August 2026 gives park travelers two fee-free entrance days — August 4, the Great American Outdoors Act anniversary, and August 25, the National Park Service's 110th birthday — and a National Park Week moved from its traditional April slot to August 22–30, per the National Park Service. For anyone with a late-summer trip on the calendar, the month's timing math just changed.
This publication reports calendar news for trip planners; remember that the 2026 fee-free waiver applies to U.S. citizens and residents only, per the NPS entrance-passes policy, and covers entrance fees but not camping or tours.
Why did National Park Week move to August?
The celebration now anchors on the agency's own birthday: the National Park Service was founded on August 25, 1916, so 2026 marks its 110th year, per the NPS. The 2026 National Park Week runs August 22–30, bracketing the anniversary, replacing the April scheduling of prior years. Per the NPS, entrance fees are waived on August 25 for U.S. citizens and residents at the roughly 106 parks that normally charge. In practical terms, expect the busiest late-August weekend of the year at marquee parks — the waived gate draws visitors who would otherwise pay, and the week's programming adds ranger events and family activities to the usual summer traffic.
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What was the August 4 fee-free day?
August 4 marked the anniversary of the Great American Outdoors Act, the 2020 law that funds maintenance backlogs and land acquisition through energy-development revenues, and the NPS waived entrance fees for the day, per its free-entrance calendar. If you missed it, the next resident-only waiver dates after August 25 in the 2026 calendar fall later in the fall — which makes the two August windows the last summer-peak free entries of the year.
How to plan the last weeks of summer
- Chase value, not just the waiver: if you hold an annual pass you pay nothing anyway — pick August 26 instead of August 25 and trade the queue for a quiet trail.
- Book the edges of Park Week: lodging and campsites near big parks are tightest for the August 22–30 stretch; shoulder dates before August 22 are looser.
- Factor fire season: August is peak smoke season in the West; check air quality and the park's alerts page before committing.
- Check your park's event schedule: birthday programming varies by unit — some parks run evening talks and family walks during Park Week.
Conditions change — check with the managing agency before you go.