Map showing campground location near Hardin, Montana

Grant Marsh

Animal sounds from nearby wildlife fill the nights at Grant Marsh, a fishing access site campground along the Bighorn River. Montana Fish, Wildlife & Parks maintains seven or eight pull-in sites here, though only one or two accommodate RVs up to 28 feet in total length. Two sites sit directly on the riverbank.

The campground provides one vault toilet and garbage collection, with campfires and pets allowed throughout the area. Cellular service remains unavailable according to recent visitors. Access requires attention since GPS directions may lead to a private driveway rather than the actual campground entrance. For additional options, campers can explore places to camp around Hardin seven miles south.

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Location

Public Campground

Grant Marsh is located in Montana

Coordinates

45.84342461 N
107.583574 W

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Connectivity

T-Mobile
No Coverage
Verizon
No Coverage
Verified by 3 users
Last on 3/21/26
AT&T
No Coverage

Connectivity

T-Mobile
No Coverage
Verizon
No Coverage
Verified by 3 users
Last on 3/21/26
AT&T
No Coverage

Access

Drive-In
Park next to your site
Walk-In
Park in a lot, walk to your site.
Boat-In
Sites accessible by watercraft.

Site Types

Tent Sites
Standard (Tent/RV)
Dispersed

Features

For Campers

Phone Service
Toilets
Alcohol
Pets
Fires

For Vehicles

Pull-Through Sites

Contact

General Info

Drive Time

50 min from Billings, MT
2 hrs 38 min from Bozeman, MT
3 hrs 8 min from Casper, WY
4 hrs 8 min from Great Falls, MT

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5 Stars

4 Stars

3 Stars

2 Stars

1 Star

4.5

out of 5

3 Reviews

Small campground with 7-8 basic sites near Big Horn River. Guests appreciated the serene location and clean facilities, though larger RVs face limited space and no cell service.

David M.

Scout

Reviewed Jun. 24, 2025

Good site, directions are deceptive

Pulled in late at night, it was confusing finding it as the pin sends you to a private driveway. The previous turn in the road has the turn off the campsite though. Lots of lovely animal noises

Month of VisitJune

Steve M.

Legend

Reviewed Jul. 6, 2024

True, dispersed camping, No Frills but beautiful

The Custer fishing access site was closed for no reason so I found this spot about 30 miles from billings. Only about seven or eight pull in sights and not very large. I have a 28 ft total length and there were only one or two spots that would work. Only two spots I could find right on the Big Horn river, but a beautiful and Serene location. One Vault toilet and a couple of garbage cans in one locale. No cellular service whatsoever.

SiteGrant Marsh river access site

Month of VisitJuly

nick

Scout

Reviewed May. 8, 2022

Quiet little place by the river

Not a lot of marked camping spots a nice little place to stay and a clean bathroom (just a toilet, no running water)

Month of VisitMay

Frequently Asked Questions

Where is Manuel Lisa Campground located in Custer, Montana?

There appears to be some confusion in the question. Manuel Lisa is a different campground from Grant Marsh. Grant Marsh campground is located approximately 30 miles from Billings, Montana along the Big Horn River. The exact location can be somewhat confusing to find, as GPS pins may direct you to a private driveway. The correct access point is at a turn just before this driveway. For precise directions to Manuel Lisa Campground in Custer, it would be best to contact the local park authority or check official Montana Fish, Wildlife & Parks resources.

What historical significance does Grant Marsh have to the campground area?

Grant Marsh is named after the notable steamboat captain who played a significant role in the history of river navigation along the Yellowstone and Big Horn Rivers in Montana during the late 1800s. Captain Marsh was known for his skill in navigating shallow and difficult river passages, which was crucial for transportation and supply lines during western expansion. While the campground itself is a small, primitive site along the Big Horn River, its name honors this historical figure who contributed to the development of the region. The riverside location connects visitors to the same waterways that were vital transportation corridors during Montana's early settlement period.

Are fires allowed at Grant Marsh?

Yes, according to campers on TheDyrt.com, fires are allowed at Grant Marsh, although make sure to check current fire restrictions in the area.

Does Grant Marsh have wifi?

No, according to campers on TheDyrt.com, Grant Marsh does not have wifi.

Is there cell phone reception at Grant Marsh?

According to campers on TheDyrt.com, there is no coverage for AT&T, no coverage for T-Mobile, and no coverage for Verizon.

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