Basically, you should shop for a new commercial vehicle insurance Colorado policy, whenever you feel like you need more or less coverage, or when you want to ensure that there is no better offer that the one you have or already pay for.
For example, if you notice that your rates went up lately, it may be because of your insurance. Make sure your insurance company informs you of changes that will occur at policy renewal. If you do not agree with them, it is time to re-shop for insurance.
When it comes to homeowner insurance for example, it is not a bad idea to shop annually and compare costs and coverage with different insurance companies. Evaluating and comparing offers ensure that you will make an informed choice. Once you receive the renewal paperwork from your current insurer and you know your future rates, you will have about 30-40 days to shop around and see if you can get a better offer from another carrier (renewal paperwork typically comes in advance).
It is quite common for insurance companies to make changes in rates and cost of policies annually. However, if your premiums jump too high (with more than 10%), it is definitely time to look for a better offer. Besides, re-shopping is also for adding coverage for particular perils.