I’ve had several requests from people driving to Denver to start their CT thruhikes concerning long-term parking. I need help from the group here - I used to have a parking “source”, but not now. Outside of one of the cheap, long-term DIA options, I don’t have any good recommendations. But, parking at DIA does give you access to the bus/light rail. FWIW
Hike on,
TG
TrailGuy