;2015 On March 15, 2015, Hall made her marathon debut at the
Los Angeles Marathon and battled through cramps, finishing 22nd with a time of 2:48:02 (6:25 minutes/mile). On March 28, 2015, Hall led the USA Team with 20th place
2015 IAAF World Cross Country Championships – Senior women's race after placing 5th at the 2015
USA Cross Country Championships in Boulder. Hall finished 10th at
2015 Chicago marathon in 2:31:14, running an
Olympic Standard time. ;2016 Hall improved her marathon best with 2:30:06 on April 24, 2016, finishing 12th at the
2016 London Marathon. ;2017 On February 26, 2017, Hall again improved her marathon best with a 2:28:26 sixth-place performance at the
2017 Tokyo Marathon. On October 1, 2017, Hall won the Women's US 10-mile road championship in the
Twin Cities, in 53:43, 2 seconds ahead of
Natosha Rogers. She narrowly lost the equalizer competition male winner
Shadrack Kipchirchir. Still, later, it was discovered the women were supposed to be given a 6:18 lead while they were given 6:10, so both runners were given the $10,000. On October 29, 2017, Hall again improved her marathon best with a 2:27:21 fifth-place performance at the 2017 Mainova Frankfurt Marathon. On December 3, 2017, Hall won the Women's U.S. Marathon in
California at
2017 California International Marathon in 2:28:10. ;2018 On May 27, Hall was third in the 2018
Ottawa Marathon in 2:26:19. In July 2018, she placed 3rd at the Women's US 10 km road championship at the
Peachtree 10K in 32:41. On September 3, 2018, she won the Women's US 20 km road championship at
Faxon Law New Haven Road Race 20 km in
New Haven, Connecticut in 1:09:04. On October 7, 2018, Hall won the Women's US 10-mile road championship in the
Twin Cities in 52:47, repeating her 2017 victory and edging out
Molly Huddle by 1 second. ;2019 On September 29, 2019, Hall finished fifth in the
Berlin Marathon, finishing in a personal best time of 2:22:16. Just one week later, on October 6, 2019, she won the USATF 10-mile championships for the third time in a row in a time of 53:11. ;2020 On October 4, 2020, Hall finished 2nd in 2:22:01 at the
2020 London Marathon behind
Brigid Kosgei. On December 20, 2020, Hall finished first at the Marathon Project in a personal best 2:20:32 in
Chandler, Arizona, running with male pacers with the goal of breaking the US record, missing
Deena Kastor's 2:19:36 record by just under one minute. ;2021 On October 10, 2021, Hall finished third at the
Chicago Marathon with a time of 2:27:19. ;2022 On January 16, 2022, Hall broke the American record in the
half marathon at the
Houston Half Marathon, finishing in 1:07:15 to lower the previous American record set by
Molly Huddle in 2018 by ten seconds. On March 6, 2022, Hall finished eighth at the
2021 Tokyo Marathon with a time of 2:22:56. On July 18, 2022, Hall finished fifth at
2022 World Athletics Championships in the marathon with a time of 2:22:10. ;2023 On April 17, 2023, Hall finished seventeenth at the
2023 Boston Marathon with a record master's time of 2:25:48 (2 days after her 40th birthday.). ;2024 On February 3, 2024, Hall finished fifth at the
2024 United States Olympic trials (marathon) with an American master's record time of 2:26:06. On April 15, 2024, Hall ran the
2024 Boston Marathon, finishing in 2:27:58 the second American woman finisher, and 15th overall. On December 1, 2024, Hall ran the 2024
Valencia Marathon, finishing in 2:23:45, with a 10th overall finish, breaking her own American master’s record set earlier in the year. ;2025 On April 21, 2025, Hall ran the
2025 Boston Marathon, finishing in 2:26:32 for 18th overall. On December 7, 2025, Hall ran the
California International Marathon in 2:24:38 finishing second. ;2026 On January 11, 2026 Hall finished second in the
Houston Marathon with a time of 2:26:26. ==Personal life==