Most Improved Colorado Boys 400m Marks Compared to 2025

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Improvement Rankings: Top Colorado Boys 400m marks compared to their season’s best performances from 2025.

Most Improved - 400 Meter Dash

Comparing 2026 season to 2025 season

Rank Improved Athlete/Team Class 2025 PR 2026 PR
1 -9.63 2028 1:05.59 55.96
2 -9.25 2028 1:09.78 1:00.52
3 -7.91 2028 1:11.32 1:03.41
4 -7.71 2028 1:10.54 1:02.83
5 -7.52 2028 1:02.59 55.07
6 -6.42 ...