The Tiefort Mountains are located in the Mojave Desert

Mojave Desert

The Mojave Desert occupies a significant portion of southeastern California and smaller parts of central California, southern Nevada, southwestern Utah and northwestern Arizona, in the United States...

 in San Bernardino County

San Bernardino County, California

San Bernardino County is a county in the U.S. state of California. As of the 2010 census, the population was 2,035,210, up from 1,709,434 as of the 2000 census...

, southeastern California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

.

The range is located at the southern end of the Fort Irwin Military Reservation

Fort Irwin Military Reservation

Fort Irwin & the National Training Center is a major training area for the United States Military and is a census-designated place located in the Mojave Desert in northern San Bernardino County, California. Fort Irwin sits at an elevation of . The 2010 United States census reported Fort Irwin's...

, and is approximately 12 miles long.

The mountains lie east of Fort Irwin and Bicycle Dry Lake

Bicycle Lake

Bicycle Lake is a dry lake in the Mojave Desert of San Bernardino County, California, northeast of Barstow. The lake is approximately long and at its widest point.Bicycle Lake is on federal lands and contains the Bicycle Lake Army Airfield....

, and are entirely within the military reservation, which is off-limit to the general public. The Tiefort mountains are about 16 miles north of Interstate 15

Interstate 15 in California

In the U.S. state of California, Interstate 15 is a major north–south route through the San Bernardino, Riverside, and San Diego Counties, and it has a length of in the state. It is a major thoroughfare for traffic between Southern California and Las Vegas, Nevada, as well as points beyond...

, in the greater Barstow

Barstow, California

Barstow is a city in San Bernardino County, California, United States. The population was 22,639 at the 2010 census, up from 21,119 at the 2000 census. Barstow is located north of San Bernardino....

area.