If you have linked car insurance policies, they’ll likely have different renewal dates, but if you have one policy for all then the renewal dates should align. It may be that you have a single car insurance policy to which you can add multiple other cars – in this case, the renewal dates for each additional car should also align with the original date on the policy. However as with any kind of insurance policy it’s likely to differ between providers, so be sure to check your policy documents to understand how it applies to you.