Age-group thresholds

IRONMAN 70.3 Boise · 1 editions (2025) · 1,422 finishers

Editions: 2025

How to read it: in each row, the time under "Top 10%" is the time of the slowest athlete who still made the fastest 10% of the age group. Beat that time and you are in. Age groups with fewer than 5 finishers are omitted. Finishers only.

Men

Age group Finishers Top 1% Top 5% Top 10% Top 20% Median Best
All age groups 1,019 3:51:30 4:18:38 4:41:06 5:13:18 6:08:51 3:40:32
MPRO 44 3:40:32 3:44:59 3:46:27 3:49:57 3:59:04 3:40:32
M18-24 82 4:16:10 4:41:07 5:05:47 5:23:41 6:00:56 4:16:10
M25-29 139 4:11:59 4:32:44 4:52:46 5:14:25 6:04:15 4:09:23
M30-34 156 4:18:38 4:22:15 4:39:50 5:05:47 6:05:25 4:04:41
M35-39 128 4:24:25 4:38:01 4:49:03 5:17:06 6:07:50 4:11:25
M40-44 128 4:12:57 4:25:23 4:50:27 5:09:54 6:04:20 3:56:25
M45-49 87 4:28:50 4:59:04 5:13:13 5:38:23 6:17:35 4:28:50
M50-54 102 4:40:29 4:52:16 4:58:26 5:29:41 6:03:26 4:27:35
M55-59 72 4:39:09 5:03:05 5:14:39 5:48:31 6:25:07 4:39:09
M60-64 50 4:40:33 4:43:43 5:19:37 6:01:53 6:35:41 4:40:33
M65-69 21 5:13:38 5:16:11 6:04:00 6:21:46 7:13:50 5:13:38
M70-74 5 6:31:38 6:31:38 6:31:38 6:31:38 7:22:59 6:31:38

Women

Age group Finishers Top 1% Top 5% Top 10% Top 20% Median Best
All age groups 403 4:14:43 4:37:18 4:59:43 5:26:09 6:26:51 4:01:50
FPRO 26 4:01:50 4:06:49 4:10:32 4:15:56 4:24:23 4:01:50
F18-24 28 4:33:42 5:18:25 5:31:28 5:50:23 6:14:01 4:33:42
F25-29 55 4:40:05 4:59:13 5:13:37 5:29:43 6:19:50 4:40:05
F30-34 49 4:47:11 5:12:25 5:16:35 5:42:49 6:42:51 4:47:11
F35-39 48 4:35:08 4:53:08 4:57:23 5:13:29 6:22:31 4:35:08
F40-44 62 4:37:18 5:13:59 5:22:58 5:54:21 6:42:15 4:37:18
F45-49 42 4:49:21 5:10:11 5:17:45 5:34:44 6:20:52 4:49:21
F50-54 41 4:59:48 5:02:35 5:17:36 5:34:41 6:31:15 4:59:48
F55-59 26 5:25:38 5:43:59 5:50:33 5:53:45 6:45:11 5:25:38
F60-64 8 6:04:06 6:04:06 6:04:06 6:11:05 6:36:17 6:04:06
F65-69 10 6:12:06 6:12:06 6:12:06 6:22:08 6:53:42 6:12:06
F70-74 6 6:49:57 6:49:57 6:49:57 6:54:14 7:13:26 6:49:57

Source: Seffrin A., Nikolaidis P.T., Andrade M.S., Villiger E., Rosemann T., Weiss K., Ferreira D., Knechtle B. (2026). A dataset of 2.7 million IRONMAN triathlon records with transition times (2002-2026), v3.0.0. Zenodo. CC BY 4.0. doi:10.5281/zenodo.22097794.