Great Sand Dunes National Park is located 35 miles northeast of Alamosa, Colorado, reached by U.S. 160 and Colorado 150 from the south, or from Colorado 17 and County Lane 6 from the west.

By car: From Denver, Colorado Springs, or Pueblo, the fastest route is south on I-25 to Walsenburg, west on US 160, north on state highway 150. For a more scenic drive from Denver or Colorado Springs, you may also get on US 285 south, then state highway 17 south, then County Lane 6 east.  From Albuquerque, drive north on I-25 to Santa Fe, then north on US 285 to Alamosa.

By air: Commercial air service is available to a small airport at Alamosa, Colorado. Colorado Springs and Denver are served by many commercial airlines. Rental cars from major rental companies are available at airports in Colorado Springs and Denver. Rental cars may be available in Alamosa: call L&M Auto Rentals at 719-589-4651.

By bus: There is no public transportation to the park itself, but Greyhound Bus Lines serves Alamosa and Blanca, Colorado. Call 800-231-2222 for fare and schedule information.