National Park Service
Near Southwest Harbor, Maine: $22–$30/night, rigs to 35 ft. Open Late May through September. Book 2 months ahead via Recreation.gov.
National Park Service
Managing authority
Near Southwest Harbor, Maine
How much does camping at Seawall Campground (Acadia NP) cost, and when is it open?
Seawall Campground (Acadia NP) near Southwest Harbor, Maine (National Park Service) — camping fee $22–$30/night, season Late May through September, RV size limit Up to 35 ft. Reservations: 2 months ahead via Recreation.gov — book direct through the official channel.
The numbers
Fee range
$22–$30/night
Season open
Late May through September
RV size limit
Up to 35 ft
Reservation window
2 months ahead via Recreation.gov
The insider read
Quieter Mount Desert Island west-side option. Bass Harbor Head Lighthouse 10-min drive (the Acadia photo). Walk-in tent loop is the rare quiet on busy weekends.
Original analysis from PickRV — synthesised from public sources you can verify, pulling the operational details competitor guides typically skip.
Verify at nps.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 recreation.gov
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 Millinocket
StateInsider tip · Mount Katahdin base camp — final stop on the Appalachian Trail. Knife-Edge route from camp is 9 miles + 4,000-ft gain; not for beginners. Baxter is unique: no RVs, no pets, no cell service, no internet booking widget — only phone/mail.
Near Edmunds Township
StateInsider tip · Easternmost camp in the US. Tidal range here is 24 ft — the highest in the lower 48. Bald eagle nesting Apr-Aug; bring binoculars. Quiet alternative to crowded Acadia.
Near Casco
StateInsider tip · Deepest lake in Maine (300 ft) — crystal-clear water. Closest large state-park camp to Portland (45 min). Books out July weekends 4 months early; check daily for cancellations.
Near Freeport
PrivateInsider tip · Oceanfront RV + glamping on a non-profit organic farm. Walk to Freeport L.L. Bean flagship (15 min). Lobster pound on-site weekends; book a campfire lobster dinner.
Nearby & related
Sourced costs, campground directories, and the places worth a detour — the next layer of Maine trip planning.
Before you go
Maine rules
Verified 2026-05-10