She holds the North American record over the 5000 m, 10,000 m, and two mile distances, all set as part of the On Athletics Club under coach Dathan Ritzenhein.

Two weeks later, she competed in the prestigious Millrose Games, contesting the 3000 m and taking the win over a field of professionals, running a personal best of 8:45.97 in the process.

In April 2020, after the University of Wisconsin's decision not to honor the additional season of eligibility granted by the NCAA due to the COVID-19 pandemic, Monson decided to turn professional.

[4] In August, Monson joined the newly formed On Athletics Club, based in Boulder, and coached by 3-time US Olympian Dathan Ritzenhein.

Such was the effort, after the medal ceremony, she collapsed and started vomiting and had to go to the hospital as a precaution, according to her coach, Dathan Ritzenhein.

In January 2022, Monson won the USATF Cross Country Championships held in San Diego, California.

On June 16, Monson finished fifth at the Bislett Games 5000 m, running a lifetime best of 14:31.11, becoming the third fastest American of all time over the distance.

[1][7] On February 11, Monson set a new North American indoor record in the 3000 meters with a time of 8:25.05 at the Millrose Games in New York, improving her lifetime best by more than six seconds.

[1][8] On March 4, Monson smashed Molly Huddle's North American 10,000 m record of 30:13.17 set in 2016 with a time of 30:03.82 at the Sound Running The TEN in San Juan Capistrano.

[12] On March 16, Monson competed in the TEN in San Juan Capistrano, aiming to break her own American 10,000 m record set the previous year.

[13] She stayed with the pace for just the first few kilometers, before fading and eventually dropping out of the race, later citing stomach issues as her reason for doing so.