Campsite Sniper
Maine · Recreation.gov

Seawall Campground

44.2411° N / 68.3051° W · Data Sep 18 2026, checked hourly
Next open date Sep 20Next open weekend Sep 25346 detected openings this week178 monitored sites

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Every site at Seawall Campground, colored by availability across the tracked window. Tap a site for its calendar.
Seawall Campground

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Booking reality
Campsite Sniper detected 346 site openings here in the last 7 days
Set a free alert →
01 · Detected Opening History · the openings record · file CS-234674

When Seawall Campground reopens

Seawall Campground's openings record: every site-date Campsite Sniper detected turning available, logged and time-stamped. Refreshed hourly.
Openings · last 7 days
346
Openings · last 30 days
499
Openings · last 90 days
507

Weekday pattern

Detected openings by day of week · 90d
020406080100120877110392464761MONTUEWEDTHUFRISATSUNOPENINGS RECORDED · LAST 90 DAYS · N = 507

No strong weekday pattern is evident in the openings Campsite Sniper has detected: 507 openings spread across the week.

Hour-of-day pattern

First detected by hour · local time · last 90 days
04080120160200171000408121620HOUR OF DAY (24H) · ET · LAST 90 DAYS

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.

Lead-time profile

Days before stay date · percentiles
P25 · 8.5DMEDIAN · 14 DAYS OUTP75 · 16D0306090120150180DAYS BEFORE STAY DATE

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.

Highest-churn sites

Most openings · 90d
SiteOpeningsShare of all openings
C40  183.6%
D24  153.0%
D16  153.0%
D22  142.8%
D23  142.8%

Site C40 had the most detected openings in the last 90 days: 18. One free watch covers every site here.

02 · Availability Outlook · Sep 18, 2026 – Mar 19, 2027 · of 178 monitored sites

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).

Where the open windows are

91.6% of tracked site-nights are not currently open for online reservation. 1,339 of 15,889 remain open; here is where they are.

Load status

Sep 18, 2026 – Mar 19, 2027
Not open online91.6%
Open site-nights1,339 / 15,889
Reserved (of online inventory)2,731 / 4,070
Weekday openings956
Weekend openings383

Of the open site-nights on mapped sites, 956 fall on weekdays and 383 on weekends (Fri–Sun).

Open dates by month

Sep 2026 – Mar 2027
01,0002,0003,0004,0007056340 OPEN0 OPEN0 OPEN0 OPEN0 OPENSEPOCTNOVDECJANFEBMARSOLID = OPEN SITE-NIGHTS · DASHED OUTLINE = TOTAL BOOKABLE

November shows no online availability. 0 of 2,190 tracked site-nights are open there — 2,190 unavailable.

Holiday windows

Sites open per night · of 178 sites
WindowNightSites openStatus
Labor DaySAT Sep 50None open
SUN Sep 60None open
MON Sep 70None open
ThanksgivingTHU Nov 260None open
FRI Nov 270None open
SAT Nov 280None open
ChristmasTHU Dec 240None open
FRI Dec 250None open
New YearTHU Dec 310None open
FRI Jan 10None 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.

Best-availability sites

Most open site-nights · tracked window
SiteOpen 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.

Next windows

As of Sep 18, 2026 snapshot
Next open dateSun · Sep 20
Next open weekendFri · Sep 25
November0 of 2,190 · unavailable

The next bookable night is Sep 20; the first open weekend starts Sep 25. Campsite Sniper can watch later dates for you.

Stays and site detail

1,339 open site-nights across 145 sites at Seawall Campground, from the same hourly snapshot as everything above.

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.

Showing 60 of 145 sites with current availability
SiteMax RVHookupsOpen site-nightsLongest runDates
D1620 ftNone2222 nightsSep 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
D2220 ftNone2222 nightsSep 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
D2420 ftNone2222 nightsSep 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
D1820 ftNone2116 nightsSep 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
D1920 ftNone2115 nightsSep 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
D2320 ftNone2116 nightsSep 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
D1420 ftNone1914 nightsSep 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
D2020 ftNone1815 nightsSep 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
D3420 ftNone1812 nightsSep 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
D5220 ftNone1812 nightsSep 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
D1320 ftNone178 nightsSep 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
D4520 ftNone1711 nightsSep 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
D4620 ftNone176 nightsSep 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
D6120 ftNone176 nightsSep 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
D7320 ftNone1712 nightsSep 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
G315 ftNone1712 nightsSep 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
D1520 ftNone168 nightsSep 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
D2720 ftNone166 nightsSep 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
D3220 ftNone166 nightsSep 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
D5620 ftNone1612 nightsSep 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
D6320 ftNone165 nightsSep 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
D6620 ftNone1612 nightsSep 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
D6820 ftNone1612 nightsSep 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
D7620 ftNone165 nightsSep 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
D7820 ftNone165 nightsSep 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
D8220 ftNone165 nightsSep 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
D8320 ftNone166 nightsSep 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
D8920 ftNone1613 nightsSep 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
D9020 ftNone1610 nightsSep 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
A3420 ftNone158 nightsSep 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
B1720 ftNone1512 nightsSep 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
D4920 ftNone1510 nightsSep 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
D5020 ftNone155 nightsSep 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
D5320 ftNone1512 nightsSep 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
D6420 ftNone1511 nightsSep 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
D7720 ftNone155 nightsSep 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
D8420 ftNone155 nightsSep 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
G115 ftNone158 nightsSep 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
B1620 ftNone149 nightsSep 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
D2820 ftNone145 nightsSep 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
D3320 ftNone146 nightsSep 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
D3920 ftNone145 nightsSep 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
D4020 ftNone146 nightsSep 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
D4220 ftNone145 nightsSep 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
D4420 ftNone145 nightsSep 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
D5920 ftNone145 nightsSep 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
D7120 ftNone146 nightsSep 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
D7920 ftNone146 nightsSep 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
D9820 ftNone145 nightsSep 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
G415 ftNone145 nightsSep 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
A1720 ftNone138 nightsSep 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
D4120 ftNone1311 nightsSep 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
D4320 ftNone135 nightsSep 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
D4820 ftNone135 nightsSep 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
D6220 ftNone135 nightsSep 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
D6520 ftNone135 nightsSep 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
D6720 ftNone135 nightsSep 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
D7220 ftNone136 nightsSep 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
D9220 ftNone136 nightsSep 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
G215 ftNone135 nightsSep 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

About Seawall Campground

Overview

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.

Recreation

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.

Facilities

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.***

Natural Features

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.

Nearby Attractions

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.

178 monitored sitesRVs up to 35 ftNo hookups170 shadedPets OKFire pitsMax party 20

Getting there

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.

The Campground Cannot Process Mail. If You Need To Receive Mail, It'S Best To Have It Sent To "General Delivery" At A Nearby Post Office.207-244-3600 - F.A.Q.S = (GO.NPS.GOV/ACADIACAMPING)
CampingInterpretive ProgramsRanger Station

View on Recreation.gov ↗   Get directions ↗

FAQ

How do I get a reservation at Seawall Campground?

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.

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.

How often do new openings appear at Seawall Campground?

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.

Can I get a multi-night stay at Seawall Campground?

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.

Which sites at Seawall Campground fit a 35-foot RV?

14 of the 178 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 35 ft.

Which month has the most availability at Seawall Campground?

September 2026, with 705 open site-nights in the current snapshot of 2,314.

How far ahead of a stay do openings appear at Seawall Campground?

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.

When is the next open date at Seawall Campground?

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.

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