Adam Jecho was born in Zlin, Czechia. In 2021-2022, Jecho played for the Tappara U18 team and tallied 16 goals and 20 assists in 43 games. He also played in the Hlinka Gretzky Cup and had one assist in four games.
In 2022-2023, Jecho improved on his numbers for Tappara U18. He recorded 21 goals and 26 assists in 37 games. He was drafted third overall in the WHL's 2023 Import Draft.
In his first season in the WHL, Jecho had a solid season, tallying 23 goals and 24 assists in 54 games.