MileSplit Staff Mar 04, 2026 PRO See the rest of this article Access the complete article with MileSplit PRO. Subscribe to keep reading Already a subscriber? Log in. 2026 Improvement Rankings: Highlighting the top Girls 400m performers from California compared to their season 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 -18.70 Niirayah Vaughn Colony (SS) 2028 1:25.99 1:07.29 2 -11.05 Skyler Belay Canyon - Canyon Country (SS) 2028 1:27.35 1:16.30 3 -10.52 Aylin Soroa Canyon - Canyon Country (SS) 2028 1:22.01 1:11.49 4 -10.47 Jah'niece Morgan Rodriguez (Angelo) (SJ) 2028 1:19.28 1:08.81 5 -10.06 Larissa Serrano Rodriguez (Angelo) (SJ) 2029 1:25.26 1:15.20 ...