Storage Guide
Select your vehicle type below. Print the checklist and check off each item before storing.
Vehicle storage prep is the difference between a smooth spring start-up and a $1,500 repair bill. Insurance companies that specialize in collector and recreational vehicles (Hagerty, Grundy, Progressive RV, Foremost) consistently find that the vehicles that go through proper pre-storage prep file 80% fewer claims than those that do not. The work is straightforward - the costs of skipping it compound silently for months.
Our checklists above cover the six categories where storage prep matters most: boats, RVs, cars, motorcycles, snowmobiles, and jet skis. Each list pulls from manufacturer service manuals, professional storage facility intake protocols, and insurance-claim data on what actually goes wrong with stored vehicles. The line items are ordered by impact - the first 5 items prevent 80% of the most expensive failure modes.
1. Engine block freeze damage. Water expanding in cylinder walls during a hard freeze can crack the block - a $4,000+ repair on most modern engines. Prevention: drain or antifreeze the cooling system before storage in any climate that hits sub-freezing. The checklist's "winterize cooling system" step prevents this.
2. Rodent damage to wiring harnesses. Mice love stored vehicles - warm, dry, hidden. Chewed wiring on a modern vehicle with CAN bus and ECU integration can cost $3,000-8,000 to repair. Prevention: rodent deterrence (peppermint sachets, ultrasonic devices, sealed openings) plus periodic 60-day check-ins. The checklist's "pest deterrence" step prevents this.
3. Tire flat-spotting. Tires sitting on cold concrete for 4+ months develop permanent flat spots that cause vibration and may not roll out. Replacement tires for a high-end RV or collector car cost $1,500-3,000. Prevention: max sidewall pressure, tire saucers or jack stands, periodic 1/4-rotation. The checklist's "tire prep" step covers this.
4. Battery degradation. Batteries left to discharge over winter often will not hold a charge come spring. Premium AGM and lithium batteries cost $200-800 to replace. Prevention: smart battery tender for the entire storage period. Our checklist's "battery tender hookup" step takes 30 seconds and saves a battery cycle.
5. Fuel system varnishing. Untreated gasoline begins to varnish after 30-90 days. Carburetor float bowls and EFI injectors clog. Cleaning costs $400-1,200. Prevention: fuel stabilizer added 2 weeks before storage, run for 5-10 minutes to circulate. Our checklist's "fuel stabilization" step prevents this.
The checklists above support: print-friendly mode (use your browser's print function or Ctrl+P / Cmd+P), local progress saving (your check marks are saved to your browser between visits, so you can prep over multiple sessions), and shareable URLs (link to a specific category by appending #boat, #rv, #car, #motorcycle, #snowmobile, or #jet-ski to the URL). All progress is stored only in your browser - we do not collect or sync this data.
If you store at a StowHelp-listed facility, many of them offer professional storage prep as an add-on service ($150-500 depending on category). Ask the facility about their winterization or storage-prep package - they will run the same checklist using their tools and disposal infrastructure (used antifreeze, fuel residue, oil filters all need proper disposal that home garages often skip).
Boats: Begin prep 3-4 weeks before your area's average first-freeze date. In the Great Lakes that means mid-September. In New England, late September. In Pacific Northwest, mid-October (no freeze risk but rainy season prep). Coastal Florida and Gulf Coast owners with hurricane risk should have hurricane-season-ready prep complete by June 1, then transition to winter prep only if storing in northern climates.
RVs: Start 2-3 weeks before first hard freeze. The water-system winterization is the most time-sensitive step - skip it and a single freeze night cracks pipes, water pump, and water heater. Snowbird RVers leaving the cold north for the Sun Belt should winterize before the trip if any leg of the journey passes through freeze-risk territory at night.
Cars: Start 1 week before storage. Battery tender + fuel stabilizer + tire pressure can all happen the day-of without compromising the prep. Climate-controlled vault storage essentially has no seasonality - prep is the same in February as in July.
Motorcycles: Start 2 weeks before final ride of the season. Run fuel stabilizer through the system on the last ride so the treated fuel reaches the carburetor or EFI. Then complete remaining prep (oil change, battery tender hookup, tire prep, cover) within a week of parking the bike.
Snowmobiles: Inverse seasonality. Begin summer-storage prep mid-April. Fuel stabilization, oil change, ski-edge protection, and rodent prep are the dominant tasks. Most snowmobile damage in storage is fuel varnishing during the 6-month summer layup, not winter freeze.
Jet skis / PWC: Same timing as boats but more aggressive on the engine flush. Saltwater PWC need a full freshwater flush before any winter layup (not just a quick hose-down). Add antifreeze through the cooling system per the manufacturer's procedure. Skipping this is the #1 cause of cracked engine blocks on PWC stored over winter.
DIY prep takes 2-6 hours depending on category, costs $40-150 in supplies (antifreeze, fuel stabilizer, oil + filter, battery tender if you do not already own one, fogging spray, rodent deterrent), and requires basic mechanical comfort. Facility prep takes 0 owner time, costs $150-500, and is done with shop-grade tools and proper waste-disposal infrastructure. The math favors DIY for owners who do their own oil changes already; facility prep wins when you do not have a heated garage to work in, lack the tools, or want documented prep records for warranty / insurance purposes.