A couple links for you, Ray:

Rockies Ride LINK
April 7 RockiesRide Schedule
Rockies170407_pickup.pdf

RTD Site LINK

If you do use RTD, I would suggest having someone drop you at the Park n Ride, and pick you up after, as opposed to leaving your vehicle. There have been times when there were a lot of break-ins, but those were typically night games that ran long (rain delays, extra innings, etc.). A day game may not be that risky.