The stretch of I-80 from Auburn up to the lake is entirely paved, which is easy to lose sight of once you've talked yourself into knobby tires for a Tahoe summer trip. The highway runs paved from Auburn to Truckee, then paved again into the basin. But what you do after you pull off the interstate is where the tire decision actually lives, whether that's a sandy campground spur in Tahoe National Forest, a fire road into the granite above Donner Summit, or a trailhead parking area that hasn't been graded since last October. That's the gap the all-season-versus-all-terrain debate has to account for.

The Outback is a natural anchor for this question, so it carries a lot of what follows. But the same logic applies across every AWD Subaru on our lot.

What Actually Decides the All-Season vs. All-Terrain Choice?

What decides this is less the tire itself than the last five miles of your route, and it genuinely cuts both ways, because an all-season owns the paved I-80 climb while an all-terrain earns its keep only once you leave the off-ramp for loose dirt and unmaintained forest surface. Start with the route itself. I-80 from Auburn to Truckee climbs from roughly 1,200 feet of elevation at Auburn to about 7,000 feet at Donner Summit, and every inch of it is paved four-lane interstate. In summer, Caltrans lifts chain control restrictions on I-80 entirely through the Sierra Nevada corridor. The road surface is dry, hot pavement until you reach the Truckee basin.

The off-ramp is the decision point.

A family that hits Tahoe six summer weekends and stays on paved campground loops each time isn't shopping for all-terrain tires. A solo hiker who stages on dirt fire roads above Granite Flat Campground and logs real miles on unmaintained surfaces is. Be straight with yourself.

Subaru Symmetrical AWD Has a Tire Rule You Can't Ignore

Yes, you can run either all-season or all-terrain on a Subaru, but only as a matched set of four, because Symmetrical AWD holds tighter tolerances than almost any other drivetrain and the owner's manual makes the requirement explicit. Subaru's owner's manual states that all four tires must be the same brand, design, size, and tread depth, with circumferences within one quarter inch of each other and tread depths within approximately 2/32 inch across all four corners.

The Forester, the Crosstrek, the Outback, the Ascent, the Legacy, every Subaru we carry runs Symmetrical AWD, and it's a full-time, always-on system. The setup never waits for a slick patch to kick in. It drives all four wheels the entire time you're moving. When tires are mismatched in circumference, it has to compensate constantly rather than only in cornering or slip events. The center differential works against that resistance every mile, and that kind of sustained stress accelerates wear on components that are genuinely expensive to sort.

• If your current all-seasons have moderate remaining tread and you want to switch to all-terrain, budget for a full set of four.
• If only one tire is damaged and the other three are nearly new, replacing with an identical tire (same brand, model, size) is acceptable within Subaru's spec.
• Never mix all-season and all-terrain tires in the same set on a Symmetrical AWD vehicle.
• Bring the Subaru in and have our service team measure all four tread depths before you commit to replacing less than a full set.

Schedule a service visit and we'll measure all four corners first. Then you decide.

Schedule a Tire Check Before Your Next Tahoe Trip

Match the Gear to How You Actually Drive

The right tire tracks your model and your real driving split more than any brand pitch, so a standard Crosstrek or Forester on all-seasons covers the paved run cleanly while a Wilderness trim (or a genuine dirt-road habit) is what justifies all-terrain. So which one is yours? Work down the list by trim and by where your tires actually spend their miles.

Outback Wilderness and Forester Wilderness: Subaru made the decision for you, and it's the right one. The 2026 Outback Wilderness comes standard with Bridgestone Dueler all-terrain tires on 225/65R17 wheels and 9.5 inches of ground clearance, per Subaru's specifications. The 2026 Forester Wilderness runs Yokohama Geolandar all-terrain tires at 235/60R17 and 9.3 inches of ground clearance, also per Subaru. Both are already configured for the exact split of I-80 highway miles and unpaved Sierra roads this route demands. Replace them only when tread warrants it, and use the same spec. Don't downgrade them.

Standard Outback (Premium, Limited, Touring): OEM size is 225/60R18 on most trims. A quality all-season in that size handles the I-80 corridor at highway speed, manages the summer afternoon thunderstorms that roll through the Sierra basin, and outlasts a comparable all-terrain in mileage by a meaningful margin. For a family doing six Tahoe weekends per summer on paved campground access roads, all-seasons are the practical answer.

Crosstrek: OEM sizes run 225/55R17 (base and Sport) or 225/55R18 (Limited). It's got 8.7 inches of ground clearance, which handles improved dirt roads without drama. All-season is the sensible daily-driver choice for the I-80 commute and the Tahoe run combined. If your trips regularly end on fire roads into the Sierraville Ranger District or similar unmaintained forest routes, the Crosstrek Wilderness (which includes OEM all-terrain tires from the factory) is a cleaner solution than swapping tires on a standard trim.

Standard Forester (non-Wilderness): OEM size 225/60R17. Same logic as the standard Outback. All-season for daily Auburn commuting and occasional Tahoe weekends. All-terrain if your off-pavement miles truly and regularly outnumber your paved miles over the course of a season.