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Runner Profile
Thaddaeus Flatz-Ehrfeld
Groton / All-time PR 17:14.85
Course-adjusted PR 17:42.13
Adjusted-best source course
Nov 1, 2024
Rankings use the course-adjusted PR, not the raw race time.
Progress graph
Results over time
Each season gets its own line. Hover a dot for the race name and click it to open the race page.
2023
2024
2025
2026Latest
Race History
Most recent results first
Showing every imported race for this runner.
| Date | Race | Course | Raw / Adj. | Place |
|---|---|---|---|---|
| Sep 19, 2026 | Brooks, Groton, St. George's, Marianapolis at Roxbury LatinSep 19, 2026 · Place 6 | RL 5K Course | Raw 19:19.00Adj. 18:31.26 | 6 |
| Nov 8, 2025 | NEPSTA Division II ChampionshipNov 8, 2025 · Place 22 | Williston Northampton School 5K | Raw 18:10.00Adj. 17:48.00 | 22 |
| Oct 31, 2025 | Independent School League (ISL) ChampionshipOct 31, 2025 · Place 28 | Wrentham Championship 5K | Raw 17:43.58Adj. 18:11.62 | 28 |
| Oct 18, 2025 | Tabor vs. Groton vs. St. Mark'sOct 18, 2025 · Place 5 | Washington Park 5K Course | Raw 18:11.00Adj. 18:25.89 | 5 |
| Oct 4, 2025 | Brooks vs. Rivers, Groton, TaborOct 4, 2025 · Place 5 | Brooks School 5K | Raw 19:34.00Adj. 19:07.96 | 5 |
| Sep 27, 2025 | Groton, St. Sebastian's, Rivers, Roxbury LatinSep 27, 2025 · Place 16 | RL 5K Course | Raw 20:28.00Adj. 19:37.42 | 16 |
| Sep 20, 2025 | Governor's vs Brooks vs Groton (JV)Sep 20, 2025 · Place 3 | Governor's 5K Course | Raw 19:03.00Adj. 18:34.78 | 3 |
| Nov 9, 2024 | NEPSTA Division II ChampionshipNov 9, 2024 · Place 35 | Brooks School 5K | Raw 19:02.00Adj. 18:36.67 | 35 |
| Nov 1, 2024 | Independent School League (ISL) ChampionshipNov 1, 2024 · Place 20 | Wrentham Championship 5K | Raw 17:14.85Adj. 17:42.13 | 20 |
| Oct 26, 2024 | Boys XC at NoblesOct 26, 2024 · Place 23 | Noble and Greenough School 5K | Raw 20:17.00Adj. 19:26.08 | 23 |
| Oct 19, 2024 | Groton hosting BrooksOct 19, 2024 · Place 4 | Groton School | Raw 18:23.00Adj. 18:37.04 | 4 |
| Oct 11, 2024 | Middlesex School Cross Country - Varsity BoysOct 11, 2024 · Place 16 | Middlesex 5K Course | Raw 19:06.00Adj. 18:45.06 | 16 |
| Oct 5, 2024 | Brooks vs. Groton, St. Mark's, St. Sebastian'sOct 5, 2024 · Place 7 | Brooks School 5K | Raw 19:48.00Adj. 19:21.65 | 7 |
| Sep 28, 2024 | Governor's vs. Groton, Milton Academy, Tabor, BrooksSep 28, 2024 · Place 14 | Governor's 5K Course | Raw 19:30.00Adj. 19:01.11 | 14 |
| Sep 21, 2024 | Groton vs. BB&N vs. Rivers vs. ThayerSep 21, 2024 · Place 14 | Groton School | Raw 18:54.00Adj. 19:08.43 | 14 |
| Nov 11, 2023 | NEPSTA Division II Championship (JV)Nov 11, 2023 · Place 25 | RL 5K Course | Raw 20:33.00Adj. 19:42.22 | 25 |
| Nov 3, 2023 | Independent School League (ISL) Championship (JV)Nov 3, 2023 · Place 34 | Wrentham Championship 5K | Raw 19:24.00Adj. 19:54.69 | 34 |
| Oct 28, 2023 | Rivers, Tabor, Thayer at GrotonOct 28, 2023 · Place 24 | Groton School | Raw 20:14.00Adj. 20:29.45 | 24 |
| Oct 21, 2023 | Groton, Nobles, Latin at BB&N (JV)Oct 21, 2023 · Place 18 | BB&N 5K Course | Raw 19:29.00Adj. 20:27.79 | 18 |
| Oct 13, 2023 | Middlesex at GrotonOct 13, 2023 · Place 15 | Groton School | Raw 20:36.00Adj. 20:51.73 | 15 |
| Oct 7, 2023 | Brooks, Groton, Lawrence at St. George'sOct 7, 2023 · Place 21 | St. Georges 5K | Raw 21:36.00Adj. 21:14.66 | 21 |
| Sep 23, 2023 | Groton at BH (JV)Sep 23, 2023 · Place 13 | Rock Meadow 5K | Raw 22:13.00Adj. 21:52.39 | 13 |
| Sep 15, 2023 | SPS, Sebs at GrotonSep 15, 2023 · Place 29 | Groton School | Raw 21:21.00Adj. 21:37.30 | 29 |