Gromova was born to working-class family on 3 January 1925 in the village of Pervomaysky in what is now Luhansk Province of the Ukraine. Gromova's father, Matthew Maximovich Gromov, was born in 1880 in Poltava Province of Ukraine, then part of the Russian Empire. Gromova's father served in the Russo-Japanese War of 1904-1905, then moved to Krasnodon and worked as mineworker, retiring in 1937. Gromova's mother was housewife; the family had five children, Ulyana being the youngest. In March 1940 Ulyana Gromova joined the Komsomol. At the German invasion of the Soviet Union in 1941, Gromova was 17 years old and in tenth grade. Like many of her classmates, she worked in agriculture to replace farm workers and took care of wounded soldiers in the hospital. She was graduated from high school with good to excellent marks on 3 June 1942.
Resistance, arrest, and execution
When her home province was occupied by German troops, which began on 17 July 1942, Gromova was not able to evacuate because she needed to care for her sick mother. Together with Maya Peglivanovoy and Anatoly Popov, she organized a group of patriotic young people in her village of Pervomaysky who became part of the "Young Guard" of the underground resistance Komsolol organization in September 1942. In October 1942, Gromova was elected a member of staff of the organization. She took an active part in the preparations for armed resistance, the creation and dissemination of anti-fascist leaflets, collecting medicines, and campaigning among the population, urging them to not obey the enemy and to disrupt plans to supply the Germans with material and impress Soviet youth to work in Germany. On the night of November 7, 1942, Gromova and Popov hoisted the red flag on a pipe shaft at Mine Number 1 in occupied Krasnodon. Mass arrest of suspected underground figures began in the city, and the Young Guards developed an escape plan for Gromova, but she was arrested by the German authorities on 10 January 1943. She was severely beaten and tortured during interrogation, but she stayed true to her oath to her motherland and comrades and did not reveal details of the underground's activities. She was hung by her hair, burned with hot irons, had a five-pointed star cut into her back and the wound rubbed with salt, and suffered a broken arm and broken ribs. She endured her suffering stoically, and even cheered her imprisoned comrades by reciting Lermontov's epic poem Demon, which she knew by heart. Even in the note which she managed to pass secretly to her relatives, knowing her death was near, she expressed faith in victory and called for her brother Elisha to stand firmly for his homeland. On 16 January 1943 Gromova, along with other Young Guards, was executed, and her body thrown in the 58-meter pit of Mine Number 5 in Krasnodon. After the liberation of Krasnodon, Gromova was buried with military honors on 1 March 1943 in a mass grave of patriotic heroes in the central square of Krasnodon, where a memorial to the Young Guards was erected.
Gromova is a character in Alexander Fadeyev's 1946 novel The Young Guard, which was included in school curriculums. In the 1948 film The Young Guard based on Fadeyev's novel, Gromova is played by Nonna Mordyukova in her film debut. In many cities of the former Soviet Union, there are streets named for Gromova and memorials to her. For instance, in Nizhny Tagil is Ulyana Gromova Street, likewise in Kaliningrad a busy street is named for her, and Tolyatti has a memorial to her. On 1 July 1986 the vessel "Ulyana Gromova" was launched in Peleduy, a town of the Sakha Republic.