| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:21.23 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 100m Backstroke | 1:15.78 | 2025 NYAC Cup | 2025-11-14 |
| 100m Breaststroke | 1:26.98 | Scar Pan Am Winter Classic | 2026-01-16 |
| 100m Breaststroke | 1:24.21 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 100m Butterfly | 1:21.98 | MAC Rising Star #2 | 2025-05-30 |
| 100m Butterfly | 1:18.58 | 2026 Trojan Pentathlon | 2026-03-06 |
| 100m Freestyle | 1:08.54 | MAC Rising Star #2 | 2025-05-30 |
| 100m Freestyle | 1:04.71 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 100m IM | 1:15.74 | 2026 Trojan Pentathlon | 2026-03-06 |
| 200m Backstroke | 2:51.92 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Backstroke | 2:36.33 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 200m Breaststroke | 3:13.06 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Breaststroke | 3:05.30 | 2025 NYAC Cup | 2025-11-14 |
| 200m Freestyle | 2:27.27 | Scar Pan Am Winter Classic | 2026-01-16 |
| 200m Freestyle | 2:21.54 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 200m IM | 2:44.82 | Scar Pan Am Winter Classic | 2026-01-16 |
| 200m IM | 2:40.56 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Backstroke | 38.27 | MAC Rising Star #2 | 2025-05-30 |
| 50m Backstroke | 36.56 | 2026 Trojan Pentathlon | 2026-03-06 |
| 50m Breaststroke | 39.60 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Breaststroke | 37.98 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Butterfly | 35.29 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Butterfly | 34.80 | 2026 Trojan Pentathlon | 2026-03-06 |
| 50m Freestyle | 31.31 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Freestyle | 30.43 | 2025 NYAC Cup | 2025-11-14 |
| 800m Freestyle | 10:31.18 | David Lawson Invitational 2026 | 2026-01-23 |
Lowther, Kirstyn's top personal bests include 100m Backstroke (1:21.23), 100m Backstroke (1:15.78), 100m Breaststroke (1:26.98), 100m Breaststroke (1:24.21), 100m Butterfly (1:21.98).
Lowther, Kirstyn swims for Oakville Aquatic Club.
Lowther, Kirstyn has competed in 11 meets.