106-yard Japanese backyard record
Completed 106 yards for 710.836 km at Big Dog’s Backyard Ultra and placed fifth overall. Big’s national-record table lists the mark as Japan’s best.
Source-checked athlete record · Updated Oct 19, 2026
Kazuhiro Kawahata
Japanese backyard record holder at 106 yards
Kazuhiro Kawahata holds Japan’s backyard record of 106 yards, set at Big Dog’s in 2025, and heads Japan’s 2026 World Team Championship list.
JapanSakai, Osaka, JapanM50
Still running at the World Team Championship · 51 yardsBackyard Ultra World Team Championship 2026 · Still running
51 yards completed and still in the race
Japan is 1st with 769 yards and 15 runners still in.
From the organizer’s live results after yard 52 (15:53 UTC, 19 October). Live results ↗ Championship guide →
The record so far
Kazuhiro Kawahata is a Japanese ultrarunner from Sakai in Osaka Prefecture who holds his country’s backyard ultra record. At Big Dog’s Backyard Ultra in October 2025 he completed 106 yards for 710.836 km, placing fifth overall and first in the M50 category. Big’s national-record table lists the mark as Japan’s best.
His backyard career is short. He won Last Samurai Standing in Kyoto in November 2023 with 42 yards, then won the Japan site of the 2024 World Team Championship with 92 yards, one yard ahead of Tokimasa Hirata. Around those races, DUV lists a long record of mountain 100-milers, 24-hour races in Kobe and a fourth place at the 2025 Hirosaki 6-day race with 833.220 km. He also finished the 169 km Lake Biwa 100 a week before his record run at Big’s.
Kawahata heads Japan’s official selection list for the 2026 Backyard Ultra World Team Championship, which started on 17 October 2026, on the strength of his 106-yard qualifier.
Defining performances
↗
World Team Championship Japan winner
Was the last runner standing at the Japan site of the 2024 World Team Championship with 92 yards, one more than Tokimasa Hirata’s 91. Yardlore lists the result as the venue record.
833 km at the Hirosaki 6days
Covered 833.220 km over six days in Hirosaki to place fourth overall and first in the M50 category.
Last Samurai Standing Kyoto winner
Won his first recorded backyard ultra with 42 yards in Kyoto, one yard ahead of Naota Takemura.
Performance history
| Date | Event | Performance | Result | Source |
|---|---|---|---|---|
| OSJ Ontake 100 Mile Ultra Trail100-mile trail | 19:54:33 | 9th overall · 1st M50 | View ↗ | |
| Big Dog’s Backyard UltraBackyard ultra | 106 yards · 710.836 km | 5th overall · Japanese record | View ↗ | |
| Lake Biwa 100169 km ultra | 30:37:18 | 14th overall · 1st M50 | View ↗ | |
| Hirosaki 6days Ultra Run6-day road race | 833.220 km | 4th overall · 1st M50 | View ↗ | |
| NOT12 Shioya Sanzan 100km Night100 km | 11:24:33 | 2nd overall | View ↗ | |
| Backyard Ultra World Team Championship — JapanBackyard ultra | 92 yards · 616.952 km | Winner | View ↗ | |
| 24-hour relay & solo marathon Kobe24-hour | 195.500 km | 11th overall | View ↗ | |
| Last Samurai Standing Backyard Ultra — KyotoBackyard ultra | 42 yards · 281.652 km | Winner | View ↗ | |
| OSJ Kami 7474 km | 8:48:50 | Winner | View ↗ |
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