof and seal inspection and resealing, wrong sealant type causes more damage |
| Cleaning and drying the interior | Propane system pressure test and appliance check |
| Covering tires and exterior vents | Electrical system inspection and winterization of any water-cooled components |
| Shutting off propane and protecting appliances | Slide-out seal inspection and lubrication under load |
When to Skip the DIY
If your RV has a low-point drain system and you're confident in the process, DIY winterization is reasonable for most travel trailer owners. If you have a complex fifth wheel with multiple slide-outs, a heated water tank, or any system you haven't personally winterized before, a certified technician is the safer choice. The cost of a professional winterization is a fraction of what a single cracked fitting or damaged pump costs to repair in spring.
Printable RV Winterization Checklist: Ontario
Work through this checklist in order. Each step builds on the last, skipping ahead can leave water trapped in sections you have already sealed.
| Step | Task | Why It Matters |
|---|---|---|
| 1 | Use all water in the fresh tank, then turn off the water pump | Never winterize with water remaining in the system; it will freeze and expand |
| 2 | Open all faucets (hot and cold) and flush the toilet to relieve pressure | Pressure remaining in lines can push antifreeze away from where it needs to be |
| 3 | Drain the fresh water tank completely via the low-point drain(s) | Most travel trailers and fifth wheels have one or two low-point drains; consult your owner's manual |
| 4 | Drain and flush the grey and black water tanks; add a small amount of RV antifreeze to the black tank | Black tank valves can freeze solid if water remains; RV antifreeze in the bowl prevents this |
| 5 | Drain the hot water heater, turn off propane or electric, release pressure, and open the drain plug | Never winterize with water in the hot water tank; it will crack the tank or damage the element |
| 6 | Bypass the hot water heater using the winterization bypass valve (if equipped) | Without bypass, you will use 6 to 10 litres of antifreeze just to fill the tank; bypassing it saves product |
| 7 | Connect a hand pump or winterization kit to the water line and pump RV antifreeze through every fixture | Work one fixture at a time: open the cold tap until pink, then the hot tap until pink, then move to the next |
| 8 | Flush the toilet until pink antifreeze appears in the bowl and tank | Do not skip this step; the toilet seal is a common freeze point |
| 9 | Pour one cup of RV antifreeze directly into each drain, sink, shower, and floor drains | P-traps hold water; antifreeze in the trap prevents freeze damage at every drain |
| 10 | Disconnect the battery and store it in a warm, dry location | Batteries lose up to 35% of their capacity when stored fully discharged in cold temperatures |
| 11 | Turn off all propane appliances and close the main propane valve | Do not leave propane lines pressurized in storage; have the system inspected in spring before use |
| 12 | Inspect the roof seals, window seals, and slide-out seals; reseal any gaps found | Water entry through failed seals during winter storage is the most common cause of RV damage in Ontario |
| 13 | Clean and dry the interior completely; remove all food, medications, and liquids | Moisture in the interior promotes mould; leave interior cabinet doors open during storage |
| 14 | Cover the roof vents and exterior vents to prevent animal entry | Mice enter through openings as small as a quarter; steel wool and vent covers are effective deterrents |
| 15 | Remove or cover tires; lower the tongue jack to take weight off the tires | UV and ozone exposure cracking is accelerated in storage; tire covers extend tire life significantly |
Ontario-Specific RV Winterization Considerations
Winterizing an RV in Ontario is not the same as winterizing in British Columbia or the southern United States. Our climate creates specific risks that general guides often fail to address.
Temperature Thresholds
In Oxford County and surrounding southwestern Ontario, temperatures can drop to -15°C or colder by January. RV water lines freeze at 0°C if there is any water remaining in the system, which means the deadline for proper winterization is well before that. Our technicians recommend having your RV fully winterized before temperatures regularly reach 5°C overnight, which typically means completing the process by mid-October at the latest.
Ontario Timing Guide
- September: Book your service appointment; slots fill quickly in October
- Early October: Ideal window to complete winterization, before overnight lows approach 5°C
- Mid-October: Last reliable window; risk of overnight freeze increases rapidly after this
- November onward: High risk; do not store an un-winterized RV in Ontario past this point
RV Storage in Ontario: What You Need to Know
Where you store your RV over winter matters as much as how you winterize it. Here are the key storage considerations for Ontario owners:
| Storage Type | Considerations for Ontario Owners |
|---|---|
| Indoor heated storage | Best option, eliminates freeze risk entirely. More expensive but reduces wear on exterior, seals, and tires. |
| Indoor unheated storage | Still protects from UV and precipitation. Temperature fluctuations can still occur; full winterization still required. |
| Outdoor on your property | Most economical. Full winterization is critical. Use a quality, breathable cover, not a tarp, which traps moisture. |
| Outdoor storage facility | Level ground and security vary by facility. Confirm whether the facility clears snow from around units. |
| Dealer or service facility storage | Some dealers offer secure storage; ask about what is included and whether winterization is part of the service. |
Insurance Considerations
Most RV insurance policies in Ontario exclude damage caused by freezing if the RV was not properly winterized. Before storing your unit, review your policy or contact your insurer directly to confirm whether freeze damage is covered and whether a professional winterization receipt is required to support a claim. Keeping service records is good practice regardless of what your policy says.
Keep a copy of your winterization checklist or service receipt with your RV insurance documents. If you ever need to make a spring repair claim, documented winterization is the difference between a covered claim and an out-of-pocket repair.
Common RV Winterization Mistakes: Do This, Not That
Our service department sees the same preventable damage every spring. Here are the most common winterization mistakes Ontario RV owners make, and exactly what to do instead:
| Do This | Not That |
|---|---|
| Use RV-specific antifreeze rated for -50°C | Use automotive antifreeze, it is toxic and will contaminate your water system |
| Bypass the hot water heater before pumping antifreeze | Skip the bypass, you will waste 6 to 10 litres filling a tank that doesn't need it |
| Pour antifreeze directly into every drain trap | Assume draining the tanks is enough, traps hold water and freeze independently |
| Remove the battery and store it in a heated space | Leave the battery in the RV, it will discharge in the cold and may not recover |
| Inspect and reseal the roof and slide-out seals before storage | Skip the seal inspection, winter moisture entry causes thousands in damage |
| Use a breathable RV cover designed for your unit size | Cover with a standard tarp, tarps trap moisture underneath and accelerate mould and seal deterioration |
| Store with cabinet doors open to allow air circulation | Close everything tight, humidity becomes mould during a sealed Ontario winter |
| Book your service in September for an October appointment | Wait until November, service schedules are full and frost won't wait |
The single most costly winterization mistake we see in our service department every spring is owners who drained the tanks but forgot to bypass the hot water heater, then pumped antifreeze in without bypassing. The result: the antifreeze went into the water heater tank, which then wasn't fully drained either, and the water heater cracked over winter. Between the hot water heater replacement and associated plumbing work, that one skipped step typically costs $800 to $2,000 in spring repairs.
Not confident about any of these steps? Our RV service team in Woodstock handles full winterization for all makes and models, including Keystone travel trailers, fifth wheels, and toy haulers. No obligation to be a customer to book a service appointment.
Thinking about upgrading before next season? Browse our RV inventory or talk to our finance team about trade-in options; trading in before winter often means better availability on the models you want in spring.
Book Your RV Winterization in Woodstock
Certified RV technicians · All makes and models · Woodstock, Ontario
Frequently Asked Questions: RV Winterization in Ontario
In Oxford County and southwestern Ontario, the ideal window is early to mid-October, before overnight temperatures regularly drop below 5°C. Water lines can freeze at 0°C, and the risk increases rapidly once overnight lows start touching the freeze threshold. Booking your service appointment in September is the best way to guarantee you get your preferred October slot.
Use RV-specific non-toxic antifreeze rated for at least -40°C or -50°C for Ontario winters. Pink RV antifreeze is safe for potable water systems and is the correct product for winterizing your water lines, traps, and tanks. Never use automotive antifreeze; it is toxic, will contaminate your water system, and is extremely difficult to fully flush out in spring.
The process is largely the same: drain the tanks, bypass the water heater, pump antifreeze through all fixtures and drains, and remove the battery. Fifth wheels and toy haulers often have more slide-outs and more complex water systems with additional low-point drains. If you have not winterized your specific unit before, consult the owner's manual or have a certified technician walk you through it the first time.
Yes, but it requires proper winterization and a good quality breathable cover, not a tarp. Outdoor storage exposes your RV to UV damage, freeze-thaw cycles, and potential animal entry. If storing on your property, make sure the ground is level and the unit is stable. A quality RV cover, proper tire protection, and covered vents are essential for outdoor winter storage in Ontario.
The cost of professional RV winterization varies depending on the size of the unit, the number of slide-outs, and whether any additional repairs or inspections are included in the appointment. Our team is happy to provide a quote based on your specific RV; contact our service desk or book online to get started.
Water left in lines, fittings, tanks, or the hot water heater will freeze and expand, cracking pipes, splitting fittings, and potentially damaging the water pump. Repairs typically range from a few hundred dollars for a single fitting to several thousand for a cracked water heater or extensive line damage. Most RV insurance policies in Ontario do not cover freeze damage if the unit was not properly winterized, which makes it a fully out-of-pocket expense.
The Power Garage RV Service Team
Certified RV Technicians, Woodstock, Ontario
Our RV service department has winterized and spring-commissioned travel trailers, fifth wheels, and toy haulers across Oxford County since 2007, including Keystone RVs and all major manufacturers.
The Power Garage · 99 Montclair Drive, Woodstock, ON N4V 1C5 · 519-533-1300 · thepowergarage.ca
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