Recreation.gov Booking Windows 2027: When Campsites Release (Exact Times)
Most Recreation.gov campsites open 6 months before arrival at 7am PT / 10am ET, but not all. Time-zone table, park exceptions (Yosemite, Acadia), and a 5-step plan.
The most common national park camping mistake isn't picking the wrong campground. It's showing up late. Most campsites on Recreation.gov are bookable six months before arrival, the best ones go on the first morning, and the National Park Service says so itself: at Assateague Island, "nearly all reservations for weekends are filled the first day that they become available."
This post is about timing only: the standing rule, the exact release hour in every US time zone, and the exceptions that catch people out. For where to go once you have a site, see National Parks: which ones live up to the hype.
The Core Facts
Recreation.gov Booking Windows: What You Need to Know
- Standard window: most campsites can be booked six months before your arrival date
- Standard release hour: most campgrounds go on sale at 7am PT / 8am MT / 10am ET, "but not always"
- Who sets the window: each facility. Check the Seasons and Booking (or Seasons and Fees) tab on the campground page
- Known exceptions: Yosemite's valley campgrounds open five months out on the 15th of each month; Acadia's Blackwoods, Seawall and Schoodic Woods release 90% of sites on the 1st of each month at 10am ET
- Before release day: log in, make sure your password and contact details are current, and sync your clock
Last verified: November 2026, against the Recreation.gov and NPS pages cited below
What the Rule Actually Is
Recreation.gov's own booking-tips article states the default plainly: "most campsites can be booked six months prior to your arrival date," and "some locations offer shorter booking windows in addition to the standard six-month booking window." (Recreation.gov: tips for making campsite reservations at popular locations)
Two details matter more than the headline number.
The window belongs to the facility, not the website. Recreation.gov's FAQ says "booking windows are determined by each individual facility," and that a window is counted in days, weeks or months before the earliest date you can reserve. (Recreation.gov FAQ) So six months is the common case, not a law. Treat it as the thing you verify, not the thing you assume.
The release hour is "most", not "all". The same booking-tips article says "most campgrounds go on sale at 7am PT/8am MT/10am ET, but not always," and tells you to check the campground's Seasons and Fees tab for the specific time and date.
The release hour in US time zones
| Time Zone | Standard Release |
|---|---|
| Pacific (PT) | 7:00 AM |
| Mountain (MT) | 8:00 AM |
| Central (CT) | 9:00 AM (derived from the MT and ET figures) |
| Eastern (ET) | 10:00 AM |
If a campground's tab shows a different hour, the campground's tab wins.
Doing the date math
A six-month window means a given arrival date opens for booking on the same calendar date six months earlier. Arriving July 15 means you are at the screen on January 15. The edge cases are the ends of months (there is no February 31), so for any arrival on the 29th to 31st, confirm the open date on the campground page rather than counting on your fingers.
Where the Standard Rule Breaks
These are the exceptions worth knowing, each taken from the park's own page.
| Campground | Window | Release | Source |
|---|---|---|---|
| Yosemite: Upper Pines, Lower Pines, North Pines, Wawona, Hodgdon Meadow | Five months ahead, released on the 15th of each month | 7 am PT | NPS Yosemite |
| Yosemite: Tuolumne Meadows | Half the sites two months ahead on the 15th; half on a rolling two-week window | 7 am PT | NPS Yosemite |
| Yosemite: Bridalveil Creek, Crane Flat, Tamarack Flat, White Wolf, Yosemite Creek, Porcupine Flat | Two weeks ahead, rolling daily (14 days before arrival) | 7 am PT | NPS Yosemite |
| Yosemite: Camp 4 | One week ahead, rolling daily (7 days before arrival) | 7 am PT | NPS Yosemite |
| Acadia: Blackwoods, Seawall, Schoodic Woods | 90% of sites released six months ahead, on the 1st of each month | 10 am ET | NPS Acadia |
| Acadia: the other 10% | Rolling, 14 days before arrival | 10 am ET | NPS Acadia |
| Acadia: Duck Harbor | Whole season released on April 1 | 10 am ET | NPS Acadia |
Yosemite's exceptions have their own guide: Yosemite campground reservations: the 15th-of-the-month rule.
Acadia's monthly blocks are the clearest example of why "six months" can mislead. NPS's own examples: reservations for May open December 1 at 10 am ET, and June reservations open January 1 at the same time. A May 31 arrival does not open on November 30. It opens with the rest of May, on December 1. (NPS Acadia news release, which is archived; the live camping page above carries the current rule.)
Glacier shows the opposite problem. NPS says "some sites are available to reserve a few days in advance and some are available a few months in advance," and the page does not publish one window for all eight reservation campgrounds. For parks like that, the campground's own Recreation.gov listing is the only source. (NPS Glacier)
Your Action Plan
- Find the window before you pick the dates. Open the campground's Recreation.gov page and read the Seasons and Booking tab. It states the window and the release time for that facility.
- Convert the release hour to your clock. Write the local time on the calendar entry, not "10am". Yosemite's 7 am PT is 10 am ET.
- Count back from your arrival date, then back-check on the page. Six months for the standard window, the fixed monthly date for blocks like Acadia and Yosemite's valley campgrounds.
- Prep the account the day before. Recreation.gov advises that existing users ensure their password and contact information are current. Log in early.
- Sync your clock and be ready to refresh. Recreation.gov tells you to sync to its clock (which it ties to Coordinated Universal Time). NPS Yosemite says the same: "be sure your clock is set accurately."
If you miss out, NPS Yosemite's advice applies broadly: keep checking for cancellations.
Related Guides
- Yosemite campground reservations: the 15th-of-the-month rule -- the exact release table for the valley campgrounds
- National Parks: which ones live up to the hype -- which parks are worth the booking effort
- Best time to visit -- pick the season before you pick the date
- Packing list tool -- once the site is booked
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Plan Your TripFrequently Asked Questions
When do Recreation.gov campsites open?
For most campgrounds, six months before the arrival date, at 7am PT / 8am MT / 10am ET. Recreation.gov says this is the standard but adds "not always": individual facilities set their own windows and times, shown on the Seasons and Booking tab of each campground page.
What time do Recreation.gov reservations open?
Most campgrounds go on sale at 7am Pacific, which is 10am Eastern, per Recreation.gov's booking tips. Yosemite releases at 7 am Pacific and Acadia at 10 am Eastern, per their NPS pages.
How far in advance can you book a campsite on Recreation.gov?
Most campsites can be booked six months ahead, but the window is set per facility and can be counted in days, weeks or months. Yosemite's valley campgrounds use five months, and several Yosemite campgrounds open only two weeks or one week ahead.
Is the Recreation.gov window the same at every national park?
No. NPS pages for Yosemite, Acadia and Glacier each describe a different mix of windows. Acadia releases 90% of sites on the first of each month and the last 10% 14 days before arrival.
Do weekend campsites really sell out the first day?
At least in some parks, yes. NPS says of Assateague Island: "nearly all reservations for weekends are filled the first day that they become available." For Yosemite NPS says all non-lottery reservations "sell out within minutes."
What if I miss the release?
Keep checking for cancellations, which is NPS Yosemite's own advice, and look at campgrounds with shorter rolling windows, which release new dates every day.
Sources: Recreation.gov booking tips, Recreation.gov FAQ, NPS Yosemite camping, NPS Acadia camping, NPS Acadia news release, NPS Glacier reservation campgrounds, NPS Assateague campgrounds and reservations. Rules change; confirm on the campground's Recreation.gov page before you set an alarm.
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