As of March 8, 2025, there is no public information indicating that Denver Broncos quarterback Bo Nix has signed a three-year, $51 million contract with $34 million guaranteed. Such a contract would be highly unusual, considering Nix’s status as a recent rookie. In May 2024, Nix signed a four-year rookie contract worth $18.6 million, fully guaranteed, with the Broncos.
Bo Nix, born on February 25, 2000, in Arkadelphia, Arkansas, had a distinguished college career before entering the NFL. He played for the Auburn Tigers from 2019 to 2021 and later transferred to the Oregon Ducks, where he played from 2022 to 2023. Over his collegiate career, Nix set a record for the most starts by a quarterback in NCAA history, with 61 games. In his final season at Oregon, he passed for over 4,500 yards and 45 touchdowns, earning the William V. Campbell Trophy and the Pac-12 Offensive Player of the Year honors.

The Denver Broncos selected Nix with the 12th overall pick in the 2024 NFL Draft. He became the first rookie quarterback to start a season opener for the Broncos since John Elway in 1983. Throughout his rookie season, Nix showed promise, leading the team to multiple victories and earning AFC Offensive Player of the Week honors.
Given Nix’s recent entry into the NFL and his current contract, it is unlikely that he would agree to a new contract of the magnitude described in your query. For the most accurate and up-to-date information on Bo Nix’s contract status, I recommend checking official announcements from the Denver Broncos and reputable sports news outlets.