To know when your car insurance is due for renewal, you should first check your policy documents or contact your insurance provider. They will be able to provide you with the exact date when your policy is set to expire and when the renewal process begins. Generally, insurance companies send out renewal notices a month or two before the due date to give you ample time to make any necessary changes or updates to your policy. It is important to keep your insurance active and up-to-date to avoid any lapses in coverage, which could result in penalties or financial consequences in the event of an accident or claim. If you have misplaced your policy documents, you can also check your email for any notifications from your insurance company or log in to your online account to view your policy details. In summary, to determine when your car insurance is due for renewal, consult your policy documents, contact your insurance provider, or check your online account for any notifications or updates.