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NEW HAMPSHIRE
MammothMarch New Hampshire
We are excited to be back at Bear Brook State Park!
After our successful New Hampshire premiere in 2024, we are back in the Granite State for round two!
Our scenic 20-mile route leads through the heavily forested park, which includes seldom visited marshes, bogs, summits and ponds – all ready for you to conquer on September 27, 2025. The leaves will start to change, fall colors will be on display and provide a stunning scenery for a beautiful and challenging adventure.
Mastering our challenge, you will be exhausted, but proud and happy... as well as part of our amazing community of nature-lovers, hikers and MammothMarch addicts!
At a glance
Date: Saturday, September 27, 2025
Location & venue (start/finish): Bear Brook State Park, 150 Deerfield Rd, Allenstown, NH 03275 (our venue does not have an address but will be marked. The entrance is close to the Park’s main office)
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 their finisher medal and considered a winner!
Starting time: You can choose from several time slots as early as 7:00 am with limited capacity when signing up. This ensures the most remote hiking experience as a maximum of 5 hikers will cross the starting line at the same time. The first ones will head out between 7:00 a.m. – 7:15 a.m. with the majority coming back in just about 8 hours. However, we will have our finish line open a little bit longer for the ones that need a bit more time – cut off time at either aid station will be sunset (meaning if you’re hiking at a pace that won’t let you finish before sunset, we will provide a shuttle service back to the venue).
Parking: Complimentary parking will be available on site.
Aid/refreshment stations: There are water stops and 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 and vary between each station, offering water, energy drinks, electrolytes, fruits, cereal/protein bars, sandwiches and more.
Certificates: All finishers will receive their personalized certificate after crossing the finish line. For the ones who drop out, we will issue certificates stating the mileage covered.
Finisher medal/wall of fame: For all participants finishing MammothMarch.
Hiking Pass: MammothMarch Hiking Passes will be made available for all new participants. All participants from previous editions or different MammothMarch events should bring their Hiking Pass to collect their 2025 stamps on site.
Merchandise: Check out our New Hampshire event store right here. Our full 2025 merchandise collection will be available soon.
Route: The single-circuit loop covers 20 miles of all the beauty Bear Brook State Park has to offer, including Lowland trail, Cascade trail, Pitch Pine trail & many more. The final route will be made available around 2 weeks prior to the event but you can check out our 2024 route for reference right here.
Total elevation gain: Around 1,700 ft.
Terrain: A great mix of mainly unpaved hiking trails, dirt trails, gravel roads, forest floor.
What are you waiting for? Sign up here to enter the adventure of a lifetime.
Please check out more details in our FAQ section or contact us contact@mammothmarch.com.
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.