Beatrice Song

Born : 1961 Cat. W65 Ultrarunner since 2003

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details

Countries visited ?

Canada

United States

51,1%

Rank quotient ?This runner's calculation uses 73 eligible race(s): Σ(rank − 1) = 5 643; Σ finishers = 11 036. 5 643 / 11 036 × 100 = 51.13%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed73

Km — ultra races4 501 km

> 100 km2

> 160 km2

Longest race160,9 km

21st Rio Del Lago 100 Mile Endurance Run — 6/11/2021

Km per year (ultra races)

330

2022

291

2023

201

2024

116

2025

2026

Race types (share of distance)

Road1,1%

Trail98,9%

Wins & podiums (ultra)

🏆 Win0

🏆 Win F5

🏅 Top 30

🏅 Top 3 F9

Longest winning streak0

Current streak0

Records

50 km5h07'44 100 km12h28'39 50 mi8h59'59 100 mi27h45'34 12 h96,93 km

HISTORY

73 race(s)

Date		Race	Perf.	Rk
2026
19.09	50km	8th Three Sisters Skyline 50km Race	8:19:17 h	115
2025
09.08	40mi	16th Fat Dog 40 Mile Trail Race	15:26:12 h	68
21.06	52km	12th Headwaters Trail Run 50K	10:04:38 h	79
2024
17.08	31.5mi	23rd Tamalpa Headlands 50K	7:44:11 h	163
13.07	50km	26th Siskiyou Out Back 50 km Trail Run	7:56:36 h	166
24.02	50km	1st The Big Alta	7:47:49 h	161
27.01	50km	12th Fort Ord 50K Trail Run	6:41:48 h	59
2023
08.07	50km	25th Siskiyou Out Back 50 km Trail Run	6:59:32 h	97
06.05	100km	26th Miwok 100k Trail Race	14:32:00 h	193
01.04	50mi	43th American River 50 Mile Endurance Run	10:56:30 h	76
19.02	60.2km	10th Black Canyon Trail 60 km Run	8:57:52 h	189
2022
18.06	50km	9th Headwaters Trail Run 50K	9:30:19 h	32
07.05	100km	25th Miwok 100k Trail Race	15:32:16 h	243
16.04	50km	7th Woodside Purisima Creek Crossover	6:34:56 h	23
12.03	50mi	10th Marin Ultra Challenge 50 Mile Race	12:14:24 h	91
05.02	50km	12th Golden Gate 50 km Winter Trail Run	7:06:50 h	20
2021
06.11	100mi	21st Rio Del Lago 100 Mile Endurance Run	27:45:34 h	156
23.10	50km	38th Quicksilver 50 km Endurance Run	6:33:40 h	67
25.09	50mi	39th Dick Collins Firetrails 50 Mile	11:25:03 h	23
10.07	50km	23rd Siskiyou Out Back 50 km Trail Run	8:40:13 h	157
12.06	50mi	4th Wy’east Wonder 50 Mile Trail Race	12:46:23 h	149
08.05	50km	26th McDonald Forest 50K Trail Run	7:04:32 h	128
26.03	50km	11th Badger Mountain 50 km Challenge	7:13:13 h	60
2020
20.06	50mi	2nd Mount Shasta Gateway 50 Mile Trail Race	14:09:15 h	60
2019
04.08	50km	38th Skyline 50k Endurance Run	6:30:29 h	80
13.07	50km	20th Siskiyou Out Back 50 km Trail Run	7:00:42 h	114
2016
25.03	50km	6th Badger Mountain 50 km Challenge	6:51:52 h	18
2015
16.05	50mi	7th Sun Mountain 50 Mile Trail Races	10:55:36 h	57
18.04	50km	5th Yakima Skyline Rim 50k	9:03:43 h	112
27.03	50km	5th Badger Mountain 50 km Challenge	6:32:04 h	25
2013
24.08	31.5mi	14th Tamalpa Headlands 50K	6:35:54 h	105
11.08	50km	32nd Skyline 50k Endurance Run	5:37:05 h	92
02.06	50km	3rd Canyon Meadow (Spring) 50 km Trail Run	5:40:04 h	10
19.05	50km	26th Ohlone 50K Wilderness Run	7:19:12 h	74
11.05	50km	30th Quicksilver 50 km Endurance Run	5:57:08 h	28
05.01	50km	3rd Crystal Springs 50 km Winter Trail Run	5:44:41 h	15
2012
05.05	100km	17th Miwok 100k Trail race	15:33:31 h	190
17.03	50km	2nd Canyon Meadow (Winter) 50 km Trail Run	5:38:50 h	19
2010
28.08	100mi	12th Cascade Crest Classic 100 Mile	29:51:14 h	59
14.08	50km	1st Redwood Summer Trail Run	5:48:07 h	5
01.08	50km	29th Skyline 50k Endurance Run	5:20:45 h	52
13.06	50km	1st San Lorenzo River Trail Run	6:05:35 h	8
23.05	50km	9th Big Basin Redwoods Trail Run	6:42:18 h	8
01.05	100km	15th Miwok 100k Trail race	12:28:39 h	111
18.04	50km	3rd Skyline to the Sea 50km	5:27:38 h	54
06.02	50km	9th Woodside Trail Run 50K	5:38:18 h	34
23.01	50km	7th Pacifica 50 km Trail Run - Winter Edition	6:32:10 h	25
2009
19.12	50km	5th Rodeo Beach 50km	5:21:40 h	36
02.08	50km	28th Skyline 50k Endurance Run	5:26:09 h	51
18.07	50km	8th Tahoe Rim Trail 50km Endurance Runs	7:09:07 h	27
06.06	50km	2nd Endurance Challenge - Washington Trail 50 km	6:39:53 h	58
04.04	50mi	30th American River 50 Mile Endurance Run	8:59:59 h	135
28.02	50km	5th Sequoia Trail Run	6:07:19 h	40
07.02	50km	8th Woodside Trail Run 50K	5:52:10 h	48
2008
20.09	50km	1st Skyline to the Sea 50km	5:47:25 h	53
03.08	50km	27th Skyline 50k Endurance Run	5:18:16 h	33
05.07	50km	6th Angel Island 50k	5:21:54 h	27
03.05	100km	13th Miwok 100k Trail race	13:23:44 h	170
19.04	50km	22th Ruth Anderson Ultra 50km	5:07:44 h	8
05.04	50mi	29th American River 50 Mile Endurance Run	9:31:26 h	170
22.03	50km	7th Pirates Cove Trail Run	6:05:04 h	36
01.03	50km	6th Skyline Ridge Trail Run	5:53:24 h	32
2007
02.09	50km	12th Run On The Sly 50 km	6:16:55 h	33
19.05	12h	3rd Watershed Preserve 12 Hr Trail Race	96.930 km	10
2006
18.11	50mi	44th JFK 50 Mile	10:36:22 h	542
2005
02.04	50mi	26th American River 50 Mile Endurance Run	9:16:06 h	133
2004
01.08	50km	23rd Skyline 50k Endurance Run	5:22:03 h	49
19.06	50km	2nd Skyline Ridge Trail Run	5:48:12 h	16
05.06	50km	4th Mount Diablo 50K	7:34:22 h	20
08.05	50km	21st Quicksilver 50 km Endurance Run	5:47:02 h	29
27.03	50km	3rd Pirates Cove Trail Run	6:14:10 h	19
2003
08.11	50km	8th Helen Klein Ultra Classic 50km	5:16:55 h	17
03.08	50km	22nd Skyline 50k Endurance Run	5:25:38 h	54

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	6/11/2021	21st Rio Del Lago 100 Mile Endurance Run	160,93	×3
✓ 2	28/8/2010	12th Cascade Crest Classic 100 Mile	160,93	×3
✓ 3	6/5/2023	26th Miwok 100k Trail Race	100,00	×2
✓ 4	7/5/2022	25th Miwok 100k Trail Race	100,00	×2
✓ 5	5/5/2012	17th Miwok 100k Trail race	100,00	×2
✓ 6	1/5/2010	15th Miwok 100k Trail race	100,00	×2
✓ 7	3/5/2008	13th Miwok 100k Trail race	100,00	×2
✓ 8	19/5/2007	3rd Watershed Preserve 12 Hr Trail Race	96,93	×1
✓ 9	1/4/2023	43th American River 50 Mile Endurance Run	80,47	×1
✓ 10	12/3/2022	10th Marin Ultra Challenge 50 Mile Race	80,47	×1
✓ 11	25/9/2021	39th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 12	12/6/2021	4th Wy’east Wonder 50 Mile Trail Race	80,47	×1
✓ 13	20/6/2020	2nd Mount Shasta Gateway 50 Mile Trail Race	80,47	×1
✓ 14	16/5/2015	7th Sun Mountain 50 Mile Trail Races	80,47	×1
✓ 15	4/4/2009	30th American River 50 Mile Endurance Run	80,47	×1
✓ 16	5/4/2008	29th American River 50 Mile Endurance Run	80,47	×1
✓ 17	18/11/2006	44th JFK 50 Mile	80,47	×1
✓ 18	2/4/2005	26th American River 50 Mile Endurance Run	80,47	×1
✓ 19	9/8/2025	16th Fat Dog 40 Mile Trail Race	64,37	×1
✓ 20	19/2/2023	10th Black Canyon Trail 60 km Run	60,20	×1
✓ 21	21/6/2025	12th Headwaters Trail Run 50K	52,00	×1
✓ 22	17/8/2024	23rd Tamalpa Headlands 50K	50,69	×1
✓ 23	24/8/2013	14th Tamalpa Headlands 50K	50,69	×1
✓ 24	19/9/2026	8th Three Sisters Skyline 50km Race	50,00	×1
✓ 25	13/7/2024	26th Siskiyou Out Back 50 km Trail Run	50,00	×1
✓ 26	24/2/2024	1st The Big Alta	50,00	×1
✓ 27	27/1/2024	12th Fort Ord 50K Trail Run	50,00	×1
✓ 28	8/7/2023	25th Siskiyou Out Back 50 km Trail Run	50,00	×1
✓ 29	18/6/2022	9th Headwaters Trail Run 50K	50,00	×1
✓ 30	16/4/2022	7th Woodside Purisima Creek Crossover	50,00	×1
✓ 31	5/2/2022	12th Golden Gate 50 km Winter Trail Run	50,00	×1
✓ 32	23/10/2021	38th Quicksilver 50 km Endurance Run	50,00	×1
✓ 33	10/7/2021	23rd Siskiyou Out Back 50 km Trail Run	50,00	×1
✓ 34	8/5/2021	26th McDonald Forest 50K Trail Run	50,00	×1
✓ 35	26/3/2021	11th Badger Mountain 50 km Challenge	50,00	×1
✓ 36	4/8/2019	38th Skyline 50k Endurance Run	50,00	×1
✓ 37	13/7/2019	20th Siskiyou Out Back 50 km Trail Run	50,00	×1
✓ 38	25/3/2016	6th Badger Mountain 50 km Challenge	50,00	×1
✓ 39	18/4/2015	5th Yakima Skyline Rim 50k	50,00	×1
✓ 40	27/3/2015	5th Badger Mountain 50 km Challenge	50,00	×1
✓ 41	11/8/2013	32nd Skyline 50k Endurance Run	50,00	×1
✓ 42	2/6/2013	3rd Canyon Meadow (Spring) 50 km Trail Run	50,00	×1
✓ 43	19/5/2013	26th Ohlone 50K Wilderness Run	50,00	×1
✓ 44	11/5/2013	30th Quicksilver 50 km Endurance Run	50,00	×1
✓ 45	5/1/2013	3rd Crystal Springs 50 km Winter Trail Run	50,00	×1
✓ 46	17/3/2012	2nd Canyon Meadow (Winter) 50 km Trail Run	50,00	×1
✓ 47	14/8/2010	1st Redwood Summer Trail Run	50,00	×1
✓ 48	1/8/2010	29th Skyline 50k Endurance Run	50,00	×1
✓ 49	13/6/2010	1st San Lorenzo River Trail Run	50,00	×1
✓ 50	23/5/2010	9th Big Basin Redwoods Trail Run	50,00	×1
51	18/4/2010	3rd Skyline to the Sea 50km	50,00	×1
52	6/2/2010	9th Woodside Trail Run 50K	50,00	×1
53	23/1/2010	7th Pacifica 50 km Trail Run - Winter Edition	50,00	×1
54	19/12/2009	5th Rodeo Beach 50km	50,00	×1
55	2/8/2009	28th Skyline 50k Endurance Run	50,00	×1
56	18/7/2009	8th Tahoe Rim Trail 50km Endurance Runs	50,00	×1
57	6/6/2009	2nd Endurance Challenge - Washington Trail 50 km	50,00	×1
58	28/2/2009	5th Sequoia Trail Run	50,00	×1
59	7/2/2009	8th Woodside Trail Run 50K	50,00	×1
60	20/9/2008	1st Skyline to the Sea 50km	50,00	×1
61	3/8/2008	27th Skyline 50k Endurance Run	50,00	×1
62	5/7/2008	6th Angel Island 50k	50,00	×1
63	19/4/2008	22th Ruth Anderson Ultra 50km	50,00	×1
64	22/3/2008	7th Pirates Cove Trail Run	50,00	×1
65	1/3/2008	6th Skyline Ridge Trail Run	50,00	×1
66	2/9/2007	12th Run On The Sly 50 km	50,00	×1
67	1/8/2004	23rd Skyline 50k Endurance Run	50,00	×1
68	19/6/2004	2nd Skyline Ridge Trail Run	50,00	×1
69	5/6/2004	4th Mount Diablo 50K	50,00	×1
70	8/5/2004	21st Quicksilver 50 km Endurance Run	50,00	×1
71	27/3/2004	3rd Pirates Cove Trail Run	50,00	×1
72	8/11/2003	8th Helen Klein Ultra Classic 50km	50,00	×1
73	3/8/2003	22nd Skyline 50k Endurance Run	50,00	×1