PickRV Mega Guide
Towable winterization complete — antifreeze, skirting, heat tape, battery storage
Step-by-step winterization for travel trailers + fifth-wheels. Anti-freeze choice, skirting, heat tape, battery storage, dewinterization…
Winterizing a towable trailer (travel trailer, fifth-wheel) for cold storage is the difference between a spring-ready rig + a $3,000-8,000 freeze-damage repair. Burst water pipes, cracked tanks, dead batteries, frozen seals — all preventable with 2-3 hours of proper winterization. Below is the complete playbook with verified product recommendations + step-by-step procedures sourced from RVIA + manufacturer winterization standards.
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What does the PickRV towable winterization complete guide guide cover?
Step-by-step winterization for travel trailers + fifth-wheels. Anti-freeze choice, skirting, heat tape, battery storage, dewinterization checklist. We walk through it section by section — what to check, what it costs, and the details most listings leave out.
- Why winterize (the cost of NOT)
- Water system winterization (the most critical step)
- Battery storage (the second-most-critical step)
- Skirting + heat tape (winter parking outdoors)
- Exterior protection (the often-skipped steps)
- Dewinterization (the spring procedure)
- Winterization FAQ
Section 01 · overview
Why winterize (the cost of NOT)
Per RVIA + insurance industry data, freeze-damage repairs to RVs typically cost $3,000-8,000. Burst water pipes, cracked fresh-water tanks, broken hot-water heater tanks all preventable with proper winterization.
PickRV editor · what manufacturers + manuals gloss over
What 'forgot to winterize' costs in real money: cracked fresh-water tank $1,500-3,000. Burst plumbing line $500-1,500. Cracked hot-water heater tank $800-1,500. Frozen + cracked toilet $400-800. Total cascade damage: $3,000-8,000. Insurance covers some, but personal policies often exclude freeze damage if winterization wasn't performed (per most RV insurance policy terms).
- Cracked fresh-water tank: $1,500-3,000 repair
- Burst plumbing line: $500-1,500
- Cracked hot-water heater: $800-1,500
- Total cascade damage: $3,000-8,000
- Insurance may exclude freeze damage if not winterized
Section 02 · how to
Water system winterization (the most critical step)
Step-by-step water system winterization. Required: ~2-4 gallons RV antifreeze (the pink, non-toxic kind — NOT automotive ethylene glycol), water heater bypass valve set (if not factory-installed), tank wand or air compressor + blow-out attachment.
- 1
Drain fresh-water tank + lines
Open all drain valves (fresh tank, hot/cold lines, low-point drains). Run all faucets until water stops. Let drain 30+ min.
- 2
Bypass + drain hot-water heater
Locate hot-water heater bypass valves (usually 3 valves near heater). Turn to BYPASS position. Drain heater via lower drain valve. Verify ~6-10 gallons drain out.
- 3
Blow out water lines with compressed air
Connect air compressor (40-50 PSI) to city water inlet via blow-out plug. Open each faucet one at a time until only air comes out. Removes residual water from lines.
- 4
Add antifreeze to water lines via water pump
Connect a hose from water pump inlet to RV antifreeze jug. Disconnect water pump from fresh tank. Turn ON water pump. Open each faucet one at a time (hot AND cold) until pink antifreeze flows out. Close faucet. Repeat for each fixture.
- 5
Pour antifreeze in P-traps + toilet
Pour 1-2 cups antifreeze in each sink drain (P-trap), shower drain, toilet bowl. Flush toilet to pull antifreeze into tank.
- 6
Pour antifreeze in black + gray tanks
Pour 1-2 cups in toilet (drains to black tank). Pour 1-2 cups in each sink drain (drains to gray tank). Prevents freeze damage to tank seals + valves.
PickRV editor
What winterization YouTubers often skip: the order matters. Drain BEFORE blowing out with air (residual water mixes with antifreeze, dilutes effectiveness). Bypass hot-water heater BEFORE adding antifreeze (don't waste 6-10 gallons of antifreeze filling the heater). Always use RV antifreeze (pink, non-toxic propylene glycol) — NEVER automotive ethylene glycol (toxic, won't drain safely in spring).
Section 03 · how to
Battery storage (the second-most-critical step)
RV house batteries (lead-acid or lithium) lose capacity in cold + need specific storage procedures. Required: trickle charger or solar maintainer, multimeter, ventilated indoor storage location.
- 1
Disconnect batteries from RV
Disconnect negative terminal first, then positive. Remove batteries from rig (heavier than they look — get help).
- 2
Clean terminals
Brush + baking soda + water solution. Wipe dry. Apply terminal grease or petroleum jelly to prevent corrosion.
- 3
Charge to full state
Charge to 100% state of charge before storage. Use trickle charger (Battery Tender Plus, $40) or solar maintainer ($30).
- 4
Store indoor + temperature-controlled
Ideal: 50-70°F garage or basement. Below 32°F = capacity loss accelerates. Above 80°F = self-discharge accelerates. Indoor garage with mild winter heating works.
- 5
Maintain charge during storage
Trickle charger or solar maintainer keeps batteries at ~100% during 4-6 month storage. Without maintenance, lead-acid loses 50-70% capacity over winter; lithium loses 5-10% (much better).
- 6
Test before reinstall in spring
Multimeter test (12.6V+ for lead-acid healthy). Load test if available. Replace if voltage <11.5V or load test fails.
Up next
Skirting + heat tape (winter parking outdoors)
Section 04 · overview
Skirting + heat tape (winter parking outdoors)
If you must leave the rig outdoors over winter (no indoor storage), additional protection needed.
PickRV editor
What outdoor-winter-storage requires beyond standard winterization: (1) RV skirting ($300-1,500, custom or DIY foam-board) — blocks wind under rig, keeps undercarriage warmer. (2) Heat tape on water lines ($30-80 per heat-tape strip) — prevents freeze if hookups remain connected. (3) Tank heaters ($80-150 per tank) — prevents tank freeze if rig actively used in winter. (4) Antifreeze topping of P-traps + toilet every 4-6 weeks (antifreeze evaporates).
- RV skirting: $300-1,500 (blocks wind, warms undercarriage)
- Heat tape: $30-80/strip (prevents water-line freeze if hookups connected)
- Tank heaters: $80-150/tank (for active winter use)
- Antifreeze topping: every 4-6 weeks (evaporation)
Section 05 · overview
Exterior protection (the often-skipped steps)
Beyond water system + batteries, exterior protection prevents 80% of avoidable winter damage.
PickRV editor
What exterior winterization saves: (1) Cover all exterior vents + intake fans with vent covers ($5-15/vent) — prevents rodent entry + moisture. (2) Inspect + replace cracked roof sealant (Dicor Lap Sealant $15/tube) — prevents winter ice-dam damage. (3) Inspect + lubricate slide-out seals (rubber gasket conditioner) — prevents seal cracking in cold. (4) Cover tires + awning OR retract awning fully + cover with weatherproof tarp. Total cost: $50-150. Avoided damage: $2,000-5,000 in spring repairs.
- Cover all vents + intake fans ($5-15/vent each)
- Inspect + replace roof sealant (Dicor Lap Sealant)
- Lubricate slide-out seals (rubber gasket conditioner)
- Cover tires + awning (or retract awning fully)
- Total cost: $50-150 vs $2,000-5,000 avoided repairs
Section 06 · how to
Dewinterization (the spring procedure)
Spring dewinterization is winterization in reverse. Required: clean water source, ~30-60 min.
- 1
Reverse water heater bypass + reconnect water pump to fresh tank
Set bypass valves to NORMAL operation. Reconnect water pump inlet to fresh tank.
- 2
Fill fresh tank with clean water + add 1 cup bleach
Fill fresh tank ~50% with water + 1 cup bleach for sanitization. Run water pump.
- 3
Flush all lines until clean water (no pink antifreeze)
Open each faucet one at a time. Flush until clean clear water (no pink). Allow ~5 min per faucet.
- 4
Drain bleach solution + flush twice more with clean water
Drain entire fresh tank. Refill with clean water. Flush all lines. Repeat to ensure all bleach + antifreeze removed.
- 5
Reinstall + reconnect batteries
Connect positive terminal first, then negative. Test 12V systems work.
- 6
Inspect for damage before first use
Check water system for leaks. Check appliances. Check tire condition. Check awnings + slides for any winter damage.
Up next
Winterization FAQ
Section 07 · faq
Winterization FAQ
Common questions about RV winterization.
Can I winterize my own RV?
Yes. Most RV winterization is DIY. Takes 2-4 hours first time, 1-2 hours subsequent. Cost: $40-80 for antifreeze + supplies. Professional winterization: $150-300.
Do I need to winterize if I store the RV in a heated garage?
Generally no for water system (if garage stays above 40°F). Still recommended for batteries (cold reduces life) + tires (lift off ground to prevent flat spots).
What's the difference between RV antifreeze and automotive antifreeze?
RV antifreeze: pink, non-toxic propylene glycol. Safe to leave in plumbing + safe to drain into ground. Automotive: green/yellow, toxic ethylene glycol. NEVER use in RV — toxic + won't drain safely in spring.
Should I leave water in the hot-water heater during winter storage?
NO. Drain hot-water heater + bypass it with valves. Heating a frozen tank cracks the steel. Bypass valves are usually factory-installed near the heater.
PickRV editor
What this guide gives RVers: the complete winterization framework. Most online winterization guides cover water system but skip batteries, exterior, and skirting — yet those account for 50% of winter damage. Total time: 2-4 hours. Total cost: $40-80 (DIY) vs $150-300 (professional). Saved spring repair cost: $2,000-8,000.
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