Colorado offers several programs that would help with down payment assistance however some counties offer programs as well that may benefit the Buyer better than the state programs.  Let's go over all possible programs and get you on the one that works for you on the long run.  

It all varies on the program you will be using however the lowest would be 3.5%.  

Having a higher credit score will help you in the long run, however having at least 620 credit score will help you get down payment assistance.

I highly recommend getting pre-approved with a lender at first before looking at houses.  If you are needing a lender recommendation, send me a message and I will be happy to get you to the right lender for your needs. 

As long as the house isn't a new built home, you are looking to take 30 days to get to closing.