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Humboldt Bay Marathon, Half Marathon and 5k

Event details


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Join us in August for the Fifth Annual Humboldt Bay Marathon, Half Marathon, 5K and Marina Mile Races Sponsored by HPRC, the Humboldt Patient Resource Center.

This is a USATF Sanctioned Event!

How to enter the Humboldt Bay Marathon, Half Marathon and 5k

  1. Half Marathon

    Run 13.1mi
    Event passed
  2. Marathon

    Run 26.2mi
    Event passed
  3. 5k

    Run 5km
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  4. 1 mile

    Run 1mi
    Event passed

Humboldt Bay Marathon, Half Marathon and 5k routes

Marathon Course
The first 23 miles of the marathon course are almost perfectly flat and very close to sea level. Miles 24 and 25 take the course across Humboldt Bay via three low bridges. Each bridge rises no more than 35 feet above the water, so the climbs are not big, but we know that anything after 23 miles is a challenge. There's an aid station right before the first bridge and just after the last one. Mile 26 is partially downhill as it leaves the last bridge and cuts through Old Town Eureka ending just above sea level on the waterfront. The course starts and finishes at Madaket Plaza, 1st and C Streets in Eureka.

Runners will have a maximum of 6 hours 30 minutes to complete the course.

Half Marathon Course
The first 10 miles are almost completely flat and near sea level. Miles 11 and 12 cross Humboldt Bay over a series of three low bridges (max height 35 feet) and the last mile, is slightly downhill to finish on the Eureka Waterfront just above sea level. The race starts near Klopp Lake at the south end of I Street in the Arcata Marsh and finishes at the foot of C street on the Bay (Madaket plaza, Eureka Waterfront)

Runners will have a maximum of 4 hours 30 minutes to complete the course. A free shuttle bus will take half marathon entrants to the start area.

5K Course
This 5k will go out the last 1.55 miles of the marathon course and return.

Event Details

Finisher Medals 🏅: Finisher Medals are given to all marathon and half marathon participants finishing within the allotted time.
Custom Tech Shirt: High quality tech shirts for all marathon and half marathon entrants, with custom artwork by local artist Sara Starr.
Age Group Awards: Winners will receive custom prizes.

Start Times
7:00 am - Marathon
7:00 am - Half Marathon shuttle bus service starts with departures from 1st and C Streets in Eureka
8:30 am - 5K
9:00 am - Half Marathon
9:00 am - Marina Mile

Thank you for your interest in volunteering to help with the Humboldt Bay Marathon! We have many different ways that you can help with this fun event. To sign up, head over to!

Aid Stations
There will be aid stations approximately every 2 miles for both the marathon and half marathon courses. All aid stations will provide Heed, a carbohydrate and electrolyte drink from Hammer Nutrition. Bananas and water will be available as well.

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