RV travel guide
Custer County
County seat Challis, 4,938 sq mi across Idaho. Everything an RV traveler should read before rolling in — where you can boondock, the roads worth the detour, and the local rule that actually matters.
The county in brief
A traveler's read on Custer County
Custer County's Frank Church-River of No Return Wilderness at 2.4 million acres is the largest contiguous forest wilderness in the contiguous US, larger than Yellowstone NP plus Grand Teton NP combined — a roadless backcountry where the Salmon River's Main and Middle Forks drain northwest through a granite canyon system that has no road crossings between the Idaho-Oregon line and the headwaters at Stanley.
Challis (population 1,000) is the county seat at the confluence of the Salmon River and Garden Creek. Mount Borah at 12,668 ft is Idaho's high point and rises directly from Custer County's Lost River Range. Stanley Lake and Redfish Lake (in adjacent Blaine and Custer county boundary) anchor the most photographed Sawtooth views.
RV travel intelligence
Read the land before you roll in
The three things that shape an RV trip here — where you can boondock, the roads worth the detour, and the local rule that trips travelers up.
Dispersed camping
high
High — most public land permits dispersed
Scenic drives & state byways
Salmon River Scenic Byway US-93 · Land of the Yankee Fork Scenic Byway
Ordinance note for RV travelers
Salmon-Challis NF permits 14-day dispersed across most forest roads; Frank Church-River of No Return Wilderness is the largest contiguous forest wilderness in the lower 48 and prohibits motorized access.
Sourced & cited
Every fact traces to an official source
Population and land area from the US Census; ordinances and park adjacency from county.gov, the National Park Service, and the US Forest Service.
More for Custer County travelers
Go deeper around Custer County
6 cross-linked peers across PickRV's places catalog — siblings, parks, public land, cities, and the parent state hub.
In the same state
Other Idaho counties in our catalog
State parks and forests
Public land near Custer County
Parent state hub
Idaho on PickRV
Sourced from the PickRV places catalog · live availability disclosed on every landing.
Nearby & related
Keep planning Idaho
Sourced costs, campground directories, and the places worth a detour — the next layer of Idaho trip planning.
- Idaho RV rental costFuel · camping · tax, sourced
- Idaho RV-friendly campgroundsHookups, rig limits, booking tips
- RV rental companies in IdahoLocal hosts & outfitters, verified
- Campervan & van rentals in IdahoVan-life routes, rules & rigs
- Lakes & reservoirsWaterside camps & guides
- Hot springsSoak-worthy road stops
- Ghost townsBoom-and-bust detours
- RV driving & licensingLicenses, lanes & low bridges
Idaho rules · last verified 2026-05-10
- Rental tax
- 7.00%
- Min driver age
- 21+ std · 25+ Class A
- Gravel roads
- Allowed — disclosure required
- Generator quiet
- 22:00-07:00
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