In week 12 of the 2020 season, Grimm hauled in four passes for 72 yards and two touchdowns in a loss to TCU.[4] He finished his first season in 2020 with 19 receptions for 255 yards and two touchdowns.[5] In week 8 of the 2021 season, Grimm brought in three passes for 50 yards and a touchdown in a 35–23 loss to No. 3 Oklahoma.[6] He finished the season with 22 receptions for 349 yards and three touchdowns.[5] In week 6 of the 2022 season, Grimm racked up six receptions for 73 yards and a touchdown in a 38–31 loss to TCU.[7] In the 2022 Liberty Bowl, he hauled in ten receptions for 167 yards and a touchdown in a triple overtime loss to Arkansas.[8] Grimm finished his 2022 season with 52 receptions for 623 yards and six touchdowns.[5]
Grimm signed with the Los Angeles Chargers as an undrafted free agent on April 26, 2025.[11] On August 26, Grimm was waived and re-signed to the practice squad five days later.[12][13] He signed a reserve/futures contract with Los Angeles on January 13, 2026.[14]
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