Pick a site on the map to see its availability calendar.
No strong weekday pattern is evident in the openings Campsite Sniper has detected: 507 openings spread across the week.
The largest concentrations of detected openings were first detected during the 08:00 and 09:00 local-time hours. Those hours contained 214 of 507 detected openings (42.2%). Hours show when Campsite Sniper first detected each opening, in Eastern Time, not when the change was made upstream.
Half of the openings Campsite Sniper detected appeared at least 14 days before the stay date; the middle 50% land 8.5–16 days out. Set an alert if you want Campsite Sniper to monitor future openings.
| Site | Openings | Share of all openings |
|---|---|---|
| C40 | 18 | 3.6% |
| D24 | 15 | 3.0% |
| D16 | 15 | 3.0% |
| D22 | 14 | 2.8% |
| D23 | 14 | 2.8% |
Site C40 had the most detected openings in the last 90 days: 18. One free watch covers every site here.
Of the 15,889 tracked site-nights (Sep 18, 2026 – Mar 19, 2027): 1,339 open for online reservation · 2,731 reserved · 202 closed · 11,617 unavailable (cause unspecified).
Of the open site-nights on mapped sites, 956 fall on weekdays and 383 on weekends (Fri–Sun).
November shows no online availability. 0 of 2,190 tracked site-nights are open there — 2,190 unavailable.
| 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 | 0 | None open | |
| Christmas | THU Dec 24 | 0 | None open |
| FRI Dec 25 | 0 | None open | |
| New Year | THU Dec 31 | 0 | None open |
| FRI Jan 1 | 0 | None open |
Labor Day: no online availability on any tracked night. Thanksgiving: no online availability on any tracked night. Christmas: no online availability on any tracked night. New Year: no online availability on any tracked night.
| Site | Open site-nights |
|---|---|
| D16 | 22 |
| D22 | 22 |
| D24 | 22 |
| D18 | 21 |
| D19 | 21 |
The 5 sites with the most open site-nights in the current snapshot. Pair a bookable date with a free alert to cover everything else.
The next bookable night is Sep 20; the first open weekend starts Sep 25. Campsite Sniper can watch later dates for you.
Multi-night stays. 224 2-night, 199 3-night, 38 7-night openings where a single site is free for every night, per Campsite Sniper's current snapshot — soonest Sep 20 at site D16.
RV length. Longest recorded site here is 35 ft. 30 sites take 25 ft, 14 sites take 35 ft.
| Site | Max RV | Hookups | Open site-nights | Longest run | Dates |
|---|---|---|---|---|---|
| D16 | 20 ft | None | 22 | 22 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +10 more |
| D22 | 20 ft | None | 22 | 22 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +10 more |
| D24 | 20 ft | None | 22 | 22 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +10 more |
| D18 | 20 ft | None | 21 | 16 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2 +9 more |
| D19 | 20 ft | None | 21 | 15 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2 +9 more |
| D23 | 20 ft | None | 21 | 16 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2 +9 more |
| D14 | 20 ft | None | 19 | 14 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4 +7 more |
| D20 | 20 ft | None | 18 | 15 nights | Sep 20, Sep 21, Sep 22, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +6 more |
| D34 | 20 ft | None | 18 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +6 more |
| D52 | 20 ft | None | 18 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +6 more |
| D13 | 20 ft | None | 17 | 8 nights | Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6 +5 more |
| D45 | 20 ft | None | 17 | 11 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4 +5 more |
| D46 | 20 ft | None | 17 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4 +5 more |
| D61 | 20 ft | None | 17 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4 +5 more |
| D73 | 20 ft | None | 17 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +5 more |
| G3 | 15 ft | None | 17 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4 +5 more |
| D15 | 20 ft | None | 16 | 8 nights | Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +4 more |
| D27 | 20 ft | None | 16 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 4 +4 more |
| D32 | 20 ft | None | 16 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 5 +4 more |
| D56 | 20 ft | None | 16 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +4 more |
| D63 | 20 ft | None | 16 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +4 more |
| D66 | 20 ft | None | 16 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +4 more |
| D68 | 20 ft | None | 16 | 12 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2 +4 more |
| D76 | 20 ft | None | 16 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +4 more |
| D78 | 20 ft | None | 16 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +4 more |
| D82 | 20 ft | None | 16 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5 +4 more |
| D83 | 20 ft | None | 16 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5 +4 more |
| D89 | 20 ft | None | 16 | 13 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +4 more |
| D90 | 20 ft | None | 16 | 10 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5 +4 more |
| A34 | 20 ft | None | 15 | 8 nights | Sep 21, Sep 22, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7, Oct 8 +3 more |
| B17 | 20 ft | None | 15 | 12 nights | Sep 22, Sep 23, Sep 24, Sep 30, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5, Oct 6, Oct 7, Oct 8 +3 more |
| D49 | 20 ft | None | 15 | 10 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5 +3 more |
| D50 | 20 ft | None | 15 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 4, Oct 5 +3 more |
| D53 | 20 ft | None | 15 | 12 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1 +3 more |
| D64 | 20 ft | None | 15 | 11 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 5 +3 more |
| D77 | 20 ft | None | 15 | 5 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 5, Oct 6 +3 more |
| D84 | 20 ft | None | 15 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6 +3 more |
| G1 | 15 ft | None | 15 | 8 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Oct 1, Oct 2, Oct 3, Oct 4, Oct 5 +3 more |
| B16 | 20 ft | None | 14 | 9 nights | Sep 23, Sep 24, Sep 29, Sep 30, Oct 1, Oct 3, Oct 4, Oct 5, Oct 6, Oct 7, Oct 8, Oct 9 +2 more |
| D28 | 20 ft | None | 14 | 5 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5, Oct 6, Oct 7 +2 more |
| D33 | 20 ft | None | 14 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5 +2 more |
| D39 | 20 ft | None | 14 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5, Oct 6 +2 more |
| D40 | 20 ft | None | 14 | 6 nights | Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5, Oct 6, Oct 7 +2 more |
| D42 | 20 ft | None | 14 | 5 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6 +2 more |
| D44 | 20 ft | None | 14 | 5 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 5, Oct 6, Oct 7 +2 more |
| D59 | 20 ft | None | 14 | 5 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6 +2 more |
| D71 | 20 ft | None | 14 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5 +2 more |
| D79 | 20 ft | None | 14 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5, Oct 6 +2 more |
| D98 | 20 ft | None | 14 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 5, Oct 6, Oct 7 +2 more |
| G4 | 15 ft | None | 14 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6 +2 more |
| A17 | 20 ft | None | 13 | 8 nights | Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7, Oct 8, Oct 9, Oct 10 +1 more |
| D41 | 20 ft | None | 13 | 11 nights | Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 26, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4 +1 more |
| D43 | 20 ft | None | 13 | 5 nights | Sep 21, Sep 23, Sep 24, Sep 25, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 6, Oct 7, Oct 8 +1 more |
| D48 | 20 ft | None | 13 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 5, Oct 6, Oct 7 +1 more |
| D62 | 20 ft | None | 13 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 28, Sep 29, Sep 30, Oct 4, Oct 5, Oct 6, Oct 7 +1 more |
| D65 | 20 ft | None | 13 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 7 +1 more |
| D67 | 20 ft | None | 13 | 5 nights | Sep 20, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 4, Oct 5, Oct 6, Oct 8 +1 more |
| D72 | 20 ft | None | 13 | 6 nights | Sep 21, Sep 24, Sep 25, Sep 27, Sep 28, Sep 29, Sep 30, Oct 1, Oct 2, Oct 5, Oct 6, Oct 7 +1 more |
| D92 | 20 ft | None | 13 | 6 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 25, Sep 28, Sep 29, Sep 30, Oct 1, Oct 6, Oct 7 +1 more |
| G2 | 15 ft | None | 13 | 5 nights | Sep 20, Sep 21, Sep 22, Sep 23, Sep 24, Sep 27, Sep 28, Sep 29, Oct 1, Oct 5, Oct 6, Oct 7 +1 more |
For Seawall campsites, 90 percent of campsites are released six months in advance on the first of each month at 10 am EST. The remaining 10 percent are released at 10 am 14 days ahead of a desired arrival date on a rolling basis. For example, if you plan to arrive on May 24, you can make an online reservation starting at 10 am EST Dec 1 from the first release or starting at 10 am EST on May 10 from the second release. All campsite reservations must be made through recreation.gov.
90% of campsites are available six months in advance, and released on a monthly basis as described above. 10% of campsites are available at 10:00 a.m. EST. fourteen (14) days in advance of the desired reservation date. Visitors are able to make same day reservations if campsites are available. All reservations must be made through recreation.gov. Reservations cannot be made through the campground office or in-person.
From gentle walks along the rugged coastline, mountain hikes, tree lined carriage roads for biking and lakes for kayaking and canoeing, Acadia offers many opportunities to get outside and be active.
Park rangers at Acadia offer a variety of programs to suit every interest and activity level. Programs include walks, talks, hikes, narrated boat cruises, bike rides and more. Kids age 6-12 love Acadia's Junior Ranger Program.
A 27-mile, historic loop road system offers outstanding views of the park's ocean shoreline, coastal forests and mountain silhouettes.
The majority of this family-oriented campground's sites are for small and large tents; some sites can accommodate RVs up to 35 ft. in length. Maneuvering RVs in the campground can be very difficult. Seawall Campground was not designed to accomodate large RVs and trailers. Please read campsite details and warnings carefully before reserving a site. Accommodations cannot be made for RVs or trailers that do not fit in reserved sites.
Flush toilets, running water and a dump station are provided, as are picnic tables and fire rings. Roads are paved. A picnic area is located on the shore across from the campground entrance.
***Fee shower facilities and camping supply stores are located 1 mile from the campground. There are no showers in the campground. The use of portable showers is prohibited.***
Southwest Harbor is located on the west side of Mount Desert Island. The west side of the Island is considered the "quiet side" of Mount Desert Island. All the sites at Seawall Campground are wooded and within a 10-minute walk to the ocean. There are many beautiful and quiet hiking trails on this side of the Island, as well as Echo Lake, a wonderful lake for swimming, fishing, canoeing, kayaking and picnics. Acadia is comprised of a cluster of islands on the Atlantic coast of Maine. Mountains, lakes, streams, wetlands, forests, meadows and beaches are all found within roughly 50,000 acres comprising Acadia.
Acadia National Park is surrounded by scenic island harbors and quaint towns. Mount Desert Island, the Schoodic Peninsula, and Isle au Haut offer plenty of visitor services including restaurants, shops, museums, and tours. Please check with local Chambers of Commerce for more information.
From Boston, take I-95 north to Augusta, Maine, then Route 3 east to Ellsworth and on to Mount Desert Island. For an alternate route, continue on I-95 north to Bangor, Maine, then take Route 1A east to Ellsworth. In Ellsworth, take Route 3 to Mount Desert Island. At first traffic light on Mount Desert Island, bear right onto Route 102. Stay on 102 for approximately 11.5 miles. You will pass through Somesville and the town of Southwest Harbor. As you leave Southwest Harbor, keep right on Route 102 and travel through Bass Harbor. You will pass through Bass Harbor and keep left onto 102A. Campground approximately 2.4 miles. Campground entrance is on the left. Note: Detour in place.
View on Recreation.gov ↗ Get directions ↗












Reservations for Seawall Campground are made through Recreation.gov. 91.6% of tracked site-nights are not currently open for online reservation; 1,339 of 15,889 remain open. Campsite Sniper has also detected 507 site openings here in the last 90 days, so further dates may appear. 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.
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
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.
Campsite Sniper detected 346 site-date openings at Seawall Campground in the last 7 days, 499 over 30 days and 507 over the last 90.
199 three-night openings are showing, counting only runs where the SAME site is free for all three nights. The soonest starts Sep 20 at site D16. Confirm and book on Recreation.gov.
14 of the 178 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 35 ft.
September 2026, with 705 open site-nights in the current snapshot of 2,314.
Half of the openings Campsite Sniper detected appeared at least 14 days before the stay date; the middle 50% landed 8.5-16 days out. Campsite Sniper can monitor future changes for dates you select.
As of the Sep 18, 2026 snapshot: the next open date is Sun, Sep 20 and the next open weekend starts Fri, Sep 25. Detected openings can add earlier dates at any time; a free Campsite Sniper alert catches those the moment they appear.
Lakefront, hookups, your RV length, weekends only - set it as picky as you want.
We run paced availability checks for Seawall Campground. 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.