The clock started ticking for the $1.35 billion jackpot winner when the six winning Mega Millions numbers were selected on Friday night.
According to the Mega Millions website, depending on local rules, the reward can be claimed between 90 days and a year following the draw.
If the jackpot isn't won by the deadline, every state that participates in the lottery gets its money back.
The jackpot can be paid out in yearly instalments via annuity or cash, depending on the winning player's preference.
According to tweets from California lottery officials, the winning ticket was acquired at a service centre in the Los Angeles County community of Altadena.
The most recent Mega Millions win, worth $1.348 billion with a $723.5 million cash option, is the second-highest in the history of the lottery.
A ticket bought at a gas station in Lebanon resulted in the first top prize to be won in Maine.
Lottery winners are advised by the Maine State Lottery to sign their winning tickets and store them safely until they may claim them.