The 600-mile NASCAR Cup race was originally scheduled to go green at 6:21 p.m. ET and cap a day of giant motorsports events following the Formula 1 race at Monaco and the Indianapolis 500.
Max Verstappen claimed victory after leading every lap at Monaco while Josef Newgarden prevailed over Marcus Ericsson in a one-lap dash to decide the winner of the 107th running of the Indy 500.
But in Charlotte, a slow-moving weather system produced light to moderate rain all day Sunday although NASCAR and track officials were still hoping for a window of opportunity to get the race under way on Sunday night.
Saturday’s 300-mile Xfinity Series race has already been postponed until Noon ET Monday and broadcast live on Fox Sports 1.
Should Sunday’s 600 need to be postponed, both races will be run on Monday and the time of the Xfinity race will likely be moved up.
With Cup qualifying also rained out on Saturday, the lineup for the 600 was set based on NASCAR’s performance metric.
William Byron, who won the series’ most recent points-paying race two weeks ago at Darlington, S.C., had the lowest metric score and will start on the pole.
Joining Byron on the front row will be Kevin Harvick with Brad Keselowski, Denny Hamlin and Kyle Busch rounding out the top five.
Completing the top-10 starters are Chase Elliott, Bubba Wallace, Ryan Blaney, Christopher Bell and Ricky Stenhouse Jr.
Kyle Larson, who won last weekend’s All-Star Race at North Wilkesboro (N.C.) Speedway, will line up 12th. Larson was in attendance Sunday for the start of the Indy 500, which he will compete in next season.
The weather forecast for Monday currently calls for cloudy conditions with a high near 70 and 25 percent chance of a rain shower.