No detected openings were recorded in the last 90 days. Campsite Sniper monitors Castle River Cabin continuously and will alert you if that changes.
Of the 183 tracked site-nights (Sep 18, 2026 – Mar 19, 2027): 134 open for online reservation · 49 reserved.
Where the open windows are
Load status
Sep 18, 2026 – Mar 19, 2027Of the open cabin-nights on mapped sites, 74 fall on weekdays and 60 on weekends (Fri–Sun).
Open dates by month
Sep 2026 – Mar 2027September is fully reserved. 0 of 13 tracked site-nights are open there — 13 reserved.
Holiday windows
Sites open per night · of 1 cabin| Window | Night | Sites open | Status |
|---|---|---|---|
| Labor Day | SAT Sep 5 | 0 | None open |
| SUN Sep 6 | 0 | None open | |
| MON Sep 7 | 0 | None open | |
| Thanksgiving | THU Nov 26 | 0 | None open |
| FRI Nov 27 | 0 | None open | |
| SAT Nov 28 | 1 | Open | |
| Christmas | THU Dec 24 | 1 | Open |
| FRI Dec 25 | 1 | Open | |
| New Year | THU Dec 31 | 1 | Open |
| FRI Jan 1 | 1 | Open |
Labor Day: no online availability on any tracked night. Thanksgiving: no cabin is currently available for the complete three-night stay. Thursday and Friday have no online availability; individual Saturday night remains open. Christmas: 1 cabin is available for the complete two-night stay. New Year: 1 cabin is available for the complete two-night stay.
Availability
Most open cabin-nights · tracked window| Cabin | Open cabin-nights |
|---|---|
| P11 | 134 |
This cabin currently has 134 cabin-nights available.
Next windows
As of Sep 18, 2026 snapshotThe next bookable night is Oct 16; the first open weekend starts Oct 16. Campsite Sniper can watch later dates for you.
Stays and site detail
Multi-night stays. 4 2-night, 3 3-night, 3 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Oct 16 at site P11.
All 1 cabin with current availability
| Cabin | Max RV | Hookups | Open cabin-nights | Longest run | Dates |
|---|---|---|---|---|---|
| P11 | Not recorded | None | 134 | 112 nights | Oct 16, Oct 17, Oct 18, Oct 19, Oct 20, Oct 21, Oct 22, Oct 23, Oct 30, Oct 31, Nov 13, Nov 14 +122 more |
About Castle River Cabin
Overview
Castle River Cabin is located on Kupreanof Island on the coastal waters of southeastern Alaska. It offers access to a variety of outdoor recreational opportunities, as well as a secluded place to enjoy its beautiful surroundings.
The cabin is accessible only by boat or float plane from Petersburg or Wrangell, and tides impact access. During low tides, a 2-mile hike is necessary to reach the cabin. Guests are responsible for their own travel arrangements and safety, and must bring several of their own amenities.
Recreation
The Castle River Trail leads a half-mile downstream to the Castle Flats Cabin, and a half-mile upstream to a rowboat and oars. Wildlife can be seen along the trail. Waterfowl, grouse, moose, deer and bear hunting is also available in designated seasons as per state or federal hunting regulations; click here for more information from the Alaska Department of Fish and Game.
Visitors also enjoy fishing for steelhead trout from April to May, trout from May to October, and coho salmon in mid-August through mid-September.
Boating is a popular way to explore the area, but a 16-foot tide is required to cross the tide flats in front of the cabin ( local tide tables ). Life jackets are not available; visitors must bring their own. Visitors may also choose to bring a small outboard motor for the rowboat.
Facilities
The modified A-frame cabin has an extended roof and an upright wall to form a bump-out. It has two double bunks and a sleeping loft to accommodate a total of seven people. The cabin is also equipped with a table, benches, a wood stove and an outhouse with a pit toilet. Firewood is generally available, but is not guaranteed. Firewood is for heating the cabin only, not for outdoor campfires. A broom, dust pan, axe and splitting maul are generally available, but may be missing or damaged. Drinking water is not available at the cabin. Water is available in the nearby river or streams, but it must be treated or boiled prior to consumption. It is recommended that visitors bring their own supply of water for drinking, cooking and cleaning. Visitors need to bring sleeping bags and pads, a cook stove and cooking gear, towels, food, clothing and garbage bags, among other necessities. All trash and food must be packed out, and visitors are expected to clean the cabin before leaving. Click here for more cabin details and maps.
Natural Features
The cabin is located inside a large tide flat on Kupreanof Island at the mouth of the Castle River on the west side of Duncan Canal. The surrounding terrain is predominantly flat-to-rolling old-growth forest and muskeg.
A variety of wildlife makes its home in the area, including moose, deer, black bears, waterfowl and grouse ( learn more about bear safety ).
Getting there
From Petersburg, it is 16 miles by float plane or 30 miles by boat. A 16-foot tide is required for direct boat or float plane access to the cabin. At lower tides, there is up to a 2-mile hike across the sometimes muddy tide flat to get to the cabin. Another option for access is to boat or fly to the Castle Flats Cabin (a 15-foot tide is required for float plane, or a 13-foot tide for boat access there) and hike the easy 0.5-mile trek to the cabin. The Castle River Cabin can be found on USGS topographic map Petersburg C-4. Maps are available online or by calling the Petersburg Ranger District at (907) 772-3871.
View on Recreation.gov ↗ Get directions ↗
Photo gallery
FAQ
How do I get a reservation at Castle River Cabin?
Reservations for Castle River Cabin are made through Recreation.gov. The current snapshot shows substantial availability: 134 of 183 tracked site-nights are open (73.2%), though availability can change. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
Does Campsite Sniper book this campground for me?
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
How current is this availability data?
Campsite Sniper re-checks public Recreation.gov availability for this facility every hour and republishes whenever anything changes. This facility's data last changed at Sep 18, 2026 16:19 UTC; an older timestamp means nothing has changed since that time, not that checking stopped. Always confirm final availability on Recreation.gov when you book.
Can I get a multi-night stay at Castle River Cabin?
3 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Oct 16 at site P11. Confirm and book on Recreation.gov.
Which month has the most availability at Castle River Cabin?
December 2026, with 31 open site-nights in the current snapshot of 31.
When is the next open date at Castle River Cabin?
As of the Sep 18, 2026 snapshot: the next open date is Fri, Oct 16 and the next open weekend starts Fri, Oct 16. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
Stop refreshing. Let the app watch it.
Lakefront, hookups, your RV length, weekends only - set it as picky as you want.
We run paced availability checks for Castle River Cabin. One watch covers every matching site.
When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.