Castle Flats Cabin
Tongass National Forest — riverside, fishing, hiking
Location: PETERSBURG, AK, AK
Price: From $25 per night
Rating: 3 out of 5 (2 reviews)
Season: May through October
Castle Flats 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, and tides impact access.
Cell coverage (FCC estimate): weak signal. Actual signal may vary in remote areas. Best carrier: AT&T.
Amenities: Fire Rings, Picnic Tables, Drinking Water, Camp Host, Fishing, Firewood for Sale
Availability alerts: Set a free cancellation alert at camperwatch.org/campground/castle-flats-cabin to be notified when sites open up.
Castle Flats Cabin offers secluded access to southeastern Alaska's coastal waters with opportunities for fishing, hiking, and wildlife viewing on Kupreanof Island.
Insider tips for Castle Flats Cabin: Book early as this is a federal campground with only 1 site Plan your arrival around tides: 15-foot tide required for float plane access, 13-foot tide for boat access During low tides, budget 2 miles of hiking to reach the cabin
Skip Castle Flats Cabin if: You need hookups - none are available. You cannot arrange your own boat or float plane transportation from Petersburg. You are unable to hike or have mobility concerns, as tide-dependent access may require a 2-mile trek.
Best time to visit Castle Flats Cabin: May-October — Campground operates seasonally during these months only.
Nearby campgrounds: Castle River Cabin (PETERSBURG, AK), Breiland Slough Cabin (PETERSBURG, AK), Kah Sheets Lake Cabin (PETERSBURG, AK), Beecher Pass Cabin (PETERSBURG, AK).
Cell Phone Coverage at Castle Flats Cabin
Cell signal at Castle Flats Cabin (PETERSBURG, AK): weak overall signal based on FCC broadband data. Best carrier: AT&T.
- AT&T 4G LTE: 100% coverage
Coverage data source: FCC Broadband Data Collection (BDC). Actual signal may vary due to terrain, tree cover, and distance from towers. Camper reports are more reliable than coverage maps in remote areas.
Castle Flats 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, and tides impact access.
Verified facts
RIDB / Recreation.gov official databaseAmenities
RIDB /facilities /campsites · owner-verifiedStraight talk
CamperWatch intel · curated from camper reportsKnown issues, each with the workaround. Read before you book.
Insider tips & when to go
CamperWatch intel · hand-curated entryBook early as this is a federal campground with only 1 site
Plan your arrival around tides: 15-foot tide required for float plane access, 13-foot tide for boat access
During low tides, budget 2 miles of hiking to reach the cabin
Campground operates seasonally during these months only
Things to do nearby
RIDB /activities /recareas + intelConditions today
LiveCell signal
FCC BDC · quarterly datasetFCC maps are theoretical — camper reports confirm signal. Best carrier: AT&T.
Location
Leaflet · OpenStreetMap tiles
Getting there →
From Petersburg, it is 16 miles by float plane or 30 miles by boat. A 15-foot tide is required for float plane access, and a 13-foot tide is required for boat access. At lower tides, there is up to a 2-mile hike along the tide flat to the cabin. Castle Flats 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.
Campground entrance
Google Maps APICommunity
#community · posts, photos & Q&A · AI-moderated (Claude Vision)Pro tips
- Book on recreation.gov exactly 6 months ahead at 10am ET — Tongass National Forest fills fast in peak season.
- Check current road conditions at Tongass National Forest before arrival — seasonal closures common.
- Bear country — store all food in bear boxes or locked vehicle at all times.
Frequently asked questions
RIDB facts + intel · FAQPage schema, speakableHow much does Castle Flats Cabin cost per night?+
What season is Castle Flats Cabin open?+
Does Castle Flats Cabin have hookups?+
What is the maximum RV length at Castle Flats Cabin?+
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Official resources
●Data sources on this page
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