The basic design of Colorado 's license plate has been in use since 1960 ( except for 1973 and 1975 -- 76 ) .
The basic design of Colorado 's license plate is a range of mountains against a white or green background .
The basic design of Colorado 's license plate , a range of mountains against a white or green background , has been in use since 1960 ( except for 1973 and 1975 -- 76 ) .