Most jet skis on a single trailer fit in a 10×15 storage unit. Longer models or double-trailer setups require a 10×20 storage unit. The reason the question is less obvious than it seems: most people measure the hull and forget the trailer adds 2 to 4 feet on top of that.
This article gives you the specific dimensions, model comparisons, and storage type guidance you need to book the right unit the first time.
The Short Answer: What Size Unit Does a Jet Ski Need?
A 10×15 unit works for most single personal watercraft on a standard single trailer. A 10×20 unit is the right call for full-size three-passenger models or any double-trailer setup. A 10×10 unit is too short for nearly every jet ski and trailer combination on the market.
| Unit Size | Best For |
| 10×10 | Does not fit most PWC/trailer combos, hull plus trailer tongue exceeds 10 ft |
| 10×15 | Single jet ski on a single trailer; most models under 12 ft combined length |
| 10×20 | Full-size models (13+ ft hull), double trailers, or extra maneuvering room |
Why the Trailer Changes the Math
A jet ski trailer adds 2 to 4 feet to the hull length, and the tongue coupler at the front needs clearance inside the unit door. A 12-foot hull on a standard trailer can easily require 14 to 16 feet of usable depth. Ceiling height matters too. Most drive-up units offer 8 to 10 feet of clearance, which handles a loaded trailer without issue. Confirm the ceiling height with your facility before booking if your personal watercraft sits tall on a specialty trailer.
Jet Ski Dimensions by Model: What Are You Working With?
Jet ski dimensions vary more than most owners expect. A compact Sea-Doo Spark at 9.8 feet and a Kawasaki Ultra 310 at 13.1 feet require very different unit sizes once a trailer is added. Use the table below to match your model to the right storage unit size.
Hull lengths are drawn from manufacturer spec pages at sea-doo.com, yamahamotorsports.com, and kawasaki.com. Trailer brands vary, so measure your specific rig before booking.
| Model | Hull Length | Est. Length with Trailer | Recommended Unit |
| Sea-Doo Spark (2-passenger) | 9.2 ft | 11 to 12 ft | 10×15 |
| Sea-Doo Spark (3-passenger) | 10 ft | 12 to 13 ft | 10×15 |
| Sea-Doo GTX 170 | 12.5 ft | 15 to 16 ft | 10×20 |
| Yamaha WaveRunner EX Series | 10.3 ft | 12.5 to 13.5 ft | 10×15 |
| Yamaha WaveRunner FX Cruiser SVHO | 11.75 ft | 14 to 15 ft | 10×15 or 10×20 |
| Kawasaki STX 160 | 10.34 ft | 12.5 to 13.5 ft | 10×15 |
| Kawasaki Ultra 310 | 13.1 ft | 15 to 17 ft | 10×20 |
The Kawasaki STX 160 sits in a gray zone. At 14 to 15 feet combined, it can technically fit a 10×15 unit, but a 10×20 gives you room to maneuver without scraping walls. If you store accessories alongside the jet ski, go with the 10×20.
Stand-Up vs. Sit-Down Models
Stand-up personal watercraft typically run 7 to 9 feet in hull length. That sounds like a 10×10 might work, but a trailer still pushes the total footprint to 11 or 12 feet in most cases. A 10×15 unit remains the safer choice for stand-up models. They also tend to sit taller on specialty stands, so confirm door height clearance before booking an indoor unit.
Indoor vs. Outdoor Storage: Which Type of Unit Is Right for a Jet Ski?
The right jet ski storage type depends on your climate and how long you plan to store. Here are the three main options and the tradeoffs each one carries.
Outdoor uncovered storage is the lowest-cost option and the easiest to access. It works for short-term storage in mild climates, but leaves your personal watercraft exposed to UV damage, bird droppings, and weather. A fitted watercraft cover helps significantly, but it is not a substitute for a roof.
Drive-up indoor units are the best balance of protection and accessibility for most owners. You pull the trailer in, close the door, and the jet ski is protected from weather and direct sunlight without requiring you to unload it. Confirm that drive-up access is available at your specific facility and that the door opening is wide enough for your trailer. Facilities that specialize in large recreational vehicles, like RecNation’s RV and boat storage, typically offer drive-up units with door openings sized for trailers, making loading considerably easier than a standard self-storage unit. Some facilities also offer covered storage as a middle-ground option between fully enclosed indoor units and open-air parking.
Climate-controlled storage is worth the added cost for owners in frost-prone climates who store longer than 90 days. Repeated freeze-thaw cycles damage fuel systems, rubber seals, and hull materials. If your area appears in USDA Hardiness Zone data as a Zone 6 or colder region, climate-controlled storage is a meaningful investment.
Does a Jet Ski Need Climate-Controlled Storage?
In Sun Belt states like Florida, Texas, and Arizona, a standard indoor storage unit is adequate. Temperatures rarely drop low enough for extended periods to cause freeze damage. In colder climates, or for off-season storage exceeding three months, climate-controlled storage protects the battery, fuel lines, and hull from damage.
It supplements proper winterizing a jet ski, but it does not replace it. Follow your manufacturer’s winterization guide regardless of which storage type you choose.
Single Jet Ski vs. Double Trailer: Does It Change the Unit You Need?
Double trailers are where owners most often get the unit size wrong. They calculate based on one jet ski and book accordingly, then arrive with a rig that does not fit.
A side-by-side double trailer carries two personal watercraft next to each other and typically runs 8 to 8.5 feet wide. A standard 10×20 storage unit is 10 feet wide internally, which may accommodate it, but the door opening is often narrower than the interior. Confirm the exact door width with the facility before booking. Not all 10×20 units fit a wide double trailer through the door.
A tandem (end-to-end) double trailer can run 20 feet or more in total length. That pushes you beyond a standard 10×20 unit and into outdoor open storage or a larger specialty bay. Outdoor storage is generally more practical for double trailers because width clearance constraints in indoor units become a real problem.
Storing Two Jet Skis: Unit Size Options
Your practical options for two personal watercraft are a 10×20 unit for most side-by-side double trailers, two separate 10×15 units if the self-storage facility offers competitive per-unit pricing, or outdoor open storage for tandem setups that exceed standard unit dimensions. Two separate units add cost but eliminate the door-width problem entirely and give you independent access to each jet ski without moving the other.
Other Factors That Affect Which Unit Size to Rent
Once you have identified the right size on paper, these factors can still push you toward the next size up.
- Maneuvering room: A 10×20 unit gives you space to reposition the trailer if you do not pull in perfectly straight. A 10×15 leaves very little margin for error.
- Storing accessories: Life jackets, tow ropes, a watercraft cover, and cleaning supplies take up floor space. If gear goes in the unit with the jet ski, go up a size.
- HOA and zoning restrictions: Many municipalities classify jet skis as recreational vehicles and restrict long-term driveway or yard storage. Check your local ordinances at Municode.com to confirm what your property allows. A commercial self-storage facility may be the only legally compliant option.
- Drive-up door dimensions: Unit width and length are not the only measurement that matters. A roll-up door may be narrower than the interior. Verify door width and height before booking.
- Storage unit rental cost: A 10×20 typically runs $20 to $60 more per month than a 10×15, depending on market and facility type. Check out our breakdown on how much storage costs to benchmark pricing in your area before committing.
What to Measure Before You Book
Bring four measurements when you call or visit a facility:
- Hull length of the personal watercraft (from manufacturer spec sheet or owner’s manual)
- Total trailer length from hitch coupler to rear edge
- Trailer width at the widest point
- Height of the jet ski at its tallest point on the trailer
The door opening width is the most commonly overlooked number. A unit may be 10 feet wide internally, but the roll-up door opening can be a foot or two narrower. Measure before you book, not after you arrive.
Final Thoughts on Choosing the Right Jet Ski Storage Unit Size
If you are ready to book and want a facility built for vehicles this size, RecNation’s jet ski storage facilities offer drive-up and indoor storage options sized for personal watercraft, boats, and trailers at locations across Florida, Texas, Arizona, and beyond. Finding the right unit is easier when the facility already understands what you are storing.
Frequently Asked Questions
Will a Jet Ski Fit in a 10×10 Storage Unit?
In almost all cases, no. A 10×10 unit is 10 feet deep, and even a compact jet ski like the Sea-Doo Spark (9.8 ft hull) will exceed that depth once placed on a standard jet ski trailer, which adds 2 to 4 feet. A 10×15 is the minimum practical storage unit size for a single jet ski on a trailer.
Can You Store a Jet Ski with a Trailer in a Storage Unit?
Yes, and in most cases this is the preferred approach. Unloading the jet ski from the trailer to store it separately is unnecessary and difficult without specialized equipment. You need to account for the full trailer length, not just the hull. Confirm the facility’s door opening width accommodates the trailer before booking.
How Much Does It Cost to Store a Jet Ski in a Storage Unit?
Storage unit rental cost varies by location, unit size, and unit type. A 10×15 drive-up indoor unit typically ranges from $80 to $175 per month depending on the market. A 10×20 unit runs higher, often $120 to $220 per month. Outdoor storage is generally 30 to 50 percent less expensive than an equivalent indoor unit.
What Is the Average Size of a Jet Ski?
Most sit-down personal watercraft range from roughly 10 to 13 feet in hull length. Compact models like the Sea-Doo Spark sit around 9.8 feet, mid-range models like the Yamaha WaveRunner EX Series are approximately 10.8 feet, and full-size three-passenger models like the Kawasaki Ultra 310 reach 13.1 feet. Stand-up models are typically shorter at 7 to 9 feet, but still require trailer clearance that pushes the total stored length to around 12 feet.
Is It Better to Store a Jet Ski Indoors or Outdoors?
Indoor storage offers better protection from UV damage, weather, and theft. It is worth the added cost for owners who store seasonally or live in climates with hard winters. Outdoor storage is adequate for short-term storage in mild climates when the personal watercraft is covered with a fitted watercraft cover. For off-season storage exceeding 90 days in cold climates, indoor or climate-controlled storage significantly reduces the risk of damage to fuel systems, hull materials, and battery components.
