State Park / State Forest
Near Glenns Ferry, Idaho: $25–$45/night, rigs to 50 ft. Open Year-round. Book 9 months ahead via ID State Parks portal.
State Park / State Forest
Managing authority
Near Glenns Ferry, Idaho
How much does camping at Three Island Crossing State Park Campground cost, and when is it open?
Three Island Crossing State Park Campground near Glenns Ferry, Idaho (State Park / State Forest) — camping fee $25–$45/night, season Year-round, RV size limit Up to 50 ft. Reservations: 9 months ahead via ID State Parks portal — book direct through the official channel.
The numbers
Fee range
$25–$45/night
Season open
Year-round
RV size limit
Up to 50 ft
Reservation window
9 months ahead via ID State Parks portal
The insider read
Oregon Trail historic crossing site. The Oregon Trail History and Education Center on-site is free with camping. Snake River sites face west — sunset on Camas Prairie hills.
Original analysis from PickRV — synthesised from public sources you can verify, pulling the operational details competitor guides typically skip.
Verify at parksandrecreation.idaho.govOn site
Book it right
PickRV doesn't handle campground bookings — reserve direct through the official channel so policies and cancellations flow through one record.
Opens idahostateparks.reserveamerica.com
Every fact above is sourced from the managing agency's canonical page. Cross-check fee, season, and size limit before you depend on them.
Match the campground's size limit and hookup level to a vehicle category, then plan the rest of the trip.
Keep exploring
Near Orofino
COEInsider tip · Largest USACE reservoir in Idaho. Boat-in only sites on most coves — Three Meadows is one of the few accessible by road. Steelhead fishing September-October the unique-fish reason to visit.
Near St. Charles
StateInsider tip · Bear Lake's turquoise water — limestone particles refract light like the Caribbean. East Beach has the calmer water for swimming; North Beach has the wind for kiting. Famous raspberry farms harvest late July.
Near Athol
StateInsider tip · Lake Pend Oreille — deepest lake in Idaho. Former WWII naval training base; remnants visible along the Brig Trail. Whitetail loop has the largest pull-throughs; Snowberry loop has the lake views.
Near Arco
NPSInsider tip · Camp on a 2,000-year-old lava flow — surreal black-rock landscape. Bring closed shoes (sharp 'a'a lava). Dark-sky park; bring a red-light headlamp. Indian Tunnel lava-tube hike a 10-min drive.
Nearby & related
Sourced costs, campground directories, and the places worth a detour — the next layer of Idaho trip planning.
Before you go
Idaho rules
Verified 2026-05-10