Can I use a storage unit for my boat, and what size do I need?

Using a standard storage unit for a boat is generally not possible for most vessels. Standard storage units, even the largest sizes (10x30 feet or 10x40 feet), are designed for household goods, vehicles, and equipment with relatively low height clearance. Boats, by design, have significant height even when stored on a trailer, and they require considerable width for the beam and protrusions like outdrives, outboard motors, and bow pulpits. Most storage unit doors are only 8 to 10 feet tall, which will not accommodate a boat on a trailer. Moreover, the interior width is often reduced by the unit's structural supports or neighboring units, making maneuvering a boat inside impractical even without the height issue.

The primary alternative to a standard unit is a dedicated boat storage facility, which offers either indoor heated/cooled storage or outdoor parking. Indoor boat storage facilities are custom-built with oversized doors (typically 12 to 16 feet high or more) and wide, unobstructed bays designed to accommodate boats of various lengths and beam widths. These facilities also provide specialized services such as winterization, shrink-wrapping, and maintenance access. Outdoor storage, whether on a trailer or in a dry stack rack, is a more common and cost-effective choice for open-air storage, though it offers less protection from the elements.

What size storage do I need?

To determine the size you need, you must measure your boat's overall length and beam while it is on the trailer. Boat manufacturers list "length overall" (LOA), which includes bow sprits, swim platforms, and any protruding hardware. However, for storage purposes, you need the trailer length, which typically adds 2 to 4 feet beyond the boat's LOA because of the tongue and winch post. Also measure the beam (width) of the boat at its widest point, including any rub rails, and the height from the ground to the tallest point of the boat (usually the windshield, radar arch, or motor cowling when tilted).

Standard storage options by boat length

Under 16 feet (e.g., small jon boats, dinghies, or kayaks): Some standard storage units with high ceilings (e.g., 10x20 or 10x30 with 10-foot doors) may work, but height remains the primary obstacle. Dedicated boat storage for vessels this size is often offered at dry stack facilities or in covered lockers.
16 to 24 feet (e.g., ski boats, small center consoles, runabouts): These vessels typically require a dedicated boat storage space of at least 12 feet wide by 25 to 30 feet long, with door heights of 12 feet or more. Most indoor boat storage facilities offer standard-sized compartments in this range. Outdoor parking on a trailer is also common, requiring a space about 10 feet wide and 30 feet long.
24 to 30 feet (e.g., cabin cruisers, larger walkarounds, dual consoles): A compartment measuring 14 feet wide by 35 to 40 feet long with a 14-foot door is typical for indoor storage. Outdoor trailer storage requires a space at least 12 feet wide and 35 to 40 feet long. Many facilities require you to store these boats on a trailer or on a cradle in a dry stack.
30 feet and above (e.g., express cruisers, sportfishermen): Indoor storage for vessels this size is very rare and extremely expensive. Most owners of boats 30+ feet use wet slips (marina slips) or outdoor dry rack storage. If indoor storage is needed, you must contact specialized facilities that can accommodate beams often exceeding 12 feet and heights up to 16 feet.

Important considerations before renting

Accessibility: Confirm the facility can accommodate a vehicle towing a boat (e.g., turning radius at the entrance, aisle width inside). Standard storage unit facilities often have narrow driveways and tight corners that are unsuitable for a trailer.
Security: Dedicated boat storage facilities typically have gated access, surveillance cameras, and on-site management. Standard storage units may have lower security, increasing theft or vandalism risk for an expensive boat.
Insurance: Your boat insurance policy may have specific storage requirements (e.g., indoor storage in a locked, designated facility) to maintain coverage. Verify with your insurer that the storage arrangement you choose meets their terms. Some facilities require you to show proof of insurance.
Climate control: Indoor boat storage often includes climate-controlled environments that protect against humidity, mold, and temperature extremes. Standard storage units are rarely climate controlled, which can lead to damage to upholstery, electronics, and engines if the boat is not properly winterized.
Maintenance services: Many boat storage facilities offer winterization, engine flushing, battery maintenance, and shrink-wrapping. If you need these services, ensure your chosen facility provides them or allows your service provider access.

Final recommendation: If you are considering storage for a boat, skip the standard storage unit and instead research dedicated boat storage facilities. They are designed for your vessel's specific size and weight, and they offer the security and services that protect your investment. Measure your boat on the trailer and contact local facilities directly to confirm they can accommodate your dimensions.