Hoffman's time with the Colorado Rockies marked a significant downturn in his career, as he struggled with injuries and ineffectiveness after initially showing promise. Drafted by the Toronto Blue Jays and later traded to Colorado, he made his MLB debut in 2016 and had a solid season in 2017. However, he faced challenges in subsequent years, which he attributes to a confusing mix of mechanical instruction that hindered his development. His experience with the Rockies ultimately contributed to his struggles before he found success with the Phillies by refining his approach and rediscovering his pitching mechanics.