The camping limit at a national park is usually counted across the entire park and across your whole season, not per campground and not per trip. That is the opposite of how most people read it, and it is why a reader who books four campgrounds for two nights each can be over the limit before they arrive at the third one.
There is no National Park Service number. Each park writes its own and publishes it on its own camping page. Here are three, all read on August 23, 2026, and no two of them work the same way.
Three parks, three structures
Rocky Mountain is the tightest. Its camping page says that from May 1 through October 15 you can camp in the park 7 nights total parkwide, and it gives the worked example itself: three nights at one campground on one trip plus four nights at another on a second trip uses the whole summer season. You get an additional 14 nights between November 1 and April 30.
Glacier changes its number on a holiday. Its camping information page limits camping in the park to 14 days between July 1 and Labor Day, and 30 days between Labor Day and June 30, and specifies that both count “either in a single period or combined separate periods.” Labor Day is September 7 this year, so Glacier’s ceiling more than doubles in two weeks.
Grand Teton stacks a per-campground limit inside an annual one. Its camping page sets 7 days per person at Jenny Lake and 14 days at every other campground, with a hard cap of no more than 30 days in the park per year.
What none of them is
None of these is the 14-day federal rule people carry around from BLM and Forest Service land. That number comes from a different agency under different regulations, and importing it into a park is how you end up short a night. If you want the public-land version of the question, we wrote up why a national forest stay limit comes from a posted order rather than a nationwide number.
The honest gap
Yellowstone’s campgrounds page publishes opening and closing dates, fees, site counts and rig length limits, and no stay limit at all. We are not going to infer one from its neighbors. If you are planning a long Yellowstone stay, call the park and get the number from a person before you book.
What to do
Before you book more than a few nights in one park, open that park’s own camping page and look for the words “parkwide,” “per year,” or a date range attached to the limit. Any of the three changes the arithmetic. If the page is silent, treat it as unknown and call.
Then read the sign at the campground and listen to the host. The posted rule and the ranger’s current guidance beat any website, this one included. For how stay limits work on the free public land around the parks, start with our stay limits guide.