1913   Black/White                 1936   White/Blue

1914   White/Dark Blue             1937   Black/Silver
1915   Black/Yellow                1938   White/Turquoise
1916   White/Brown                 1939   Yellow/Black
1917   Black/Pink                  1940   Black/Yellow
1918   White/Black                 1941   Yellow/Black
1919   Silver/Dark Brown           1942   White/Maroon
1919 TAB   Silver/Dark Brown       1943   Yellow/Black
1920 TAB   Silver/Dark Blue & Red  1944 TAB   Black/Yellow
1920   Silver/Dark Brown           1945   White/Black
1921   Silver/Dark Blue            1946   Yellow/Black
1922   Black/White                 1947   Black/Yellow
1923   White/Black                 1948   Black/Aluminum
1924   Black/Beige                 1949   Yellow/Black
1925   White/Maroon                1950   Green/White
1926   White/Green                 1951   White/Green
1927   White/Black                 1952 TAB   Black/Yellow
1928   Maroon/Beige                1953   Green/Yellow
1929   White/Maroon                1954   White/Black
1930, 1932   Orange/Black          1955   Black/White
1931, 1933   Black/Orange          1956   White/Black
      1934   Yellow/Black          1957   Black/Orange
      1935   Black/Yellow          1958   Dark Green/Light Green

1959, 1962, 1964, 1966, 1968, 1970            White/Green
1960, 1963, 1965, 1967, 1969                  Green/White
                              1971, 1973  FR  Green/White
                              1972, 1974  FR  White/Green

BASEPLATES   Aluminum 1977-present except 1979-80 Type 2.
1975-76   CENTENNIAL TYPES 1-2 FR  Red & Blue/White & Light Blue
1976      CENTENNIAL TYPE  3  FR  Red/White
1977-2000 MOUNTAIN            PR  White/Green
2000-24   NEW MOUNTAIN        FR  Green & Gray/White
1989-93   DESIGNER            PR  Blue/White, Red & Yellow
1993-2000 DENIM               PR  White/Light Blue, Red & Yellow
2000-24   NEW DESIGNER        FR

STICKERS   All are Fully Reflective.

           Black Serial 1961, 1978-82, 1984-2000.
           Colored Serial 1976, 1983, 2001-24.

1961       Green/White        1980       Tan/Red
1976       Blue/White         1980  DEC  Black/Orange
1978  DEC  Black/White        1981       Blue/White
1979       Black/Yellow       1982       Black/Orange
1979  DEC  Black/Orange                 (some APR-JUN Black/Red)

 MONTH    1979 & 1981       1980
JAN-MAR   White/Black   Yellow/Black
APR-JUN   White/Red     Yellow/Red
JUL-SEP   White/Blue    Yellow/Blue
OCT-NOV   White/Brown   Yellow/Brown
DEC (81)  White/Brown

1982-88   MONTH   Red/White
1989-2024 MONTH   Blue/White

STICKER COLORS 1983-PRESENT         EMISSIONS TEST  NO TEST
1983                                Black/Red       Gold/Blue
1984                                Red/White       Black/White
1985, 1987                          Red/White       Black/Yellow
1986, 1988                          White/Red       Yellow/Black
      1989, 1992, 1995, 1998        Blue/White      Orange/White
      1990, 1993, 1996, 1999        Brown/White     Green/White
      1991, 1994, 1997              Red/White       Black/White
                        2000, 2003  Black/Red       Black/Yellow
                        2001        Blue/White      Black/Orange
                        2002        Black/Yellow    Green/White

Emissions Test required 1983-2003 only in these counties:
Adams, Arapahoe, Boulder, Denver, Douglas, El Paso, Jefferson,
Larimer, Weld.

2004, 2008, 2012, 2016, 2020, 2024   Black/Light Green
2005, 2009, 2013, 2017, 2021         Black/Orange
2006, 2010, 2014, 2018, 2022         Black/Yellow
2007, 2011, 2015, 2019, 2023         Black/Red