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Runner Profile
Henry Sielheimer
Groton / Current / projected PR 18:41.00
Course-adjusted PR 18:53.83
Adjusted-best source course
Oct 25, 2025
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
2025Latest
Race History
Most recent results first
Showing past results before the 2026 season begins.
| Date | Race | Course | Raw / Adj. | Place |
|---|---|---|---|---|
| Nov 8, 2025 | NEPSTA Division II ChampionshipNov 8, 2025 · Place 85 | Williston Northampton School 5K | Raw 20:28.00Adj. 20:01.69 | 85 |
| Oct 31, 2025 | Independent School League (ISL) ChampionshipOct 31, 2025 · Place 70 | Wrentham Championship 5K | Raw 19:00.30Adj. 19:28.88 | 70 |
| Oct 25, 2025 | Groton vs. St. George'sOct 25, 2025 · Place 8 | Groton School | Raw 18:41.00Adj. 18:53.83 | 8 |
| Oct 18, 2025 | Tabor vs. Groton vs. St. Mark'sOct 18, 2025 · Place 11 | Washington Park 5K Course | Raw 18:44.00Adj. 18:57.90 | 11 |
| Oct 4, 2025 | Brooks vs. Rivers, Groton, TaborOct 4, 2025 · Place 10 | Brooks School 5K | Raw 20:29.00Adj. 20:00.23 | 10 |
| Sep 20, 2025 | Governor's vs Brooks vs Groton (JV)Sep 20, 2025 · Place 1 | Governor's 5K Course | Raw 18:57.00Adj. 18:27.52 | 1 |
| Nov 9, 2024 | NEPSTA Division II ChampionshipNov 9, 2024 · Place 53 | Brooks School 5K | Raw 19:42.00Adj. 19:14.33 | 53 |
| Nov 1, 2024 | Independent School League (ISL) ChampionshipNov 1, 2024 · Place 27 | Wrentham Championship 5K | Raw 17:27.70Adj. 17:53.96 | 27 |
| Oct 26, 2024 | Boys XC at NoblesOct 26, 2024 · Place 19 | Noble and Greenough School 5K | Raw 19:23.00Adj. 18:32.93 | 19 |
| Oct 19, 2024 | Groton hosting BrooksOct 19, 2024 · Place 3 | Groton School | Raw 18:13.00Adj. 18:25.51 | 3 |
| Oct 11, 2024 | Middlesex School Cross Country - Varsity BoysOct 11, 2024 · Place 23 | Middlesex 5K Course | Raw 19:55.00Adj. 19:31.68 | 23 |
| Oct 5, 2024 | Brooks vs. Groton, St. Mark's, St. Sebastian'sOct 5, 2024 · Place 6 | Brooks School 5K | Raw 19:25.00Adj. 18:57.72 | 6 |
| Sep 28, 2024 | Governor's vs. Groton, Milton Academy, Tabor, BrooksSep 28, 2024 · Place 13 | Governor's 5K Course | Raw 19:29.00Adj. 18:58.69 | 13 |
| Sep 21, 2024 | Groton vs. BB&N vs. Rivers vs. ThayerSep 21, 2024 · Place 13 | Groton School | Raw 18:50.00Adj. 19:02.93 | 13 |
| Nov 11, 2023 | NEPSTA Division II Championship (JV)Nov 11, 2023 · Place 77 | RL 5K Course | Raw 22:08.00Adj. 21:11.69 | 77 |
| Oct 28, 2023 | Rivers, Tabor, Thayer at GrotonOct 28, 2023 · Place 39 | Groton School | Raw 21:59.00Adj. 22:14.10 | 39 |
| Oct 21, 2023 | Groton, Nobles, Latin at BB&N (JV)Oct 21, 2023 · Place 40 | BB&N 5K Course | Raw 21:17.00Adj. 22:19.53 | 40 |
| Oct 7, 2023 | Brooks, Groton, Lawrence at St. George'sOct 7, 2023 · Place 28 | St. Georges 5K | Raw 22:43.00Adj. 22:18.87 | 28 |