- 1908 – Founded as Società Ginnastica Tritium
- 1919–20 – Various local tournaments
- 1920–21 – Various local tournaments
- 1921–22 – Various local tournaments
- 1922–23 – Various local tournaments
- 1923–24 – Won youth tournament Targa della Vittoria
- 1924–25 – Torneo della Canicola
- 1925–26 – Campionato Libero Brianteo
- 1926–27 – Various local youth tournaments
- 1927–28 – 7th in Division 3
- 1928–29 – 5th in Division 3
- 1929–30 – 7th in Division 3
- 1930–31 – 8th in Division 3
- 1931–32 – 8th in Division 3
- 1932–33 – Inactive
- 1934 – Rebuilted as F.G.C. Trezzo
- 1934–35 – 3rd in Division 3
- 1935–36 – 2nd in Division 2 – opted for A.S. Trezzo denomination
- 1936–37 – 4th in Division 2 – elected to Div. 1
- 1937–38 – 6th in Division 1 – applied relegation to Div. 2
- 1938–39 – 2nd in Division 2
- 1939–40 – 4th in Division 2
- 1940–41 – 3rd in Division 2
- 1941–42 – 4th in Division 2
- 1942–43 – 1st in Division 2 – promoted to Div. 1
- 1943–44 – Inactive
- 1944–45 – 3rd in the local war tournament group G – back to S.S. Tritium denomination
- 1945–46 – 5th in Division 1
- 1946–47 – 4th in Division 1
- 1947–48 – 5th in Division 1
- 1948–49 – 14th in Division 1 – relegated to Div. 2
- 1949–50 – Inactive
- 1950–51 – Local tournaments
- 1951–52 – 10th in Division 2
- 1952–53 – 4th in Division 2 – promoted to Div. 1
- 1953–54 – 2nd in Division 1 – promoted to Promozione
- 1954–55 – 7th in Promozione
- 1955–56 – 5th in the National Amateur League Champ.
- 1956–57 – 4th in the National Amateur League Champ.
- 1957–58 – 3rd in the National Amateur League Champ.
- 1958–59 – 14th in the National Amateur League Champ.
- 1959–60 – 13th in 1st Category
- 1960–61 – 12th in 1st Category
- 1961–62 – 15th in 1st Category – relegated to 2nd Cat.
- 1962–63 – 7th in 2nd Category
- 1963–64 – 11th in 2nd Category
- 1964–65 – 9th in 2nd Category
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- 1965–66 – 10th in 2nd Category
- 1966–67 – 1st in 2nd Category – promoted to 1st Cat.
- 1967–68 – 7th in 1st Category
- 1968–69 – 11th in 1st Category
- 1969–70 – 5th in 1st Category
- 1970–71 – 3rd in 1st Category
Won Lombardy Cup
- 1971–72 – 8th in 1st Category
- 1972–73 – 6th in 1st Category
- 1973–74 – 1st in 1st Category – promoted to Promozione
- 1974–75 – 3rd in Promozione
- 1975–76 – 1st in Promozione – promoted to Serie D
- 1976–77 – 8th in Serie D
- 1977–78 – 7th in Serie D
- 1978–79 – 15th in Serie D – relegated to Promozione
- 1979–80 – 6th in Promozione
- 1980–81 – 5th in Promozione
- 1981–82 – 7th in Promozione
- 1982–83 – 7th in Promozione
- 1983–84 – 11th in Promozione
- 1984–85 – 4th in Promozione
- 1985–86 – 4th in Promozione
- 1986–87 – 8th in Promozione
- 1987–88 – 10th in Promozione
- 1988–89 – 14th in Promozione – relegated to 1st Cat.
- 1989–90 – 1st in 1st Category – promoted to Promozione
- 1990–91 – 1st in Promozione – promoted to Eccellenza
- 1991–92 – 9th in Eccellenza
- 1992–93 – 3rd in Eccellenza
- 1993–94 – 6th in Eccellenza
- 1994–95 – 4th in Eccellenza
- 1995–96 – 6th in Eccellenza
- 1996–97 – 14th in Eccellenza – relegated to Promozione
- 1997–98 – 9th in Promozione
- 1998–99 – 3rd in Promozione
- 1999–00 – 7th in Promozione
- 2000–01 – 4th in Promozione
- 2001–02 – 12th in Promozione
- 2002–03 – 1st in Promozione – promoted to Eccellenza
- 2003–04 – 7th in Eccellenza
- 2004–05 – 2nd in Eccellenza – promoted to Serie D
- 2005–06 – 3rd in serie D, group B. Eliminated in the playoff's national final phase. Eliminated in Coppa Italia serie D.
- 2006–07 – 7th in serie D, group B. Eliminated in Coppa Italia serie D.
- 2007–08 – 2nd in serie D, group B.
- 2008-09 – 6th in serie D, group B.
- 2009-10 – 1st in serie D, group B. Promoted to Lega Pro Seconda Divisione. Changed its name to Tritium Calcio 1908.
- 2010-11 – 1st in Lega Pro Seconda Divisione, group A. Promoted to Lega Pro Prima Divisione.
- 2011-12 – 12th in Lega Pro Prima Divisione group A.
- 2012-13 – in Lega Pro Prima Divisione group A.
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