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Saturday, October 14 | Joseph D. Grant County Park

The nation’s biggest hiking series is coming to Joseph D. Grant County Park, California!
Located just 60 miles southeast of San Francisco, Santa Clara County’s largest Park features almost 11,000 acres of open space resources as well as rich environmental, cultural and recreational assets.

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Our 20-mile, single-circuit hiking loop features the characteristic of the east foothills of the Santa Clara Valley with grasslands and majestic oak trees.

Hiking 20 miles in 8 hours, you will be exhausted, but proud and happy... as well as part of our amazing community of nature-lovers, hikers and MammothMarch addicts!

Time & Location

October 14, 7:30 AM

Joseph D. Grant County Park, 18405 Mt Hamilton Rd

At a glance


Date: Saturday, October 14, 2023


Distance: 20 miles in 8 hours
There is no timekeeping, there are no failures, we only recognize the incredible courage it takes to rise to our challenge. Every participant completing the distance will be awarded with their finisher medal and considered a winner!


Starting time: Several starting slots are available from 7:15 a.m. You can choose from specific time slots with limited capacity when signing up. This ensures the most remote hiking experience as a maximum of 5 participants cross the starting line at the same time. The first hikers will start as early as 7:15 a.m. with the majority coming back in just about 8 hours. However, we will have our finish line open for the ones that need a bit more time.


Venue (start/finish): Joseph D. Grant County Park, 18405 Mt Hamilton Rd, Mt Hamilton, CA 95140


Parking: Parking will be available on site.


Aid/refreshment stations: There are up to 3 water stops/aid stations along the route (approximately positioned every 5-7 miles apart) providing toilets, food and drinks for all participants. These refreshments are included in the cost of your ticket. The refreshments will vary between refreshment stations, providing water, coffee, tea, isotonic drinks, fruits, cereal bars, etc.

Certificates: All finishers receive their personalized certificate after crossing the finish line. For the ones who drop out, we issue certificates stating the mileage covered.

Hiking pass:  MammothMarch Hiking Passes will be made available for all new participants. All participants from a different MammothMarch event should bring their Hiking Pass to collect their stamps on site.


Finisher medal/wall of fame:  For all participants finishing MammothMarch.

Merchandise: Our 2023 merchandise collection can be viewed right here: Pre-orders are available until around two weeks before the event, but we will also sell merchandise on site (while stocks last).

Route: The single-circuit loop leads through the remote Joseph D. Grant County Park, along various trails, such as Dairy Trail, Heron Trail, Bass Lake Trail, Washburn Trail.

Total elevation gain: Around 3,900 ft.

Terrain: A great mixture of paved and unpaved hiking trails, dirt trails, gravel roads, forest floor.

What are you waiting for? Click here to sign up for the adventure of a lifetime.


What are you waiting for? Sign up here to enter “not your average hike”.

Please check out more details in our FAQ section or contact us

The route will be made available approximately 2 weeks prior to the event. Please note that the route is preliminary and may be adjusted due to weather issues, official directives and/or organizational matters. The route will be marked 1-2 days prior to event day. Should we notice parts of the route being inaccessible, extremely wet/muddy we will adapt it to local conditions at short notice.

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