Open Sonoran desert highway curving toward the distant blue Sea of Cortez

The Arizona-to-Sonora-coast drive is one of the great Mexican road trips: cross at Nogales, run Highway 15 down through the desert, and reach the Sea of Cortez at Guaymas and San Carlos. Done right – with the correct permits and insurance – it is an easy, scenic journey. Here is how the whole route works.

Quick answer: Cross at Nogales (Mariposa port), take the Highway 15 toll road south through Magdalena and Hermosillo to Guaymas and San Carlos – about 390 miles, roughly 6 hours of driving. Mainland Sonora needs either the Only Sonora vehicle permit or a full TIP, plus an FMM and Mexican auto insurance.

The route at a glance

From Nogales, Highway 15 heads south past Magdalena, on to Hermosillo (the midpoint), then down to Guaymas, with San Carlos just northwest on the coast. It is a maintained four-lane toll road for most of the way. Keep pesos for the plazas, fuel up at the larger towns, and drive the route in daylight.

Only Sonora permit vs a full TIP

This is the key decision for any mainland Sonora trip. Unlike Rocky Point (a hassle-free zone needing no permit), San Carlos requires you to temporarily import your vehicle:

Either way you also need an FMM tourist permit. Bring your passport, vehicle title/registration, and a major credit card in the driver’s name.

Costs, tolls, and timing

Budget for highway tolls (a series of plazas, cash in pesos is easiest), fuel, your FMM, the vehicle permit, and Mexican auto insurance. Most travelers do the drive in a single long day or split it with an overnight in Hermosillo.

Insurance: do not skip it

An accident in Mexico without valid Mexican insurance can mean your vehicle is held and you are personally liable. A Mexican policy from an authorized insurer is required and inexpensive for a coast trip – buy it online before you go. Review coverage and cost and the full documents checklist before you leave.

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Frequently asked questions

How long is the Nogales to San Carlos drive?

About 390 miles and roughly 6 hours of driving on Highway 15 south through Hermosillo to Guaymas and San Carlos. Many travelers split it with an overnight in Hermosillo.

What is the Only Sonora vehicle permit?

It is a Sonora-only temporary vehicle import permit issued near the border. It is cheaper than a national TIP and skips the large refundable deposit – ideal if your trip stays within Sonora, like San Carlos.

When do I need a full TIP instead?

If you drive beyond Sonora into the rest of mainland Mexico. The full temporary vehicle import permit, issued by Banjercito, involves a refundable deposit and covers the whole country.

Do I need Mexican insurance for the Sonora coast?

Yes. Your US auto policy is not valid in Mexico. Mexican auto insurance from an authorized insurer is required for the entire trip and can be bought online in minutes.

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