Friday, Feb 28, 2020 @ 5:00 PM

Big Bloops Ultra

2690 Terminal Blvd

Palo Alto, CA 24hrs

This Event Took Place Fri. Feb 28, 2020

Third Annual Big Bloops Ultra

Inspired by BIG BACKYARD ULTRA | with support from BAYLOOPS.COM

When we last ran this race in February 2020, we didn't realize it would be our last one for a long time! After a hiatus in 2021, Big Bloops Ultra is BACK in 2022. Let's celebrate the return of group running and racing with a whole lot of BLOOOOOOOOOOOOOOOOOOOOPS!


This is a 24-hour timed event. It does not share the "last person standing" format of its namesake; instead it is designed to encourage participation throughout the event from runners of all abilities. You have the option to take part in one of two formats:

  • 24-HOUR BLOOPATHON - Flexible schedule. Run as many bloops as you can within the 24-hour period, at any pace. Try to break the most-bloops-in-one-activity record that is currently only 20. Lead by Daniel Aminzade.
  • BLOOPING LIKE CLOCKWORK - Timed departures. One bloop will begin every 72 minutes, for a total of 20 bloops (100 miles). Join for as many or as few as you like. No leader for this one yet, volunteers welcome!

Course Description

Enjoy the beauty of the San Francisco Bay on the BLOOP. Officially known as the Adobe Creek Loop Trail, the bloop is a scenic 5-mile (8km) loop meandering around Adobe Creek, Charleston Slough, Matadero Creek, and the Mayfield Slough. It consists of 1 mile of pavement and 4 miles of smooth dirt, and is extremely flat, with less than 20ft of elevation gain and loss per loop. It provides opportunities to see a wide variety of waterfowl, including pelicans, egrets, herons, Canada geese, seagulls, and ducks.


Parking is available at the Palo Alto Baylands Nature Preserve Trailhead, 2690 Terminal Blvd, Palo Alto, CA 94303. The bloop begins and ends just north of the trailhead at the pumphouse.


Bloops may be run in the clockwise or widdershins direction. Your score in the event will be the total number of bloops completed during the 24-hour period in either direction. Partial bloops will not be counted toward your score. You are permitted to leave the course and return during the 24-hour period if you choose.


The run begins on Friday evening. It continues through the night and the subsequent day, finishing on Saturday at 17:00. We recommend taking Sunday as a recovery day.

The run will happen rain or shine, and will NOT be canceled in the event of bad weather.

4 March 2022 17:00START
4 March 2022 18:05Sunset
5 March 2022 06:34 Sunrise
5 March 2022 17:00 (+24h)FINISH
5 March 2022 18:02Sunset

Support and Amenities

This is an unofficial, free, grassroots, fully self-supported event. We will collect and publish results, but there will be no bibs, no chip timing, no shirt, no awards, no finisher medals, no on-course photographer, and no whining. We do intend to provide one self-service aid station along the course, but recommend you plan to be self-sufficient and provide for your own nutrition and hydration.

If you intend to participate (even for just part of the event), please register through UltraSignup in advance. There is no entry fee. To comply with park policies, the event is capped at 24 entries, making it even more exclusive than Western States, so get your registration in early!

Attendees will be able to order an event T-shirt if they choose.

Local time: 2:59 PM


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