Personal bests
Best marks in available results| Event / course | Mark | Meet | Date |
| 2607 m · Darien High SchoolMcMahon, Ludlowe, Ridgefield at Darien · Oct 13 | 16:22.3 | McMahon, Ludlowe, Ridgefield at Darien | October 13, 2026 |
| 3,000 Meters · Staples High SchoolDanbury, St. Joseph, McMahon at Staples · Sep 29 | 18:46.18 | Danbury, St. Joseph, McMahon at Staples | September 29, 2026 |
| 3,000 Meters · Waveny ParkCentral, Westhill, McMahon at New Canaan · Oct 6 | 18:07.94 | Central, Westhill, McMahon at New Canaan | October 6, 2026 |
Best marks from the meets included here. Cross Country bests are grouped by course and distance.
2026 Cross Country
4 results| Date | Meet | Event | Pl | Mark | Gr |
| Oct 21 | FCIAC Cross Country ChampionshipsOct 21 · 5,000 Meters Junior Varsity · Place 180 · Brien McMahon | 5,000 Meters Junior Varsity | 180 | 33:48.5 | 12 |
| Oct 13 | McMahon, Ludlowe, Ridgefield at DarienOct 13 · 1.62 Miles Novice · Place 57 · Brien McMahon | 1.62 Miles Novice | 57 | 16:22.3 PB | 12 |
| Oct 6 | Central, Westhill, McMahon at New CanaanOct 6 · 3,000 Meters Novice · Place 16 · Brien McMahon | 3,000 Meters Novice | 16 | 18:07.94 PB | 12 |
| Sep 29 | Danbury, St. Joseph, McMahon at StaplesSep 29 · 3,000 Meters Novice · Place 40 · Brien McMahon | 3,000 Meters Novice | 40 | 18:46.18 PB | 12 |
2025 Cross Country
3 results2024 Cross Country
4 results| Date | Meet | Event | Pl | Mark | Gr |
| Oct 8 | McMahon, Stamford, Greenwich at St. Joe'sOct 8 · 3,000 Meters Varsity · Place 13 · Brien McMahon | 3,000 Meters Varsity | 13 | 18:22 | 10 |
| Oct 1 | Warde, McMahon, Staples at New CanaanOct 1 · 3,000 Meters Varsity · Place 39 · Brien McMahon | 3,000 Meters Varsity | 39 | 15:47.05 | 10 |
| Sep 24 | Ludlowe, McMahon, Central at TrumbullSep 24 · 1.7 Miles Varsity · Place 35 · Brien McMahon | 1.7 Miles Varsity | 35 | 15:46.91 | 10 |
| Sep 17 | Westhill, McMahon, Norwalk at DarienSep 17 · 1.62 Miles Varsity · Place 48 · Brien McMahon | 1.62 Miles Varsity | 48 | 15:17.00 | 10 |