Transportation to and from Boulder is available by rental car, limousine, or bus. Reservations are suggested. A regional bus service, the RTD, provides transportation between DIA and Boulder.
Buses leave every half-hour to an hour depending on the time of day.
Trip time is about 90 minutes, with a final stop at the Boulder bus station. Local Boulder taxis service is also available. As you leave the airport, continue on Pena Blvd. The NIST visitor parking lots are located at the corner of Millikan Road and Compton Road, and at the corner of Millikan Road and Lawrence Road.