With four races remaining in the NASCAR Cup Series regular season, Iowa Speedway will kick off the 2025 NASCAR on NBC schedule. Ryan Blaney is the defending winner of Sunday’s Cup race (Countdown to Green begins at 3 p.m. ET on USA Network).

Last year, NASCAR announced that it would hold a Cup Series race at Iowa Speedway after the sanctioning body decided to remodel Auto Club Speedway in Fontana, California, and needed a track to fill a hole in the schedule. Since then, Iowa Speedway has become one of NASCAR's favorite tracks.

After making history last year with its inaugural cup race, NASCAR returns this week to the Iowa Speedway. But before the green flag drops, here are four things you should know ahead of the IOWA CORN 350.