Short-term auto insurance is definitely a thing. However, many insurers don’t offer it. If you can find it, short-term insurance — which can provide coverage for as little as a single day, up to several months — is ideal if you are lending your car to someone and don’t want to add them to your existing policy under the visitor designation (and there are good reasons not to do this). It's also ideal when you are buying a new car and need temporary coverage for your old one while you wait for it to be sold.