TL;DR: Thirteen closures and eighteen advisories across nine parks are currently active, with hard closures on Grand Canyon's North Kaibab Trail, Hawaii's summit trails, and Yosemite fire-area trails shaping fall travel.
Why this closure round matters now
According to Active trail closures & advisories - It's a Trail Day, thirteen active closures and eighteen advisories are posted across nine parks, with closures listed first and lower-severity advisories underneath.
That hub states that National Park Service alerts and state Department of Natural Resources advisories are refreshed every two hours.
According to Active Park Alerts: 652 Advisories, Closures Nationwide · Survival Backpack, a separate national dashboard counted 652 active advisories and 165 full closures across 54 states and territories on Oct. 17, 2026.
The same national overview explains that the National Park Service Active Alerts in Parks page pulls notices directly from individual park websites and was last updated Sept. 15, 2026.
The National Park Service system uses four labels, with Danger describing an imminent hazard, Closure describing an area that is inaccessible, Caution describing a possibly hazardous situation, and Information describing something that may affect visitor plans, according to Active Park Alerts: 652 Advisories, Closures Nationwide · Survival Backpack.
Rock Creek Park: marathon, turf work and facility closures
Oct. 25 parkway shutdown for race
According to Active trail closures & advisories - It's a Trail Day, Rock Creek and Potomac Parkway will be temporarily closed between Virginia Avenue and Shoreham Drive on Sunday, Oct. 25 from 5 a.m. to 1 p.m. to accommodate the Marine Corps Marathon.
The notice advises motorists to plan accordingly and use alternate routes during that closure.
Meridian Hill, Waterside Drive and nature center
The upper-level grass panels at Meridian Hill Park will be temporarily closed from Oct. 13 through Nov. 9, 2026, for restoration work and public safety, with fencing and signage marking the closure, according to Active trail closures & advisories - It's a Trail Day.
The upper plaza, other portions of Meridian Hill Park, and nearby park areas will remain open, although access to the turf areas will be restricted.
The planned Waterside Drive NW roadway closure has been temporarily postponed after crews discovered a large early-1900s utility line during preliminary excavation.
The construction team is evaluating the line to determine necessary steps before work can safely proceed, a precaution intended to minimize disruptions and avoid unnecessarily extending the roadway closure.
The Nature Center and Planetarium building is closed until further notice due to continued remediation, with visitors directed to check the park calendar for changes to ranger programs and locations.
Fort Totten Park munitions investigation
Part of Fort Totten Park remains closed for public safety east of Fort Totten Drive, south of Gallatin Street/Metropolitan Branch Trail and north of Brookland Avenue NE/Farragut Street.
The closure follows an investigation involving two World War I-era munitions found in the area.
George Washington Memorial Parkway: lanes, events and long detours
Tree work and cycling event
According to Active trail closures & advisories - It's a Trail Day, northbound George Washington Memorial Parkway lanes between Spout Run and Route 123 are closed Monday through Thursday from 9:30 a.m. to 2:30 p.m. for tree maintenance through Nov. 6.
Southbound closures are expected Nov. 9, with drivers told to follow posted detours and allow extra travel time.
The Clara Barton Parkway will close temporarily on Oct. 24, 2026, for the 2026 BellRinger Cycling Event.
That closure will begin at 6 a.m. for authorized traffic-control staging and is anticipated to end at approximately 11 a.m., limited to the period necessary to safely accommodate participants.
Road damage, sewer repair and bridge work
Beginning Oct. 8, one lane both northbound and southbound near River Farm Drive will be closed 24 hours a day and seven days a week for four weeks to repair an upheaval in the road.
A separate temporary closure affects 3,500 feet of the right travel lane at Site 17 on Clara Barton Parkway, covering managed land between the parkway and the Chesapeake and Ohio Canal and between Lock 10 parking lot north to Lock 14.
That action addresses ongoing safety concerns from a District of Columbia Water emergency sanitary sewer bypass and pipe repair.
Beginning Nov. 17, 2025, intermittent traffic impacts were scheduled for bridge and pavement preservation work expected to extend into fall 2026, covering repairs to 24 parkway bridges and more than 30 paved roads and parking assets.
To minimize traffic impacts, weekday lane closures on George Washington Memorial Parkway, Clara Barton Parkway and Spout Run Parkway will not be allowed inbound toward Washington from 5:30 a.m. to 9:30 a.m. and outbound from 2:30 p.m. to 7 p.m. Monday through Friday.
Mount Vernon Trail detour through 2030
Due to constriction for the Long Bridge Project, the Mount Vernon Trail will be temporarily detoured around the construction zone beginning July 15, 2026.
Trail users should expect periodic crossings of equipment and materials where the trail meets the construction access road.
The detour will remain in place through 2030.
Shenandoah: backcountry and Appalachian Trail limits
Naked Creek and Bearfence restrictions
According to Active trail closures & advisories - It's a Trail Day, the Naked Creek backcountry zone is closed to all recreation until further notice because of recent wildlife interactions.
A camping closure remains in effect for the Appalachian Trail from Lewis Mountain to Big Meadows, including the Bearfence Appalachian Trail Hut.
The Appalachian Trail remains accessible to hikers for day use only in that segment.
Emergency phone and Old Rag parking
Shenandoah National Park's emergency phone number 1-800-732-0911 is currently unavailable, and visitors are directed to dial 911 for all emergencies.
Effective May 4, infrastructure enhancements began at the Old Rag Trailhead main parking lot, with completion expected by November 2026.
Until then the main parking lot is closed to all vehicle and pedestrian traffic, while visitors can use existing overflow parking lots and day-use tickets remain required from March 1.
Grand Canyon North Rim: trail and road windows
North Kaibab hard closure into February
According to North Kaibab Trail Access Changes Begin October 15 for Transcanyon Waterline Project Work - Grand Canyon National Park, a section of North Kaibab Trail closed to all public access at 11:59 p.m. on Oct. 15, 2026, for pipeline rehabilitation on the Transcanyon Waterline.
The closure area lies between Redwall Bridge, about 2.5 miles north of Manzanita Rest Area, and the northern end of Cottonwood Campground.
The agency states the hard closure will remain through approximately February 2027, with no alternative routes or detours available through that section.
The closure is described as necessary to protect visitors and work crews operating in a narrow corridor with heavy equipment and active construction.
Cottonwood Campground will remain open, with backcountry reservations available through Recreation.gov, although water at Cottonwood Campground was turned off beginning Oct. 15 and backcountry users should plan to treat creek water.
The remainder of North Kaibab Trail was expected to stay open, from the trailhead south to Redwall Bridge and from Phantom Ranch north to the northern end of Cottonwood Campground.
Cape Royal, Point Imperial and seasonal services
According to Modified Fall Operations Begin at Grand Canyon's North Rim Oct. 15 - Grand Canyon National Park, modified fall operations began Oct. 15, with Cape Royal Road and Point Imperial Road temporarily closed from sunset Oct. 15 through sunrise Nov. 3, 2026.
That closure supports road repair and rehabilitation work with the Federal Highway Administration and maintains a safe work environment for crews.
The North Kaibab Trail remained closed in its entirety following the Aug. 29 flash flood, which caused extensive damage to trail, bridges and other infrastructure in Bright Angel Canyon.
The North Rim Backcountry Information Center closed for the season at noon Oct. 15, while backcountry permits remained available at the South Rim center and online through Recreation.gov.
The General Store closed at 4 p.m. Oct. 15, 2026, the North Rim Campground closed the morning of Oct. 16, 2026, and the North Rim gas station had closed Sept. 19, leaving no fuel available within the park.
The North Rim entrance gate on State Route 67 will close at sunset Nov. 30, 2026, or after the first major snowstorm, whichever comes first.
Visitors traveling before the gate closes should prepare for winter driving, while nearby lodging, food and fuel are available about 45 miles north at Jacob Lake, with additional accommodations in Fredonia, Arizona, and Kanab, Utah.
Hawaii and Yosemite: volcano and fire responses
1.3-mile summit closure at Kilauea
According to Uncertainty at Kilauea Summit Prompts Safety Closures in Hawai'i Volcanoes National Park, Halema'uma'u Trail and part of Byron Ledge Trail closed by 5 p.m. Wednesday, Oct. 7, for a total of 1.3 miles.
The action followed continued inflation and increased seismicity at Kilauea summit, with more than 200 shallow earthquakes below the summit in the prior week and six more in the prior 24 hours.
A magnitude 3.4 earthquake at 9:52 p.m. Sept. 30 caused small rockfalls along the north wall of the caldera.
The park warned that both trails descend from the caldera rim to the floor and have been the site of dangerous rockfalls, while additional cracks had opened between Uekahuna and Wahinekapu, likely from a short-lived magma intrusion Sept. 30 to Oct. 1.
The last eruption had occurred Aug. 25, and the 43 days since then represented the longest period without fountains since the eruptive cycle began Dec. 23, 2024.
Visitors are required to stay out of closed areas and away from cliff edges that are unstable and can collapse without warning.
Dome Fire operations and trail footprint
According to Dome Fire Update, October 7, 2026 - Yosemite National Park, the Dome Fire stood at 6,815 acres, 41% contained, with 875 personnel assigned.
Mule trains hauled meals, water, fuel, generators, lanterns, drip torches and other equipment into remote areas, reducing demand on air operations and allowing helicopters to focus on water-dropping missions.
Glacier Point Road was closed because of reduced visibility from smoke and to allow firefighting operations, with reopening planned when conditions allow.
The Four Mile Trail and Panorama Trail providing access to Glacier Point remained open to hikers, while all trails within the active fire footprint were closed, including all south- and eastbound trails accessed from Glacier Point Road.
Buena Vista Trail remained closed, Alder Creek Trail was open north to Deer Camp Trailhead, and Chilnualna Falls Trail was open from the trailhead east to Chilnualna Fall and Crescent Lake.
Fire restrictions were in effect below 8,000 feet because of high fire danger.
West Coast county and British Columbia notices
San Mateo County listings show Weiler Ranch Trail closed through Sunday, Oct. 25, for tree work from Oddstad Boulevard to Valley View Trail, while the northern San Andreas segment of Crystal Springs Regional Trail is closed through Nov. 2 for water-line repairs.
The same county source lists Oct. 19-31 closures on Homestead and Pomponio Canyon trails, Oct. 20-27 culvert work on Alambique, Loop and Meadow trails, and Oct. 22-27 closure on Edgewood Trail near the day-use area.
In British Columbia, the southern lagoon trail at Montague Harbour Marine Park is closed because of an unstable bank, with Gray Peninsula loop access available only by the northern route.
Gruchy's Beach Trail at Lakelse Lake Park is prone to flooding from Williams Creek, while the Juan de Fuca Marine Trail is closed between Bear Beach and Chin Beach because of slope failure with no alternate route available.