Thirza Koers
Netherlands (NED)
April 2003 (LN4)
Personal Records
| 500m | 42,26 | 22 January 2023 | Heerenveen (NED) |
| 1000m | 1.24,89 | 29 January 2023 | Heerenveen (NED) |
| 1500m | 2.09,77 | 28 January 2024 | Heerenveen (NED) |
| 3000m | 4.40,22 | 11 December 2022 | Heerenveen (NED) |
Season Bests
| 1500m | 2.10,40 | 12 October 2024 | Heerenveen (NED) |
| 500m | 42,49 | 28 January 2024 | Heerenveen (NED) |
| 1000m | 1.26,67 | 3 February 2024 | Groningen (NED) |
| 1500m | 2.09,77 | 28 January 2024 | Heerenveen (NED) |
| 3000m | 4.44,87 | 1 October 2023 | Heerenveen (NED) |
| 100m | 11,71 | 26 December 2022 | Heerenveen (NED) |
| 300m | 27,77 | 26 December 2022 | Heerenveen (NED) |
| 500m | 42,26 | 22 January 2023 | Heerenveen (NED) |
| 1000m | 1.24,89 | 29 January 2023 | Heerenveen (NED) |
| 1500m | 2.09,99 | 22 January 2023 | Heerenveen (NED) |
| 3000m | 4.40,22 | 11 December 2022 | Heerenveen (NED) |
| 100m | 12,35 | 26 February 2022 | Heerenveen (NED) |
| 300m | 28,92 | 26 February 2022 | Heerenveen (NED) |
| 500m | 44,05 | 20 February 2022 | Heerenveen (NED) |
| 1000m | 1.26,72 | 20 February 2022 | Heerenveen (NED) |
| 1500m | 2.14,73 | 16 October 2021 | Heerenveen (NED) |
| 3000m | 4.48,32 | 13 February 2022 | Heerenveen (NED) |
| 100m | 11,83 | 25 January 2020 | Groningen (NED) |
| 300m | 28,87 | 15 February 2020 | Groningen (NED) |
| 500m | 43,83 | 1 March 2020 | Heerenveen (NED) |
| 1000m | 1.28,02 | 16 February 2020 | Heerenveen (NED) |
| 1500m | 2.15,95 | 1 March 2020 | Heerenveen (NED) |
| 3000m | 4.53,36 | 14 December 2019 | Groningen (NED) |
| 300m | 29,48 | 15 December 2018 | Berlin (GER) |
| 500m | 44,64 | 12 January 2019 | Groningen (NED) |
| 1000m | 1.28,84 | 20 January 2019 | Leeuwarden (NED) |
| 1500m | 2.17,25 | 12 January 2019 | Groningen (NED) |
| 3000m | 4.51,52 | 13 March 2019 | Groningen (NED) |
| 300m | 29,91 | 16 December 2017 | Berlin (GER) |
| 500m | 45,34 | 11 March 2018 | Heerenveen (NED) |
| 1000m | 1.30,59 | 11 March 2018 | Heerenveen (NED) |
| 1500m | 2.21,42 | 3 March 2018 | Groningen (NED) |
| 500m | 47,38 | 18 March 2017 | Groningen (NED) |
| 1000m | 1.39,82 | 26 November 2016 | Groningen (NED) |
| 1500m | 2.30,23 | 18 March 2017 | Groningen (NED) |
| 500m | 50,67 | 12 March 2016 | Groningen (NED) |
| 1000m | 1.43,29 | 12 March 2016 | Groningen (NED) |
| 500m | 53,84 | 21 February 2015 | Groningen (NED) |
| 500m | 58,49 | 22 February 2014 | Groningen (NED) |
Results
| Mass Start Competitie 4 | Deventer (NED) | 19 October 2025 | ||||||||
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| Mass Start Competitie 3 | Heerenveen (NED) | 5 October 2025 | ||||||||
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| Mass Start Competitie 1 | Heerenveen (NED) | 21 September 2025 | ||||||||
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| Mass Start Competitie 2 | Heerenveen (NED) | 13 October 2024 | ||||||||
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| NK Clubs 2024 | Heerenveen (NED) | 12 October 2024 | ||||||||
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Native Language Names