After negotiations with both the Tampa Bay Buccaneers and New York Jets, the Packers traded Favre to the Jets on August 7, 2008, in exchange for a conditional fourth-round pick in the 2009 NFL Draft with performance escalation.

In his Jets debut, Favre passed for 194 yards and two touchdowns in a 20–14 victory over the Miami Dolphins.
 In Week 4, he threw six touchdowns against the Arizona Cardinals, a personal best and one shy of the NFL record.
This performance led to him being selected as the FedEx Air Player of the Week.
By Week 12, the Jets had compiled an 8–3 record, including a 34–13 win over the previously undefeated Tennessee Titans.
However, the Jets lost four of the last five games of the season, including the final game against the Miami Dolphins, who had acquired quarterback Chad Pennington after he was released from the Jets to make room for Favre.
In those five games, Favre threw eight interceptions and only two touchdown passes, bringing his season total to 22 of each.
Favre had complained of shoulder pain and had an MRI performed on December 29, 2008, which revealed a torn biceps tendon in his right shoulder.
After the 2008 season had ended, in mid January 2009, Favre told Jets General Manager Mike Tannenbaum, "it may be time to look in a different direction" regarding the quarterback position.
On February 11, 2009, Favre informed the Jets that he was retiring after 18 seasons.
He remained part of the Jets organization until April 28, 2009, when the Jets released Favre from his contract, thus allowing him to sign anywhere he wanted.
By May 2009, he was officially cut from the Jets Reserve/Retired list.
In September 2009, Favre again made Jets news, as the NFL learned that the Jets were aware that Favre injured his arm in the 11th game of the 2008 season, and fined the Jets $125,000 for not reporting the injury in any of the Jets' five final games.
After negotiations with both the Tampa Bay Buccaneers and New York Jets, the Packers traded Favre to the Jets on August 7, 2008, in exchange for a conditional fourth-round pick in the 2009 NFL Draft with performance escalation.
In his Jets debut, Favre passed for 194 yards and two touchdowns in a 20–14 victory over the Miami Dolphins.  In Week 4, he threw six touchdowns against the Arizona Cardinals, a personal best and one shy of the NFL record. This performance led to him being selected as the FedEx Air Player of the Week. By Week 12, the Jets had compiled an 8–3 record, including a 34–13 win over the previously undefeated Tennessee Titans. However, the Jets lost four of the last five games of the season, including the final game against the Miami Dolphins, who had acquired quarterback Chad Pennington after he was released from the Jets to make room for Favre. In those five games, Favre threw eight interceptions and only two touchdown passes, bringing his season total to 22 of each. Favre had complained of shoulder pain and had an MRI performed on December 29, 2008, which revealed a torn biceps tendon in his right shoulder. After the 2008 season had ended, in mid January 2009, Favre told Jets General Manager Mike Tannenbaum, "it may be time to look in a different direction" regarding the quarterback position. On February 11, 2009, Favre informed the Jets that he was retiring after 18 seasons. He remained part of the Jets organization until April 28, 2009, when the Jets released Favre from his contract, thus allowing him to sign anywhere he wanted. By May 2009, he was officially cut from the Jets Reserve/Retired list. In September 2009, Favre again made Jets news, as the NFL learned that the Jets were aware that Favre injured his arm in the 11th game of the 2008 season, and fined the Jets $125,000 for not reporting the injury in any of the Jets' five final games.
Brett Favre