[5] Hanna and Ashley were born in Lake Charles, Louisiana, United States, to Antonio and Mathilda Pérez (née Mosa).

They took courses in tap, jazz, ballet, hip hop, gymnastics, acting, theater and body language and also they studied piano and guitar.

[6] Because their father worked outside the United States, Hanna and Ashley spent half of each year in Mexico City and half in Lake Charles, living at times, 6 months of the year in each city,[6][10] since they were little her father and grandfather taught them to speak Spanish, perfecting it in the modern American school where he studied in Mexico.

[12] Although reticent concerning their private lives, Ha*Ash have mentioned the divorce of their parents, who separated in early 2005, while the sisters were recording their second album Mundos Opuestos.

[29][30] Ha*Ash appeared on the soundtrack to the Mexican animated film Magos y Gigantes, contributing the song "Un Amigo Así".

[50][41] In 2008 they worked on film projects such as the Spanish versions of MGM's Igor,[51] and recorded the song "Cree y Atrévete" for the soundtrack to Disney's Tinker Bell.

[53] They performed for the first time in Spain on July 5, 2009, in the small town of Barbera del Valles, promoted by that municipality and Cadena Dial.

[32]Ha*Ash embarked on a lengthy world tour from 2011 to 2013,[62] visiting Mexico, the United States, Spain, Costa Rica, Peru, and Ecuador.

[65] In late 2011 they appeared on the Hombres G tribute album En la playa, recording a new version of "Temblando" with David Summers.

[71] At the end of the A Tiempo tour, Ha*Ash began the production of their first live album, Primera Fila: Hecho Realidad, which was released in 2014.

[26][76] Ha*Ash worked with producers George Noriega, Pablo De La Loza, and Tim Mitchell.

[78][79] They started their own Primera Fila Tour in 2015, visiting Argentina, Costa Rica, Chile, Dominican Republic, Ecuador, El Salvador, Guatemala, Mexico, Peru, Spain, Uruguay, and Venezuela.

[80] In November 2015, after the success of Primera Fila: Hecho Realidad, a special edition of the album was released with three new tracks, music videos, and a documentary about the tour.

[83] Additionally, they worked on film projects such as the Spanish version of Sing: Ven y Canta!,[84] with Ashley Grace recording the song "Al Fin" for the soundtrack.

[87] During the Primera Fila Tour, Ha*Ash played in Puerto Rico for the first time,[88] and in November 2016 they made their first appearance at the Palacio de los Deportes in Mexico City.

[90] In December 2017, Ha*Ash released the album 30 de Febrero,[91] featuring Prince Royce and Abraham Mateo on the title track.

[92] Ha*Ash co-produced the album in collaboration with producers George Noriega, Matt Rad, Joe London, and Edgar Barrera.

[41][107] In October 2018, Ha*Ash became the first Latin group to be featured in the Spotify Singles song series, releasing a new version of "No Pasa Nada" and a cover of "Adiós Amor".

[108] In November 2018, Ha*Ash won the Best Latin America North Act at the 2018 MTV Europe Music Awards.

[112] Ha*Ash performed the American national anthem for Monday Night Football at the Estadio Azteca in Mexico City on November 18, 2019.

[113] The following month, the group released the live album/video Ha*Ash: En Vivo, which included 22 songs recorded at the Auditorio Nacional in Mexico City in 2018.

[120] In April 2020, they took part in the Together at Home benefit event[121] and participated in the charity single "Resistiré México",[122] with proceeds donated to Mexican hospital relief efforts.

[134] In April 27, it was announced they Ha*Ash would be part to TV Azteca, as coaches the program La Voz... México alongside David Bisbal, Yuridia and Joss Favela.

[136] The music video features the band singing the song while scenes show Ha*Ash with a little girl played by Mathilda, the daughter of Hanna.

[142] In November, Ha*Ash has officially released the musical video of "Tenían Razón"[143] and appeared on the Arthur Hanlon album Piano y Mujer II.

[152] In 2016, Ha*Ash organized the charity drive "Barriga llena, corazón contento" to deliver food to the homeless,[153] and were recognized as "Agents of Change" by the Nickelodeon Mexico.

[153][154] In September 2017, they participated in the concert to benefit the victims of Hurricane Harvey in Louisiana and Texas, organized by the Michael & Susan Dell Foundation.

[155] During a 2018 appearance in Torreón they donated proceeds to the cancer treatment foundation Sonríe… Solo tienes cáncer,[156] and visited local children suffering from the illness.

[163] The band's later albums, such as A Tiempo, 30 de Febrero, Haashtag, included more of a new wave and synth-pop sound, with urban, electropop and mariachi elements.

[57][59][58][134] Ha*Ash has expressed appreciation for Shania Twain,[164] Loretta Lynn,[165] Nat King Cole,[165] Garth Brooks,[166] the Chicks[166] and Patsy Cline.