This is a simplified timeline for the Back to the Future series.

It includes the 3 films in bold black text, the Ride (originally at Universal Studios, but the footage is also available on the 25th Anniversary DVD) in purple bold text, the video game by Telltale Studios in red bold text, the animated series episodes in regular gray text, and the comic books (which either adapt some of the animated series episodes or are original stories) in green italicized text. While many may consider the animated series (and its spin-off comics) as non-canon, I see no reason not to include them, at least from a completionist standpoint.

The first column is the film, game, episode, or comic; the second is a simplified breakdown of the timeline, with the chronology ordered by the main present day events of Marty and Doc, and the periods of time they travel to (past, future, or alternate present) in parentheses. If they travel to the past those dates are placed first, and traveling to an alternate present or future are after the present day dates. The third column is the media format.

 

 

Back to the Future - Untold Tales and Alternate Timelines #1 - "When Marty Met Emmett" 1893 AD  (October 2, 1982 AD) Comic
Back to the Future - Untold Tales and Alternate Timelines #2 - "The Doc Who Never Was" 1893 AD  (October 24 - 25, 1962 AD) Comic
Back to the Future - Untold Tales and Alternate Timelines #3 - "In Search of Calvin Marty Klein" 1893 AD  (November 22, 1958 AD) Comic
Back to the Future - Untold Tales and Alternate Timelines #4 - "Peer Pressure" June 11, 1893 AD  (November 26, 1984 AD) Comic
Back to the Future - Untold Tales and Alternate Timelines #5 - "Clara's Story" June 12, 1893 AD Comic
Back to the Future - Untold Tales and Alternate Timelines #1 - "Looking for a Few Good Scientists" 1943 AD Comic
Back to the Future - Untold Tales and Alternate Timelines #2 - "Science Project" September, 1984 AD Comic
Back to the Future (November 5 - 12, 1955 AD)  October 25 - 26, 1985 AD DVD
Back to the Future - Untold Tales and Alternate Timelines #4 - "Emmett Brown Visits the Future" (April 18, 1938 AD)  October 26, 1985 AD  (August 8, 2015 AD) Comic
Back to the Future - Part II (November 12, 1955 AD)  October 26, 1985 AD / October 26 - 27, 1985A AD  (October 21, 2015 AD) DVD
Back to the Future - Untold Tales and Alternate Timelines #3 - "Jurassic Biff" (72,000,000 BC / October 21, 2015 AD) Comic
Back to the Future - Part III (September 2 - 7, 1885 AD / November 12 - 16, 1955 AD)  October 27, 1985 AD DVD
Back to the Future - Untold Tales and Alternate Timelines #6 - "Continuum Conundrum, Part 1" March 3, 1986 AD Comic
Back to the Future - The Game (July 17, 1876 AD / June 13, 1931 AD / August 25, 1931 AD / October 12 - 13, 1931 AD)  May 14 - 15, 1986 AD / May 14, 1986A AD / May 14, 1986B AD Video Game  (Wii)
Back to the Future - The Ride (October 25, 66,000,000 BC / October 25, 1,000,000 BC)  May 2, 1991 AD  (October 25, 2015 AD) DVD  (Ride Footage)
Back to the Future - The Animated Series:  "Brothers" (February 11 - 12, 1864 AD)  August 2, 1991 AD Animated Series  (1x01)
Back to the Future #1 - "The Gang's All Here" (January 18, 1927 AD)  1991 AD Comic
Back to the Future - The Animated Series:  "A Family Vacation" (1367 AD)  1991 AD Animated Series  (1x02)
Back to the Future - The Animated Series:  "Forward to the Past" (October 10, 3,000,000 BC)  1991 AD / 1991A AD Animated Series  (1x03)
Back to the Future #2 - "Forward to the Past" (October 10, 3,000,000 BC)  1991 AD / 1991A AD Comic
Back to the Future - The Animated Series:  "Witchcraft" (1000 BC / September 23 - 24, 1692 AD)  1991 AD Animated Series  (1x04)
Back to the Future - The Animated Series:  "Roman Holiday" (36 AD)  1991 AD Animated Series  (1x05)
Back to the Future #3 - "Roman Holiday" (36 AD)  1991 AD Comic
Back to the Future - The Animated Series:  "Go Fly a Kite" (September 2, 1752 AD)  1991 AD Animated Series  (1x06)
Back to the Future - The Animated Series:  "Time Waits for No Frog" / "Einstein's Adventure" (1532 AD)  1991 AD / (1790 AD)  1991 AD Animated Series  (1x07)
Back to the Future - The Animated Series:  "Batter Up" (September 1 - 2, 1897 AD)  1991 AD Animated Series  (1x08)
Back to the Future - The Animated Series:  "Solar Sailors" December 15, 1991 AD  (December 15, 2091 AD) Animated Series  (1x09)
Back to the Future - The Animated Series:  "Gone Fishin'" (August 5 - September, 1926 AD)  1992 AD Animated Series  (1x11)
Back to the Future - The Animated Series:  "Retired" (40,000 BC)  April 1, 1992 AD Animated Series  (1x12)
Back to the Future #4 - "Retired" (40,000 BC)  April 1, 1992 AD Comic
Back to the Future - The Animated Series:  "Dickens of a Christmas" (December 24 - 25, 1845 AD)  July, 1992 AD Animated Series  (1x10)
Back to the Future - The Animated Series:  "Clara's Folks" (March 3, 1850 AD)  1992 AD Animated Series  (1x13)
Back to the Future - The Animated Series:  "Mac the Black" (1697 AD)  1992 AD Animated Series  (2x01)
Back to the Future - The Animated Series:  "Put on Your Thinking Caps, Kids!  It's Time for Mr. Wisdom!" (127 AD / August 27, 1883 AD)  1992 AD Animated Series  (2x02)
Back to the Future - The Animated Series:  "A Friend In Deed" (1875 AD)  1992 AD Animated Series  (2x03)
Back to the Future - The Animated Series:  "Marty McFly PFC" (September 27 - 29, 1944 AD)  1992 AD Animated Series  (2x04)
Back to the Future - The Animated Series:  "Verne's New Friend" (April 7, 1933 AD)  1992 AD Animated Series  (2x05)
Back to the Future - The Animated Series:  "Bravelord and the Demon Monstrux" 1992 AD Animated Series  (2x06)
Back to the Future - The Animated Series:  "The Money Tree" 1992 AD Animated Series  (2x07)
Back to the Future - The Animated Series:  "A Verne by Any Other Name" (1870 AD / October 29, 1888 AD)  1992 AD Animated Series  (2x08)
Back to the Future - The Animated Series:  "Hill Valley Brown-Out" 1992 AD Animated Series  (2x09)
Back to the Future - The Animated Series:  "My Pop's an Alien" (1967 AD)  1992 AD Animated Series  (2x10)
Back to the Future - The Animated Series:  "Super Doc" (February 15, 1952 AD)  1992 AD Animated Series  (2x11)
Back to the Future - The Animated Series:  "St. Louis Blues" (June 29, 1904 AD)  1992 AD Animated Series  (2x12)
Back to the Future - The Animated Series:  "Verne Hatches an Egg" (100,000,000 BC)  1992 AD Animated Series  (2x13)
Back to the Future #1 - "Forward to the Future" 1992 AD  (June 3, 2585 AD) Comic
Back to the Future #2 - "The Jewel in the Tower" 1992 AD  (June 3, 2585 AD / 2,991,299,129,912,995 AD)  
Back to the Future #3 - "The Great Indoors" 1992 AD  (2,991,299,129,912,995 AD)