The quakes were both just north of Glenwood Springs.
The U.S. Geological Survey says a 3.4 quake struck at 3:02 a.m. The second, a 3.6 quake, came at 4:13 a.m.
People in Glenwood Springs, New Castle and Gypsum reported feeling the quakes.
The USGS says earthquakes of this intensity cause vibrations similar to the passing of a truck and would be very noticeable to people indoors, especially on upper floors.