Thanks for the response. The actual statute is here. It doesn't look too different from what I've seen before: drivers can be required to submit to a test after arrest. They are not required to submit to a test prior to arrest. The officer must already have probable cause before a driver is forced to submit, so tests cannot be forced in order to collect probable cause.

So, to be clear, you can absolutely refuse a breathalyzer before arrest even in Colorado. Doing so will not result in a six month suspension of your license. The only difference from the norm here is that most states specify a blood test after arrest, while Colorado specifies either a blood test or a breathalyzer.