Is there an entrance fee?

NPS lists Manhattan Project National Historical Park as a fee-free park with no entrance fee.

Where pets are allowed, NPS rules require a crate, a cage or a leash of six feet or shorter. NPS lists pets as permitted on 18 of its things to do here.

How many visitor centers are there?

NPS lists 4 visitor centers, in Hanford, Los Alamos, Oak Ridge and the Tri-Cities.

All parks › Manhattan Project National Historical Park

Manhattan Project National Historical Park: fees, hours, camping and when to visit

Updated October 30, 2026. Based on National Park Service data. Published by Humblebee.

Entrance fee: None^[1]
Busiest month (2025): July^[2]
Recreation visits, 2025: 56,390^[3]
Visitor centers: 4^[4]

Manhattan Project National Historical Park is a National Park System unit with parts in New Mexico, Washington and Tennessee^[5]. NPS lists it as a fee-free park with no entrance fee^[1].

Entrance fees and passes

The National Park Service lists no entrance fee for Manhattan Project National Historical Park^[1]. Some tours, campgrounds or permits inside a park can still have their own fees.

When to visit and hours

The park has units in Hanford, Los Alamos and Oak Ridge, so check local weather at each unit before you go^[6]. The Hanford Visitor Center is listed as open Monday to Friday, 9:00 AM to 4:00 PM^[7]. The Los Alamos Visitor Center lists Friday to Monday hours of 10 am to 3 pm^[8]. On Sundays, NPS lists limited services at the Oak Ridge Visitor Center^[9]. In 2025 the busiest month was July with 7,751 recreation visits^[2]. The quietest month was October with 297^[2].

Recreation visits counted by the National Park Service in each month of 2025. The busiest month, July, is highlighted^[2].

Show visits by month

Month, 2025	Recreation visits
January	3,375
February	3,729
March	6,610
April	5,321
May	6,991
June	6,407
July	7,751
August	5,915
September	4,649
October	297
November	2,260
December	3,085

Show visits by year

Year	Recreation visits
2021^[3]	26,063
2022^[3]	27,265
2023^[3]	60,100
2024^[3]	74,693
2025^[3]	56,390

Pets and dogs

Under the national NPS pet rule, where pets are allowed they must be kept in a crate or cage or held on a leash of six feet or shorter, and they are not allowed in public buildings^[10]. NPS lists pets as permitted on 18 of its 56 things to do here^[11]. Each park can close more areas to pets^[10].

Before you go

NPS lists no entrance fee here^[1].
Access to the Hanford B Reactor is listed as suspended due to major construction projects, so check for tour updates first^[7].
NPS lists reservations as required for 9 of the things to do^[11].
Visitor centers have listed closures around Thanksgiving Day 2026-11-26^[7]^[9].
Confirm hours on the official park page before a trip^[7].

Questions people ask

Is there an entrance fee?: NPS lists Manhattan Project National Historical Park as a fee-free park with no entrance fee^[1].
What is the busiest month?: In 2025 the busiest month was July with 7,751 recreation visits^[2].
Are dogs allowed?: Where pets are allowed, NPS rules require a crate, a cage or a leash of six feet or shorter^[10]. NPS lists pets as permitted on 18 of its things to do here^[11].
How many visitor centers are there?: NPS lists 4 visitor centers, in Hanford, Los Alamos, Oak Ridge and the Tri-Cities^[4].

Facts and sources

NPS lists Manhattan Project National Historical Park as a fee-free park: there is no entrance fee. National Park Service
NPS recreation visits by month, 2025 (chart on this page). NPS Visitor Use Statistics
NPS recreation visits per year: 2021: 26,063, 2022: 27,265, 2023: 60,100, 2024: 74,693, 2025: 56,390. NPS Visitor Use Statistics
Visitor centers listed by NPS: 4 (Hanford Visitor Center, Los Alamos Visitor Center, Oak Ridge Visitor Center, Tri-Cities Visitor Center). National Park Service
Manhattan Project National Historical Park is a unit of the U.S. National Park System (designation: National Historical Park) in New Mexico, Washington and Tennessee. National Park Service
NPS weather and seasons overview for Manhattan Project National Historical Park. National Park Service
Operating hours, Hanford Visitor Center: The Hanford Visitor Center is open Monday - Friday 9:00 AM-4:00 PM. Access to the Hanford B Reactor is suspended due to major construction projects. To check for updates about these tours, visit... National Park Service
Operating hours, Los Alamos Visitor Center: While there is currently no public access to the Department of Energy facilities in Los Alamos, walking tours are available in the town of Los Alamos. The Los Alamos Visitor Center is open Friday through Monday,... National Park Service
Operating hours, Oak Ridge Visitor Center: The Oak Ridge Visitor Center is located within the Children's Museum of Oak Ridge. Here you are able to speak with National Park Service rangers, watch a short film on the Manhattan Project, and get literature on... National Park Service
National Park Service rule 36 CFR 2.15: where pets are allowed they must be crated, caged or on a leash no longer than six feet at all times, and pets are not allowed in public buildings, on public transportation or on designated swimming beaches (service... eCFR, 36 CFR 2.15
NPS lists 56 things to do at Manhattan Project National Historical Park: Hanford: Bike and Walk the Sacagawea Heritage Trail, Hanford: Attend a B Reactor Tour, Los Alamos: Tour Behind the Fence, Oak Ridge: Join a Ranger Program, Oak Ridge: Experience a... National Park Service

Fees and hours are what NPS lists in its data at the snapshot date. They change: tell readers to confirm on the official park page before a trip. Visits are NPS recreation visits (counted entries, not unique people). Use them only for this park's own months and years, never to rank parks. Campground list and site counts come from NPS and Recreation.gov records. Count fields can differ slightly between the two. The pet rule is the national baseline (36 CFR 2.15). The park may close more areas to pets. Do not claim specific trails allow dogs unless a fact says so.