Heavy Highway Contractor

Hello,

We are a prime contractor looking at a particular county bid job in Colorado which looks very promising. We have never bid in Colorado before, however--I am wondering if any of you are aware of any special requirements to submit a bid in Colorado from an out-of-state Contractor? The contract docs don't appear to require a CO contractor's license, but we've seen other states that require additional dues, payments, or requirements.

Am very grateful for any who are able to respond!