Ruta 40 (Patagonia Section)

The Patagonian section of Ruta 40 is largely paved, particularly the most trafficked segments. However, significant unpaved sections remain, especially south of Bariloche towards Perito Moreno and El Chaltén (though some of these are being paved). During summer, these gravel roads are manageable with a standard 2WD car, but expect dust, potholes, and corrugation. In winter, unpaved sections can become impassable due to snow and ice, requiring a 4x4 or chains, if open at all.

Driving Ruta 40 in winter (May-September) is generally not recommended for a full north-to-south journey, particularly for tourists unfamiliar with extreme winter driving. Many sections, especially in the south and high mountain passes, close due to heavy snow and ice. Daylight hours are very short. If you must drive, a 4x4 vehicle equipped with snow tires or chains is essential, and you should be prepared for potential delays and closures. Focus on specific, open areas if traveling during this time.

In summer (December-February), especially in southern Patagonia (e.g., El Calafate, El Chaltén), you can enjoy incredibly long daylight hours, often up to 16-17 hours around the summer solstice. This allows for extensive driving and sightseeing. In winter (June-August), daylight is minimal, often as little as 8-9 hours, significantly limiting travel and activity time.

Patagonian winds are legendary and can be a significant factor, especially during summer (December-February) and spring (October-November). They can be very strong and gusty, posing challenges for driving, particularly for smaller vehicles or campervans. Always keep a firm grip on the steering wheel, be aware of crosswinds, and anticipate strong gusts when opening car doors.

For most of the paved Ruta 40 and even many unpaved sections during summer, a standard 2WD car with good ground clearance is sufficient. However, if you plan to venture onto more rugged side roads, or if you are traveling in the shoulder seasons when weather can be unpredictable, a 4x4 offers greater peace of mind and capability.

While gas stations exist, distances between them can be vast, especially in more remote sections of the Patagonian steppe. It's crucial to refuel whenever you see a gas station, even if your tank isn't empty, and carry an extra fuel canister if venturing into particularly isolated areas. Plan your route carefully using a reliable map or GPS, noting fuel stops.

Ruta 40 is entirely within Argentina. If you plan to only drive Ruta 40, renting in Argentina is usually more straightforward. If your itinerary includes crossing the border into Chile, you must inform your car rental company in advance to obtain the necessary international permits and insurance, which incurs an additional fee and requires lead time. Renting and returning the car in the same country is generally simpler and cheaper.