Before you start

A valid licence from your home country while you settle in
A CURP, printed from the RENAPO portal
Proof of address in Baja California under three months old
A medical certificate of fitness to drive from an authorised institution, for a first Baja California licence
A booked appointment — Recaudación de Rentas will not attend walk-ins

Step-by-step

1
Buy Mexican liability insurance before anything else
US and Canadian auto policies generally do not provide liability cover inside Mexico, and Mexican law expects Mexican cover. Buy an annual Mexican policy for a car you keep here and a short-term online policy for occasional southbound trips in a US-plated vehicle. This is more urgent than the licence, because the licence is a convenience and the insurance is the thing that decides how a collision ends.
OnlineWho: YouSame dayRoughly MXN 4,000–12,000 a year for a car, depending on cover and vehicle
2
Book the appointment and assemble what Baja California checks
The trámite runs through the state Recaudación de Rentas offices, where biometrics, exams and issuance all happen in the same visit, and a prior appointment is compulsory. Bring official photo ID, a printed CURP, a comprobante de domicilio proving residence in the state, and the medical certificate from an authorised institution. Fees are updated periodically through the year, so check the current tabulador rather than a figure from a blog.
OnlineWho: YouDepends on appointment availability
3
Choose the validity deliberately — permanent is not maintenance-free
Baja California offers three-year and five-year licences and also a permanent one. The permanent licence is genuinely permanent in law, but the state's revenue law requires the holder to attend a Recaudación de Rentas office every five years from issue to update the photograph and personal data. Fail to do that within three months of the five-year mark and the licence loses both its validity and its permanent status — you start again. If you take the permanent option, put the revalidation in a calendar you will still have in five years.
In personWho: YouSame visitFees vary by class and validity and are updated during the year — the chofer classes run highest; confirm the current tabulador before you go
4
Get SENTRI if you will cross north more than occasionally
SENTRI gives you a dedicated lane at San Ysidro and Otay and is the difference between a fifteen-minute crossing and a two-hour one. Application is through the US Trusted Traveler Programs portal, costs USD 120 for five years and is non-refundable, and requires a background check and an in-person interview at an enrolment centre. Apply well before you need it — the queue for interviews is the slow part, not the vetting.
OnlineWho: Anyone crossing north regularlyMonths, dominated by interview availabilityUSD 120 per person for five years, non-refundable
5
If SENTRI is not available to you, get an RFID-capable document for Ready Lane
Ready Lane is the middle tier: a dedicated lane for travellers carrying an RFID-chipped document such as a US passport card, a border crossing card or a SENTRI card. It is materially faster than the general lanes and far easier to qualify for than SENTRI. The lane operates on set hours rather than around the clock, so check the schedule for the garita you use.
In personWho: Cross-border commutersAs long as the document takes to obtain
6
Treat the wait-time feed as a daily utility, and know both garitas
CBP publishes live wait times per lane and per crossing, and every commuter here runs one of the apps built on that feed. Otay Mesa is generally quicker than San Ysidro, particularly in the SENTRI and Ready Lanes, at the cost of a longer drive on the Mexican side. Peak northbound is roughly 6–10am and 4–8pm; the reliable windows are very early morning, mid-morning and late evening. Building your working day around the feed rather than around a fixed departure time is what experienced transfronterizos actually do.
Mobile appWho: Cross-border commutersDaily

Documents you’ll need

Valid foreign licence, and passport plus resident card
Printed CURP
Comprobante de domicilio in Baja California under three months old
Medical certificate of fitness from an authorised institution
Appointment confirmation and proof of payment
Mexican insurance policy documents, kept in the vehicle

Things most newcomers don’t know

Baja California's 'permanent' licence has a five-year homework assignment attached, and that is where people lose it.

The state's revenue law requires permanent-licence holders to attend a Recaudación de Rentas office every five years from the original issue to update the photo and personal data, without the licence losing its permanent character. If the update is not done within three months of that deadline, the licence loses both its validity and its permanent status. People take the permanent option precisely so they never have to think about it again, which is exactly the mindset that causes them to miss the revalidation.

Source: Ley de Ingresos del Estado de Baja California

SENTRI is the highest-value administrative task in the city and people put it off for years.

The gap between a general lane at 7am and a SENTRI lane at 7am is routinely an hour and a half, each way, several days a week. Priced at USD 120 for five years, no other single form you can fill in here returns as much time. The reason people delay is that the interview queue is long and opaque — which is the argument for starting it in your first month, not against starting it at all.

Source: US CBP

Your US car insurance stops at the border and the consequences of finding out the hard way are immediate.

US and Canadian policies generally do not provide the liability cover Mexican law expects, and Mexico treats a serious traffic collision as a matter for the authorities on the spot rather than something insurers settle later. Cross-border households run two vehicles and two mental models and mix them up. Buy Mexican liability cover for anything you drive south, including a weekend trip, and keep the policy in the glovebox.

Source: community-reported / insurer guidance

Which garita you use should shape where you live, not the other way round.

San Ysidro is the busiest land port of entry in the Western Hemisphere and Otay Mesa generally moves faster, especially in the trusted-traveler and Ready Lanes, but the two are twenty minutes apart on the Mexican side and serve different parts of San Diego County. Someone working in Otay Mesa or Chula Vista who rents in Playas has designed a bad life. Work out the crossing first, then the neighbourhood.

Source: US CBP border wait times

Common mistakes to avoid

Driving south on a US policy and assuming it covers you.
Turning up at Recaudación de Rentas without an appointment, or without the medical certificate.
Taking the permanent licence and forgetting the five-year revalidation until it is more than three months late.
Choosing a neighbourhood before working out which garita and which lane you will use.
Assuming today's wait times resemble last month's — enforcement posture and lane configuration change.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.