The singer will release her first studio collection on April 8, after winning the BBC One singing contest last May.
"To answer your questions, my single 'If I Knew Then' is out end of Feb/Mar, and the album is 8th April! really excited to finally show you!x" Mitchell tweeted.
It's expected Mitchell will perform on the second series of The Voice UK when it returns later this year.
The star recently said that the chart performance of her winning track 'Run to You' - which peaked at number 45 - hasn't knocked her confidence.
"It hasn't bothered me, but the main thing I wanted to work on is my album. So hopefully people will get to hear that very soon," she said.
Watch the music video for Leanne Mitchell's 'Run to You' below: