Running
50M
80.5 km
Start: Dec 7, 02:00 PM
Hunter S. Thompson Fear & Loathing 50K / 50M
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Road runs in United States, San Francisco
Distances
Running
50K
50 km
Start: Dec 7, 02:00 PM
About
An annual ultramarathon held in San Francisco with a rich history since 1985, featuring city streets and parallel trail options, with 99% on city streets and ~20% trail options for the 50M.
Catering & aid stations
Aid stations along the course provide food and drink (not pacemaker lines).
Pacers
Pacemakers are provided for both the 50K and 50M. Target times per start wave are published for each distance; the 50K uses 11 hours (finishing by 6:00 PM), and the 50M uses 11 hours 45 minutes. Pacers display pacer flags to help runners maintain pace.
Results
View official resultsSurface mix
- 100% asphalt
Typical weather in San Francisco
Monthly averages based on historical data (2000–present).
Jan56°44°
↑ 07:25
↓ 17:14
Feb58°45°
↑ 07:01
↓ 17:49
Mar59°47°
↑ 07:21
↓ 19:18
Apr61°48°
↑ 06:34
↓ 19:46
May64°51°
↑ 06:00
↓ 20:14
Jun68°53°
↑ 05:48
↓ 20:34
Jul68°55°
↑ 06:01
↓ 20:32
Aug69°56°
↑ 06:26
↓ 20:03
Sep71°56°
↑ 06:53
↓ 19:18
Oct68°54°
↑ 07:19
↓ 18:33
Nov61°48°
↑ 06:51
↓ 16:59
Dec56°44°
↑ 07:19
↓ 16:53
Last updated: Jun 5, 2026, 08:11:48 PM
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