Hima Das was born at Kandhulimari village, near the town of Dhing in her home state of Assam to Ronjit Das and Jonali Das.[8] Her parents are farmers by profession. She is the youngest of five siblings.[11] She completed early education from Dhing Public High School. She used to play football and had always wanted to pursue a career in football. However, she did not see any prospects for herself in the women's football in India.
At one of the inter-school camps held at the nearby Jawahar Navodaya Vidyalaya (JNV), she would arrive at the ground before practise began, and sometimes even before the gates were opened.The physical education teacher
At the 2018 Asian Games, Das qualified for the 400 m final, after clocking 51.00 in heat 1 and setting a new Indian national record.[16] On 26 August 2018 she improved the national record to 50.79 s in the 400 m final however she could win only the silver medal.[17] Later on 30 August 2018, she, along with M. R. Poovamma, Sarita Gayakwad and V. K. Vismaya won the women's 4 × 400 metres relay clocking 3:28.72. Hima also won a gold medal in the 4 × 400 m mixed relay, which was held for the first time at Asian Games.[18]
Das continued her success in 2019 winning the 200m gold in Poznan Grand Prix in Poland, on 2 July 2019, with a time of 23.65 seconds.[19][20]
On 13 July, she won the 200m at the Kladno Meet in the Czech Republic with a time of 23.43 seconds.[21][22]
On 20 July 2019, she achieved her third win in a month, and fifth win, in the 400-meters in Nové Město, Czech Republic in a time of 52.09 seconds.[23]
She was named for the World Championships to be held at Doha in October 2019. However a month before, she was ruled out of participation due to a back problem, that had started right after she competed at the Asian games the previous year.[24]