Four days. That’s the notice you’re getting on this one. This Thursday, September 17, is Constitution Day, and the National Park Service is waiving entrance fees at more than 100 fee-charging sites: Yellowstone, Yosemite, Grand Canyon, Zion, all of it. No advance booking window, no lead time to build a trip around it the way you can with Memorial Day or the Fourth of July. It’s just suddenly this week.

If you already read our post on August’s fee-free day for the NPS’s 110th birthday, the residency rule underneath this one will sound familiar. It’s the same rule, and it’s still catching people off guard three weeks later. What’s actually new to talk about here isn’t the waiver itself. It’s how little runway you have to use it, and one park on this list where “free entry” and “fully open” aren’t the same thing right now.

Quick Verdict: NPS Fee-Free Day, September 17, 2026

Detail	Info
What’s free	Standard entrance fees, waived at 100+ fee-charging sites
Why September 17	Constitution Day, anniversary of the Constitution’s 1787 signing
Who qualifies	U.S. citizens and residents only (new for 2026)
Who doesn’t	International visitors: full entrance fee applies, plus the $100 nonresident surcharge where it’s in effect
Normally costs	Up to $35 per vehicle, 7-day pass
Still full price	Camping, backcountry permits, shuttle tickets, boat launches, guided tours
Days left in 2026 after this	Two: Oct. 27 and Nov. 11
Watch for	Grand Canyon South Rim: entrance is open, but water restrictions and hotel closures from the August flood haven’t lifted

In one sentence: National parks waive the gate fee nationwide on September 17 for Constitution Day, but 2026 is the first year that waiver excludes international visitors, who still owe full price, including the $100-per-person nonresident surcharge at the parks where it applies.

What Is Constitution Day, and Why Do National Parks Close the Gate for Free?

Constitution Day marks September 17, 1787 — the day delegates in Philadelphia signed the document that created the federal government as we know it. It’s not a federal holiday in the sense of a day off work, but it’s been a recognized commemorative date for decades, and NPS has folded it into its annual fee-free calendar for years as a way to get more people through the gate on a patriotic date that otherwise passes quietly. In 2026, it’s one of exactly 10 days when the agency waives its own entrance fees.

That’s the whole idea in one sentence: for one day, the $20–35 vehicle fee that gets you into a place like Zion or Grand Teton disappears, no coupon, no reservation, no catch — unless you’re not a U.S. citizen or resident, which is the part this year’s version of the rule complicates.

The Fee-Free Days Left in 2026

Constitution Day is the seventh of 10 fee-free dates on this year’s calendar. Six are already behind us:

1. February 16: Presidents Day
2. May 25: Memorial Day
3. June 14: Flag Day
4. July 3–5: Independence Day weekend
5. August 25: NPS’s 110th anniversary
6. September 17: Constitution Day (this week)
7. October 27: Theodore Roosevelt’s birthday
8. November 11: Veterans Day

After Thursday, only two are left this year. If you miss this one and the parking-lot math still appeals to you, Theodore Roosevelt’s birthday in late October and Veterans Day in November are the remaining shots, both with considerably more lead time to plan than this week gave anyone.

The Part Most Roundups Are Skipping: Who Actually Qualifies

Here’s the fine print that separates this year from every fee-free day before it. Starting in 2026, under a Department of the Interior policy shift toward what it’s branding as more affordable access for U.S. residents, fee-free days apply only to U.S. citizens and residents. International visitors get no waiver at all on September 17 — they pay the standard entrance fee exactly as they would on any other Thursday.

It goes further than that, too. At the 11 national parks that charge a nonresident surcharge (Yellowstone, Yosemite, Grand Canyon, Zion, Glacier, Grand Teton, Acadia, Bryce Canyon, Everglades, Rocky Mountain, and Sequoia & Kings Canyon), that surcharge still applies too. It’s $100 per person, aged 16 and older, charged on top of the (non-waived) vehicle fee. A couple visiting Zion from outside the U.S. this Thursday pays the full $35 vehicle fee plus $200 in surcharges ($235 total) on the one day domestic visitors pay nothing.

Practically, that means rangers at the gate may ask anyone 16 or older for ID to confirm residency before waving them through free. A driver’s license, U.S. passport, or green card works. If you’re a U.S. resident, bring one anyway. It’s a new habit worth building for every fee-free day going forward, not just this one. If someone in your group isn’t a citizen or permanent resident, don’t plan around the free entry applying to them. It won’t.

What Does the Fee-Free Day Not Cover?

Even for the visitors who do qualify, “fee-free” means exactly one thing: the standard vehicle or per-person gate fee. Everything else NPS and its concessioners charge for keeps charging on September 17. Specifically:

1. Camping and backcountry permits: no discount, no waiver, book and pay as usual.
2. Shuttle tickets, including systems like Glacier’s ticketed shuttle on Going-to-the-Sun Road.
3. Boat launches and river permits: full price.
4. Guided tours and concessioner-run activities: unaffected by the gate waiver.
5. Timed-entry reservation processing fees, at the handful of parks still running them.

So if your plan is Zion on Thursday, the shuttle into the canyon still costs what it costs, and if you drew a permit for Angels Landing, that permit fee still applies regardless of what’s happening at the entrance gate. The waiver saves you one line item (the gate fee) and nothing downstream of it.

One Park Where “Free” Doesn’t Mean “Normal”

Worth flagging before anyone books a Thursday trip to the Grand Canyon specifically: the South Rim entrance gate is open and the fee waiver applies there like everywhere else, but the park is still working through water system repairs after an August 29 flash flood tore out the aging Transcanyon pipeline. Stage 4 water restrictions are still active, South Rim hotels remain closed, and Phantom Ranch is shut through at least September 30. None of that touches the entrance fee waiver. Day access is open, and it’s free Thursday for qualifying visitors, but if the plan involves a room inside the park or a rim-to-rim hike, check that post first. Free entry to a park with no place to sleep isn’t the win it sounds like.

Is It Worth Rearranging a Trip Around This?

Honestly, mostly no: not on four days’ notice, and not for $35. If you already had a park trip on the calendar for this week, sure, enjoy the free gate; it’s a real if modest savings, and it stacks fine with whatever else you’d already booked. But this isn’t the fee-free day to reroute a flight for. The lead time isn’t there, the crowds at marquee parks tend to tick up on any fee-free date (domestic visitors, at least, show up in bigger numbers when the gate’s free), and unlike August 25’s National Park Week programming, Constitution Day doesn’t come bundled with extra ranger talks or events to make the trip worth building around on its own.

Where it does matter: if you’re a U.S. resident already planning to be near Yellowstone or another fee-charging park this week regardless, there’s no reason not to time your entrance for Thursday. Free is free. Just bring ID. It won’t apply to anyone in your group who isn’t a citizen or resident, and the gate fee was never the expensive part of the trip anyway.

The Bottom Line

September 17 waives the one fee that was already the smallest line item in a national park trip, and it does it with almost no warning and, for the first time, a real exclusion built in. U.S. residents get through free at over 100 sites. International visitors pay exactly what they’d pay any other day, surcharge included at the 11 parks where that applies. Everything besides the gate (camping, permits, shuttles, tours) was never on the table to begin with.

Two fee-free days remain after this one: October 27 and November 11. Both come with more notice than this one did, which, if the short runway here bothered you, is worth putting on the calendar now instead of finding out four days out again.

Full 2026 fee-free schedule and residency rules: nps.gov/orgs/1207/presidents-day-2026.htm. Nonresident fee details: nps.gov/aboutus/nonresident-fees.htm.

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Fee-free day and residency rule details per NPS’s 2026 fee-free days announcement and Interior Department policy announcement. Information current as of September 13, 2026. Confirm your specific park’s hours and any active closures directly at nps.gov before visiting.