Most people will need to fly into the Denver International Airport. The airport is located approximately one hour away from Boulder. There are several options to get from the airport to Boulder. Some information is available here: (http://www.flydenver.com/)
Public transportation: The UMC (University Memorial Center, where the talks are held) is well served by the public bus system, which is run by RTD. Fares must be paid in cash as you board the bus, and no change is given. Transfers are valid for 3 hours and can be used on your return trip; ask for a transfer when you board.
The SKIP and DASH buses run north and south along Broadway, providing frequent service to NIST and downtown Boulder’s Pearl Street Mall. The HOP line provides service between the CU campus, Pearl Street, and the 29th Street Mall. Local bus fare for any of these three routes is $2.60 per ride. Local daily passes can be purchased when you board for $5.20.
The FF1 (all stops) and FF2 (express) buses also pick up along Broadway and travel between downtown Boulder and downtown Denver. The fare is $4.50 each way.
The AB1 bus runs directly from Denver International Airport (DEN) to Boulder for $9.00 each way and takes approximately 1 hour (longer at rush hour) to reach Boulder. There are several stops once the bus reaches Boulder. In Boulder the AB1 will travel along Table Mesa and Broadway.
More information is available at http://www.rtd-denver.com. There are also several phone apps with real-time bus arrival information. Search for “RTD” wherever you purchase apps.
(Despite its name, the "University of Colorado A Line" train from the airport DOES NOT go to Boulder.)
Car Rental: Rent a car at the airport. This is the most expensive option and may not save much time. Public transit access to the mountains, however, is quite limited, so renting a car may be advisable for any travels outside Boulder before or after the workshop. If you have accommodations near the university, a rental car is not really needed in Boulder. There is plenty of public transportation, a bike share program with plenty of bike paths. If you choose a hotel other than our conference hotels, you might need a car to get around. Also, there is affordable parking at the workshop venue. You can either pay for parking per day, or buy a week-long parking pass at the workshop check-in.
Examples of other modes of transportation from the airport to Boulder are: Green Ride and Super Shuttle
Taxi: Taxi service from the Denver airport to Boulder is approximately $90 each way.
Bike Share: For the full Boulder experience, consider the Boulder B-Cycle bike sharing program. For only $11, you can purchase a month-long membership that allows unlimited 30-minute rides. (This is plenty of time to reach most restaurants in Boulder.) There are stations within a short walk of all the hotels and the on-campus housing, and one right next to the conference venue. Just remember to cancel your membership once you depart Boulder to avoid being charged for the next month.