While the Mercedes-powered FW41 isn't expected to be revealed fully before testing, Williams will officially launch their season at the event on February 15, a full 11 days ahead of the first test at Barcelona, Spain.
Williams finished a disappointing fifth in the 2017 standings, over 100 points behind fourth-place rivals Force India, and the team hope the new car can boost their fortunes.
The FW41, the first new Williams since technical chief Paddy Lowe rejoined the team last March, will be raced by Lance Stroll and rookie Sergey Sirotkin, the youngest driver pairing on the 2018 grid.
The pair will be joined at the season launch by new reserve and development driver Robert Kubica, who at 33 is bidding to complete what would be a remarkable comeback from life-threatening injuries suffered in a rally crash in February 2011.
Confirmed 2018 launch dates:
Williams - February 15
Mercedes - February 22
Ferrari - February 22
McLaren - February 23