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Byron Wins Iowa Cup as New Late-Caution Rule Takes Effect

8/9/2026

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Summary

Story summary

NASCAR will use a new rule at the Iowa Corn 350: a caution with ten or fewer laps ends the stage and gives the leader the green-white-checkered flag.
William Byron will start 19th and is 12th in points with 568, 88 points above the Chase cut line.
Byron won the 2024 Iowa Cup on fuel mileage despite a 22-race winless streak.

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Story summary

NASCAR will use a new rule at the Iowa Corn 350: a caution with ten or fewer laps ends the stage and gives the leader the green-white-checkered flag.
William Byron will start 19th and is 12th in points with 568, 88 points above the Chase cut line.
Byron won the 2024 Iowa Cup on fuel mileage despite a 22-race winless streak.