Cars and any other vehicles only need to have auto insurance when the car is being driven down the road and if you're not using the car or driving the vehicle down the road and the car is just sitting around then you do not need to have insurance on the vehicle.
And honestly if you're not driving the car then it's a waste of money to keep auto insurance on the vehicle however you usually do need to keep license plates on the vehicle in some towns and have those license plates current or the vehicle can be considered an abandoned vehicle and to have current license plate it needs insurance but you could get the insurance for a month and register the vehicle or renew the license plates and then cancel or drop the auto insurance.