FREX served the southern portion of the Colorado Front Range and during its tenure was operated via different contracts by Veolia Transport & Laidlaw Transit.
It was added as a part of Mountain Metropolitan Transit, which serves the Colorado Springs and El Paso County areas.
On February 8, a successful bid of $1.44 million, an average of $160,000 per bus (a substantial loss), was made by York County Transportation Authority in Pennsylvania.
The city of Castle Rock did not wish to help fund FREX any longer, so they lost the service at their stop.
[2] The FREX bus service made many stops along the Front Range, including many in the Denver metropolitan area.