The Best Roof Racks for a Subaru Outback

On 2015-2019 and 2020-onward Outbacks the crossbars stow inside the side rails and swing across. It is a clever feature and for a light load it is all you need: a couple of bikes, a bag, a ladder for an afternoon.

For a full cargo box on a long highway trip, most owners are better off with a dedicated bar set, for three reasons that compound:

The spread point is the one that actually blocks purchases. Most full-size cargo boxes want more spread than the factory integrated bars give at their narrowest, and a box mounted on too narrow a spread is not a styling problem — it is a leverage problem. Measure center-to-center and check it against the box’s stated mounting range before you order; the spread guide has the method and the failure modes.

Every figure below comes from the roof rail section of the Subaru owner’s manual for that generation, and every one is a total — bars, carrier and cargo together, not cargo alone.

Two things to take from that table. First, the 2014-2019 cars are the high-water mark, so an upgrade to a newer Outback is a downgrade in roof allowance. Second, the Wilderness is an outlier rated for a roof-top tent — that is what the 700 lb static figure is for, and it does not apply to any other Outback.

A worked example on a 150 lb roof: aero bars and feet, call it 12 lb. A mid-size hard box, 40 lb. That leaves around 98 lb of cargo, which is more than it sounds — a full box of clothes and soft bags rarely passes 70 lb. Where people get into trouble is loading tools, books or water. Our weight limits guide covers the dynamic-versus-static distinction properly.

Every Outback trim has raised side rails. Side rails run front to back; a carrier needs bars running side to side. So the answer to “do I need crossbars if I already have rails?” is yes — unless yours has the integrated swing-out type, in which case you have bars already and the question is whether they are good enough.

Pre-2015 cars have conventional raised rails with separate crossbars, and every major rack system has a rail-mount kit for them. That is the simplest case on the whole site: pick bars, pick the raised-rail foot pack, done.

Set your spread as wide as the rails and the carrier allow. A wider spread is a steadier load and a quieter one, and it is free — the feet slide. The one limit is the box: check its stated minimum and maximum before you lock the feet down. See do I need crossbars if the rails-versus-bars distinction is still fuzzy.

A low roof is the Outback’s real advantage, and it changes what is worth buying. You can reach the middle of the roof standing on the ground, which makes a cargo box genuinely usable rather than a two-person job, and it makes solo kayak loading realistic without a lift assist.

For luggage, a box: enclosed, locked, weatherproof, and the right answer whenever the load is bags. Our cargo box roundup ranks them and the sizing guide stops you buying one the roof cannot take. For boats, the Outback is close to ideal and the kayak carrier picks apply directly.

The honest cost: fuel. Published testing on rooftop carriers finds a double-digit percentage penalty at highway speed, and a wagon that is otherwise efficient feels it more in percentage terms than a truck does. Take the box off between trips — it is five minutes and it is the single highest-value habit in this hobby.