Fans walk through the garage area as it rains prior to the NASCAR Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 28, 2023 in Concord, North Carolina. (Photo by Jared C. Tilton/Getty Images)

By Reid Spencer 

NASCAR Wire Service

CONCORD, N.C.—For the second straight day, rain played havoc with on-track NASCAR action at Charlotte Motor Speedway.

The Toyota Track Drying Team works to dry the track prior to the NASCAR Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 28, 2023 in Concord, North Carolina. (Photo by Jared C. Tilton/Getty Images)

A day-long drizzle forced postponement of Sunday night’s Coca-Cola 600 NASCAR Cup Series race until Monday afternoon at 3 p.m. ET on FOX, PRN and SiriusXM NASCAR Radio to be run as a doubleheader with the Alsco Uniforms 300 NASCAR Xfinity Series event. The Xfinity race was postponed from Saturday due to weather and will start at 11 a.m. ET, to be broadcast live on FS1, PRN and SiriusXM NASCAR Radio.

Gates at the speedway will open at 9 a.m. ET. Xfinity-only ticket holders must leave between races due to the sellout of the grandstand seats for the Coca-Cola 600.

A detailed view of Goodyear Eagle tires are seen in the garage area as it rains prior to the NASCAR Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 28, 2023 in Concord, North Carolina. (Photo by Jared C. Tilton/Getty Images)

With the starting order for the Coca-Cola 600 canceled because of rain and set by metrics according to the rule book, William Byron will take the green flag from the pole position, with Kevin Harvick beside him on the outside of the front row. 

Justin Allgaier won the pole for the Alsco Uniforms 300 during time trials on Friday.