When campgrounds open for booking.

90 percent of campsites released six months in advance on the first of each month at 10 am Eastern; remaining 10 percent released at 10 am 14 days ahead of arrival on a rolling basis. Cross-checked against NPS Acadia camping page.

90 percent of campsites released six months in advance on the first of each month at 10 am Eastern; remaining 10 percent released at 10 am 14 days ahead of arrival on a rolling basis. Cross-checked against NPS Acadia camping page.

90 percent of campsites released six months in advance on the first of each month at 10 am Eastern; remaining 10 percent released at 10 am 14 days ahead of arrival on a rolling basis. Cross-checked against NPS Acadia camping page.

Released 5 months in advance in one-month blocks on the 15th of each month at 7 am Pacific (e.g., Jan 15 release covers arrivals May 15-Jun 14). Confirmed on Recreation.gov facility page for Upper Pines (API 232447).

Released 5 months in advance in one-month blocks on the 15th of each month at 7 am Pacific (e.g., Jan 15 release covers arrivals May 15-Jun 14). Confirmed on Recreation.gov facility page for Upper Pines (API 232447).

Blocks released on the 15th of each month at 7 am PT (Recreation.gov facility page). SOURCE CONFLICT on window length: Recreation.gov facility rules state a 5-month window; the NPS Yosemite camping page states half of sites release 2 months ahead on the 15th and half on a 2-week rolling window (post-rehabilitation). See booking-windows report.

Released 5 months in advance in one-month blocks on the 15th of each month at 7 am Pacific (e.g., Jan 15 release covers arrivals May 15-Jun 14). Confirmed on Recreation.gov facility page for Upper Pines (API 232447).

Released 5 months in advance in one-month blocks on the 15th of each month at 7 am Pacific (e.g., Jan 15 release covers arrivals May 15-Jun 14). Confirmed on Recreation.gov facility page for Upper Pines (API 232447).

Released 5 months in advance in one-month blocks on the 15th of each month at 7 am Pacific (e.g., Jan 15 release covers arrivals May 15-Jun 14). Confirmed on Recreation.gov facility page for Upper Pines (API 232447).

Duck Harbor (Isle au Haut): entire season released at once on April 1 at 10:00 am ET (2026 season: first night Jun 19, last night Oct 5). Next release Apr 1 2027 assumed from the annual pattern stated on the NPS Acadia camping page.