Most Improved California Boys 400m Marks Compared to 2025

MileSplit Staff
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Improvement Rankings: Highlighting the top California Boys 400m performers this Outdoor Season compared their best results from 2025.

Most Improved - 400 Meter Dash

Comparing 2026 season to 2025 season

Rank Improved Athlete/Team Class 2025 PR 2026 PR
1 -14.95 2026 1:06.38 51.43
2 -12.71 2026 1:12.66 59.95
3 -10.06 2028 1:09.99 59.93
4 -9.40 2027 1:10.17 1:00.77
5 -9.27 2026 1:02.32 53.05
6 -9.06