It is very important that you have at least third party Mexican car insurance when you drive here. See our pages on "getting here" for all the details. You can buy insurance by the day before you cross the border into Mexico but it is cheaper and more convenient to call, fax or go online and purchase it with a credit card in advance of your trip. If you are going to spend more than about 20 days per year in Mexico it makes economic sense to buy an annual policy. Get a quote from our advertisers. There can be significant variation in the cost.