In January, Brown finished sixth at the 2018 U.S. Championships, after placing third in the short program and sixth in the free skate. U.S. Figure Skating named him as first alternate for the 2018 Winter Olympics. He was assigned to the 2018 Four Continents Championships in Taipei, Taiwan. Ranked fourth in the short and third in the free, he won the bronze medal, achieving his first podium finish at a senior-level ISU Championship. After Adam Rippon withdrew from the 2018 World Championships, Brown, who was first alternate, declined U.S. Figure Skating's invitation and it was transferred to Max Aaron.