The 2012 Chiefs became the first team since the 1929 Buffalo Bisons to not lead in regulation through any of their first nine games.
In 1958, Lamar Hunt's desire to secure a football team grew stronger after watching the NFL Championship Game between the New York Giants and Baltimore Colts.
In 1959, Lamar Hunt initiated discussions to establish a professional football league to rival the National Football League (NFL).
In November 1960, Don Rossi resigned as the general manager for the Kansas City Chiefs after serving for half of the season.
From 1960 to 1967, the Chiefs uniforms consisted of red or white jerseys, with white pants.
From 1960 to 1969, the Chiefs/Texans won 87 games, the most in the ten-year history of the AFL.
In 1960, Lamar Hunt began serving as the team's president, a role he held until 1976.
In 1960, the Chiefs began playing as the Dallas Texans, owned by league founder Lamar Hunt.
In 1960, the Texans' helmet featured the state of Texas. Lamar Hunt later sketched the arrowhead design, inspired by the San Francisco 49ers' logo.
In 1960, when the Texans began playing, the team's logo consisted of the state of Texas in white with a yellow star marking Dallas's location. The Texans' uniforms originally featured Columbia blue and orange, but the team reverted to red and gold, which remain the franchise's colors after relocation to Kansas City.
In 1962, the Kansas City Chiefs were victorious and won an AFL championship.
The 1971 game against the Miami Dolphins surpassed the 1962 AFL Championship Game as the longest ever at 82 minutes and 40 seconds.
From 1963, trumpeter Tony DiPardo and The T.D. Pack Band played live music at every Chiefs home game.
In 1963, the team moved to Kansas City and adopted its current name, the Kansas City Chiefs.
In 1966, the Kansas City Chiefs cruised to an 11–2–1 record and defeated the defending AFL Champion Buffalo Bills in the AFL Championship Game.
In 1966, the team's dominance helped Lamar Hunt become a central figure in negotiations with NFL Commissioner Pete Rozelle to agree on an AFL–NFL merger.
In January 1967, following the 1966 seasons, it was agreed that a merged league championship game would be played between the AFL and NFL champions.
From 1960 to 1967, the Chiefs uniforms consisted of red or white jerseys, with white pants.
In 1967, the Kansas City Chiefs were invited to play the NFL's league champion Green Bay Packers in the first AFL-NFL World Championship Game. The Chiefs lost the game 35-10.
From 1960 to 1969, the Chiefs/Texans won 87 games, the most in the ten-year history of the AFL.
In 1969, Kansas City hosted a Thanksgiving Day game against the Denver Broncos, the first Thanksgiving Day game in Kansas City since 1969. The Chiefs defeated the Broncos 19–10.
In 1969, head coach Hank Stram honored trumpeter Tony DiPardo with a Super Bowl ring for the team's victory in Super Bowl IV.
In 1969, the Kansas City Chiefs defeated the Oakland Raiders 17–7 in the AFL Championship Game.
In 1969, the Kansas City Chiefs won an AFL championship and Super Bowl IV.
Most of the pieces of the team that won Super Bowl IV in 1969 were still in place for the 1971 season.
In 1971, the Kansas City Chiefs tallied a 10–3–1 record and won the AFC West Division. They lost a Christmas Day playoff game against the Miami Dolphins 27–24 in double overtime.
Arrowhead Stadium has been the Chiefs' home field since 1972. The stadium cost $53 million to build.
From 1972 to 1993, the stadium had an artificial AstroTurf surface.
In 1972, the Kansas City Chiefs moved into the newly constructed Arrowhead Stadium at the Truman Sports Complex outside of downtown Kansas City. Willie Lanier won the NFL Man of the Year Award.
In 1973, quarterback Len Dawson won the NFL Man of the Year Award.
In 1973, the Chiefs had grey facemask bars on their helmets.
The 1973 season was the Kansas City Chiefs' last winning season for seven years.
In 1974, Hank Stram was fired following a 5–9 season.
In 1974, the Chiefs changed their helmet facemask bars from grey to white, becoming one of the first teams in the NFL to use a non-gray facemask.
From 1975 to 1988, the Kansas City Chiefs became a team that rarely won, providing Chiefs fans with futility.
In 1976, Jack Steadman was promoted to team president for the Kansas City Chiefs, succeeding Rossi.
In 1976, Lamar Hunt's tenure as the Kansas City Chiefs' president concluded.
In 1977, Jack Steadman was promoted to team president of the Kansas City Chiefs, succeeding Lamar Hunt.
In 1980, Coach Marv Levy cut future Hall of Fame Kicker Jan Stenerud and signed Nick Lowery, who would become the most accurate kicker in NFL history.
In 1981, running back Joe Delaney rushed for 1,121 yards and was named the AFC Rookie of the Year.
In 1982, the NFL Players Association strike curbed the Chiefs' chances of returning to the postseason. Joe Delaney died while trying to save children from drowning.
Due to declining health, Tony DiPardo took a leave of absence from the band from 1983 to 1988.
In 1983, John Mackovic took over head coaching duties for the Kansas City Chiefs after Marv Levy was fired.
In 1986, John Mackovic coached the Kansas City Chiefs to their first postseason appearance in 15 years in the NFL playoffs, but lost to the New York Jets.
In December 1988, Jim Schaaf was fired from his position as general manager of the Kansas City Chiefs.
On December 19, 1988, Lamar Hunt hired Carl Peterson as the Kansas City Chiefs' new president, general manager, and chief executive officer.
From 1975 to 1988, the Kansas City Chiefs became a team that rarely won, providing Chiefs fans with futility.
In 1988, Carl Peterson was hired to replace Jack Steadman as team president of the Kansas City Chiefs.
Tony DiPardo's leave of absence due to declining health ended in 1988.
From 1989 to 1999, the Chiefs uniforms consisted of red or white jerseys, with white pants.
In 1989, Tony DiPardo returned to the band by popular demand and his daughter took over as bandleader.
In 1990, the Kansas City Chiefs participated in a preseason exhibition game dubbed the American Bowl in Berlin.
Since 1990, the Chiefs were the fourth team to miss the playoffs with a 10-6 record.
Dating back to the Chiefs' home opener in 1991, the Chiefs had 155 consecutive sellout games until mid-2009.
From 1972 to 1993, the stadium had an artificial AstroTurf surface.
From 1993 to 2017, the Kansas City Chiefs struggled in the playoffs, losing ten of twelve games, including an eight-game losing streak.
In 1993, with Joe Montana and Marcus Allen, the Kansas City Chiefs reached their first AFC Championship Game appearance against the Buffalo Bills, but lost 30-13.
In 2015, the Chiefs defeated the Houston Texans 30-0 to earn their first NFL playoff win in 23 seasons, dating back to the 1993–94 NFL playoffs
Since the 1994 NFL season, Arrowhead Stadium has had a natural grass playing surface.
In 2014, the Chiefs attempted to make the playoffs for the second straight season for the first time since 1995, finishing 9-7 and getting eliminated in Week 17.
In the 1995 NFL playoffs, the Kansas City Chiefs lost to the Indianapolis Colts 10–7 after kicker Lin Elliot missed three field-goal attempts.
From 1996 to 2006, the Kansas City Chiefs averaged 77,300 fans per game, second in the NFL behind the Washington Redskins.
In 1996, general manager Carl Peterson commented on fans yelling "CHIEFS!" at the end of "The Star-Spangled Banner" before home games and sometimes at road games, expressing that the players loved it.
In 1997, the Kansas City Chiefs drafted tight end Tony Gonzalez and lost their playoff game against the Denver Broncos 14-10, despite a 13-3 season.
Coach Marty Schottenheimer announced his resignation from the Kansas City Chiefs following the 1998 season.
From 1989 to 1999, the Chiefs uniforms consisted of red or white jerseys, with white pants.
On January 23, 2000, Derrick Thomas was paralyzed in a car accident. He later died from complications related to this injury a few weeks later.
In 2000, Kansas City Chiefs fans would chant while pointing in the direction of the visiting team, "We're gonna beat the hell outta you...you...you, you, you, you!" over the song "Rock and Roll Part 2".
At the Kansas City Chiefs' September 23, 2001, home game against the New York Giants, Chiefs fans gave the opposing Giants a standing ovation.
In 2001, Dick Vermeil was hired as the Chiefs' head coach. The Chiefs traded a first-round draft pick to St. Louis for quarterback Trent Green and signed free agent running back Priest Holmes.
In 2002, the Chiefs improved to an 8-8 record but still missed the postseason.
In 2003, the Chiefs began the season with nine consecutive victories. They finished with a 13-3 record and lost to the Indianapolis Colts 38–31 in the AFC Divisional Playoffs. Priest Holmes surpassed Marshall Faulk's single-season touchdown record, scoring his 27th rushing touchdown.
In 2010, the Chiefs secured their first AFC West title since 2003.
In 2015, the streak achieved by the Chiefs broke a franchise record for nine straight wins in 2003
In 2004, the Chiefs finished the season with a 7–9 record.
In 2005, Sports Illustrated named Arrowhead Stadium the "toughest place to play" for opposing teams.
In 2005, the Chiefs finished with a 10–6 record but missed the playoffs. Dick Vermeil announced his retirement prior to the final game of the season.
In 2006, Herm Edwards was introduced as the Chiefs' tenth head coach. Trent Green suffered a severe concussion in the season opener.
In 2006, Jack Steadman remained with the Kansas City Chiefs franchise in various positions, despite being relieved of his general manager duties in 1988.
In 2006, after Lamar Hunt's death, his wife, Norma, and children became legal owners of the Kansas City Chiefs. Clark Hunt became chairman and CEO.
In 2006, studies by Bizjournals gave the Kansas City Chiefs high marks for consistently drawing capacity crowds, averaging 77,300 fans per game from 1996 to 2006.
In 2006, the Chiefs wore their white jerseys with white pants at home for the season opener against the Cincinnati Bengals, with the intention of making the Bengals wear their black uniforms in hot weather.
In 2006, the Kansas City Chiefs owner Lamar Hunt passed away, after which his family, including his son Clark Hunt, maintained ownership of the team.
In 2006, the NFL banned Gary Glitter's original version of the song "Rock and Roll Part 2" after his conviction on sexual abuse charges in Vietnam. A cover version by Tube Tops 2000 was used until 2015.
In 2007, after starting the season with a 4–3 record, the Chiefs lost the remaining nine games. Tony Gonzalez broke Shannon Sharpe's NFL record for touchdowns at the tight end position.
In 2007, the Kansas City Chiefs honored Lamar Hunt and the AFL with a special patch. It features the AFL's logo from the 1960s with Hunt's "LH" initials inside the football.
In 2008, Carl Peterson announced his resignation from his positions as general manager, chief executive officer, and team president of the Kansas City Chiefs.
In 2008, the AFL patch became permanently affixed to the left chest of both Kansas City's home and away jerseys.
In 2008, the Chiefs began the season with the youngest team in the NFL. Brodie Croyle was injured, and Tyler Thigpen and Damon Huard started at quarterback. Tony Gonzalez requested a trade, and Larry Johnson faced legal trouble.
In 2008, the Chiefs ended the season with a franchise-worst 2–14 record.
In 2009, the Chiefs finished with a 4-12 record, just a two-game improvement upon their record from the 2008 season.
The T.D. Pack Band played live music at every Chiefs home game until 2008.
On January 13, 2009, the Kansas City Chiefs named Scott Pioli, an executive from the New England Patriots, as the team's new general manager.
On January 23, 2009, Herm Edwards was fired as head coach of the Kansas City Chiefs.
In April 2009, Tony Gonzalez was traded to the Atlanta Falcons. Todd Haley fired offensive coordinator Chan Gailey.
In May 2009, Denny Thum was officially appointed as the full-time president of the Kansas City Chiefs after serving as interim president.
Beginning in 2009, the team has alternated between white and red pants for road games during the season.
Due to renovations at Arrowhead Stadium, the band did not return to perform at the stadium for the 2009 season.
In 2009, an average ticket to a Chiefs game cost $81.
In 2009, the Chiefs' 155-game sellout streak ended with the final home game of the season against the Cleveland Browns, resulting in the first local TV blackout in over 19 years.
In select games for the 2009 season, the Chiefs, as well as the other founding teams of the American Football League, wore a "throwback" uniform to celebrate the AFL's 50th anniversary.
On September 14, 2010, Denny Thum resigned from his position as president of the Kansas City Chiefs.
In December 2010, Tony DiPardo was hospitalized after suffering a brain aneurysm.
In 2010, Clark Hunt assumed the role of CEO in addition to his position as chairman of the board for the Kansas City Chiefs.
In 2010, the Chiefs hired Charlie Weis and Romeo Crennel as assistant coaches and secured their first AFC West title since 2003.
In mid-2010, Arrowhead Stadium underwent a $375 million renovation, including new luxury boxes, wider concourses, and enhanced amenities.
On January 9, 2011, the Chiefs lost their home Wild Card playoff game to the Baltimore Ravens 30–7. Six players were chosen for the Pro Bowl.
On January 27, 2011, Tony DiPardo died at the age of 98 after being hospitalized since December 2010 due to a brain aneurysm.
In 2011, Jon Baldwin was drafted. Todd Haley was relieved of duties as head coach on December 12.
On January 9, 2012, Romeo Crennel was named the 11th full-time head coach in Chiefs history.
Following the 2012 season, the Chiefs fired head coach Romeo Crennel and general manager Scott Pioli. Andy Reid was hired as head coach.
In 2012, the Chiefs tied their franchise-worst record of 2–14 and clinched the No. 1 overall pick in the 2013 NFL draft.
Prior to September 15, 2013, the Chiefs always wore white pants with their red jerseys.
In 2012, the Chiefs clinched the No. 1 overall pick in the 2013 NFL draft. It is the first time since the merger they have held the first overall pick.
In 2013, the Chiefs acquired quarterback Alex Smith from the San Francisco 49ers and drafted Eric Fisher with the first overall pick.
In 2013, the Chiefs started 9–0 and finished with an 11–5 record, making the playoffs. They lost their wildcard game against the Indianapolis Colts 45–44 after leading 38-10.
In 2015, the streak achieved by the Chiefs broke a franchise record for nine straight wins in 2013
In 2013, the Chiefs traded a conditional pick in the 2014 draft for Alex Smith.
In 2014, the Chiefs finished 9-7 and were eliminated from playoff contention in Week 17.
In 2015, the Chiefs achieved their longest winning streak in franchise history at ten games
Prior to the 2015 season, the practice of playing "Rock and Roll Part 2" and performing the chant was completely discontinued by the Kansas City Chiefs after Gary Glitter's re-arrest.
The Chiefs' victory on January 16, 1994 against the Oilers remained the franchise's last post-season victory for 22 years until their 30–0 victory over the Houston Texans on January 9, 2016.
In 2016, Native American groups requested that the Kansas City Chiefs stop doing the tomahawk chop and a similar request was made of Exeter Chiefs.
In 2016, the Chiefs had a 33-27 comeback win against the San Diego Chargers after being down 24-3. They also defeated the Denver Broncos on Christmas Day, marking their tenth straight win against divisional opponents.
On January 1, 2017, the Chiefs clinched the AFC West and the second seed going into the playoffs.
On June 22, 2017, the Chiefs fired general manager John Dorsey.
On July 10, 2017, Brett Veach was hired as the new general manager for the Kansas City Chiefs.
From 1993 to 2017, the Kansas City Chiefs struggled in the playoffs, losing ten of twelve games, including an eight-game losing streak.
In 2017, the Chiefs finished the season with a 10–6 record and won the AFC West for the first time in back-to-back years. However, they lost to the Tennessee Titans in the Wild Card round 22–21. Alex Smith was later traded.
On December 31, 2017, Patrick Mahomes made his NFL debut and first career start against the Denver Broncos. The Chiefs won the game 27–24, with Mahomes completing 22 of 35 passes for 284 yards and one interception.
On January 12, 2019, the Chiefs defeated the Indianapolis Colts 31–13 in the AFC Divisional round, marking their first playoff win in Arrowhead Stadium in 25 years and enabling them to host the AFC Championship Game for the first time.
In 2019, the Kansas City Chiefs played an international regular season game against the LA Chargers in Mexico City.
In late 2019, the editorial board of the Kansas City Star newspaper called for the cessation of the "Tomahawk Chop", citing opposition from Native Americans and Tribes and stating that the practice stereotypes and dehumanizes Native Americans.
Since 2019, the Kansas City Chiefs have risen to dynastic success under head coach Andy Reid, quarterback Patrick Mahomes, tight end Travis Kelce, and defensive tackle Chris Jones, appearing in five Super Bowls and winning three.
In January 2020, Business Insider journalist Meredith Cash stated that Mayor Bartle "insisted on the team being named after himself" and was known as Chief Lone Bear.
On February 2, 2020, the Chiefs played against the San Francisco 49ers in Super Bowl LIV at Hard Rock Stadium, winning 31-20. Patrick Mahomes was named Super Bowl MVP. This marked the first time in NFL postseason history that a team faced ten point deficits in three straight games and won all three by double-digit margins, ending the Chiefs' Super Bowl drought dating back to the AFL-NFL Merger.
On July 6, 2020, Patrick Mahomes signed a record ten-year, $503 million contract extension with the Chiefs, keeping him under contract until the conclusion of the 2031 season. This contract is the largest ever signed in North American sports at that time.
On December 26, 2021, the Chiefs defeated the Pittsburgh Steelers 36–10, earning the team's sixth straight AFC West title.
In 2023, after Norma Hunt's death, the Hunt children inherited her stake in the Kansas City Chiefs franchise.
In 2023, the Kansas City Chiefs played an international regular season game against the Miami Dolphins in Berlin.
According to Forbes, in 2024, the Kansas City Chiefs began the season with an estimated value of $4.85 billion USD, ranking 24th among the 32 NFL teams.
Entering the 2024 season, the Kansas City Chiefs are valued at over US$4.85 billion.
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