Underrated National Parks in the USA to Visit in August

When most travelers think of a summer trip to a national park, the same names usually come to mind — Yellowstone, Yosemite, or the Grand Canyon. And while these iconic parks are breathtaking, they’re also packed with tourists in August. Long lines at entrances, crowded trails, and sold-out campgrounds can quickly turn a dream trip into a stressful experience.

But here’s the good news: the United States is home to more than 400 national park sites, and many of them remain hidden gems. These underrated parks offer just as much beauty and adventure as the famous ones — without the overwhelming crowds. From alpine peaks to volcanic landscapes, remote islands to star-filled skies, there are plenty of lesser-known destinations waiting to be explored in August.

In this guide, we’ll highlight some of the best underrated national parks in the USA to visit in August. Whether you’re looking for cooler mountain escapes, peaceful hiking trails, or budget-friendly getaways, these hidden gems are perfect for a late-summer adventure.

Why Visit Underrated National Parks in August? 

August is one of the busiest months for travel in the United States. Families are wrapping up summer vacations, and many international travelers are still exploring popular destinations before fall begins. Most travelers head to well-known destinations like Yellowstone or Yosemite (featured in our 20 Places Every North American Should Visit Before They Die guide), but these underrated parks offer just as much beauty with fewer crowds.

Choosing underrated national parks gives you the opposite experience. Instead of waiting in traffic or struggling to find a parking spot at a trailhead, you can enjoy wide-open spaces and quiet trails. Fewer crowds also mean better chances of spotting wildlife, easier campsite reservations, and more affordable lodging in nearby towns.

Another big advantage is the weather. Many of these hidden-gem parks, especially those in the mountains or northern states, offer cooler temperatures in August. While the desert Southwest may feel scorching, parks like North Cascades in Washington or Isle Royale in Michigan provide refreshing summer escapes.

On top of that, visiting lesser-known parks helps distribute tourism more evenly, supporting smaller communities that don’t always benefit from the national park boom. So not only do you get a more relaxed and affordable adventure — you’re also contributing to sustainable travel.

1. North Cascades National Park (Washington)

Often called the “American Alps,” North Cascades National Park is one of the most stunning yet least visited parks in the U.S. Despite its dramatic peaks, turquoise lakes, and over 300 glaciers, it sees only a fraction of the visitors compared to Yellowstone or Yosemite.

Why August is the Best Time to Visit:
In spring, snow often blocks trails and roads, but by August, most areas are fully accessible. The weather is warm but not scorching, with daytime highs averaging between 70–80°F, making it perfect for hiking. This is also when wildflowers bloom across the alpine meadows, creating postcard-worthy views.

Top Things to Do:

• Hike the Maple Pass Loop, one of the most scenic trails in the Pacific Northwest.

• Visit Diablo Lake for kayaking, canoeing, or just enjoying its famous jade-green waters.

• Explore the North Cascades Highway (State Route 20), a breathtaking drive open in summer months.

Travel Tips:

• Unlike many national parks, there’s no entrance fee, making it a budget-friendly option.

• Lodging is limited inside the park, so many visitors stay in nearby towns like Winthrop or Marblemount.

• Cell service is limited — download maps ahead of time.

Helpful Links:

• Official Park Website: National Park Service – North Cascades

• Trail & Route Info: Washington Trails Association

2. Lassen Volcanic National Park (California)

If you’ve ever dreamed of experiencing the geothermal wonders of Yellowstone without the overwhelming crowds, Lassen Volcanic National Park in Northern California is the perfect August destination. This park is home to steaming fumaroles, boiling springs, and mud pots — all set against a backdrop of volcanic peaks and crystal-clear lakes.

Why August is the Best Time to Visit:
Lassen is located at higher elevations, so much of the park is still snow-covered well into early summer. By August, nearly all the trails and roads are open, giving you full access to its volcanic landscapes. The weather is pleasantly warm during the day, with cool nights ideal for stargazing — and Lassen is recognized as one of the best places for night skies in the continental U.S.

Top Things to Do:

• Hike the Bumpass Hell Trail to see colorful geothermal features up close.

• Take in panoramic views from the summit of Lassen Peak (a strenuous but rewarding hike).

• Enjoy a picnic or paddle at Manzanita Lake, which reflects Lassen Peak beautifully at sunset.

• Attend the Dark Sky Festival (usually held in August), featuring astronomy talks and telescope viewings.

Travel Tips:

• Arrive early for popular trails like Bumpass Hell to avoid limited parking.

• The park is remote — the nearest major town is Redding, about an hour away.

• Bring layers: even in August, temperatures can drop into the 40s at night.

Helpful Links:

• Official Park Website: National Park Service – Lassen Volcanic

• Hiking Trails: AllTrails – Lassen Volcanic

3. Black Canyon of the Gunnison National Park (Colorado)

Dramatic, rugged, and almost otherworldly, Black Canyon of the Gunnison National Park is one of Colorado’s most underrated treasures. The park is named for its incredibly steep, narrow gorge carved by the Gunnison River — some sections of the canyon receive only 33 minutes of sunlight a day, giving it its “black” appearance.

Why August is the Best Time to Visit:
By August, the weather is warm but comfortable, with highs around the 80s and cooler evenings. Unlike Colorado’s more famous parks like Rocky Mountain or Mesa Verde, Black Canyon remains relatively uncrowded, even in peak summer. This makes August an ideal time for peaceful sightseeing, hiking, or photography without competing for space on trails.

Top Things to Do:

• Drive the South Rim Road, which offers 12 jaw-dropping overlooks into the canyon.

• Hike the Warner Point Nature Trail for panoramic views of both the canyon and surrounding mountains.

• For experienced adventurers, descend into the inner canyon (permits required).

• Stargaze — the park is a certified International Dark Sky Park, offering some of the clearest night skies in the U.S.

Travel Tips:

• Services are limited inside the park, so bring water, food, and fuel before arriving.

• The South Rim is the most accessible for first-time visitors, while the North Rim offers a quieter, more remote experience.

• Wildlife is active in the summer — keep an eye out for mule deer, golden eagles, and peregrine falcons.

Helpful Links:

• Official Park Website: National Park Service – Black Canyon of the Gunnison

• Scenic Drives & Overlooks: Colorado Tourism – Black Canyon

4. Isle Royale National Park (Michigan)

For travelers seeking a true wilderness escape, Isle Royale National Park is unlike any other destination in the U.S. Located in the middle of Lake Superior, this remote island park is only accessible by ferry or seaplane, making it one of the least-visited national parks — yet one of the most unforgettable.

Why August is the Best Time to Visit:
The park’s short season means it’s only open from mid-April to late October, but August is the sweet spot. The weather is mild (highs in the 70s, cooler at night), the waters are calmer for ferry crossings, and the notorious summer bugs have mostly disappeared. With its isolation and pristine environment, Isle Royale offers peace and solitude you won’t find in busier parks.

Top Things to Do:

• Backpack along the Greenstone Ridge Trail, which stretches 40 miles across the island.

• Go kayaking or canoeing on the crystal-clear waters of Lake Superior.

• Explore historic sites like the Rock Harbor Lighthouse and old copper mining remnants.

• Spot wildlife — Isle Royale is famous for its ongoing wolf and moose populations, studied by scientists for decades.

Travel Tips:

• No cars are allowed on the island — be prepared to hike, paddle, or use water taxis.

• Reservations for ferries or seaplanes fill up quickly, especially in August, so book well in advance.

• Services are very limited; pack all essentials and be ready for backcountry conditions.

Helpful Links:

• Official Park Website: National Park Service – Isle Royale

• Ferry & Transportation Info: Isle Royale Ferry Services

5. Great Basin National Park (Nevada)

Tucked away in eastern Nevada, Great Basin National Park is one of the country’s best-kept secrets. Here, you’ll find snowcapped peaks, ancient bristlecone pine forests, marble caves, and some of the darkest night skies in the U.S. Despite its incredible diversity, the park welcomes fewer than 100,000 visitors a year, making it a true hidden gem.

Why August is the Best Time to Visit:
Summers in Nevada can be scorching, but Great Basin’s high elevation keeps temperatures comfortable in August, especially at Wheeler Peak, which towers over 13,000 feet. Trails that are often snowbound in spring are clear by late summer, offering full access to alpine lakes and rugged mountain scenery. Plus, August is a prime month for stargazing, with meteor showers often lighting up the skies.

Top Things to Do:

• Hike the Wheeler Peak Trail for sweeping views of the Great Basin Desert.

• Explore the underground wonders of Lehman Caves on a guided tour.

• Visit groves of bristlecone pines, some of the oldest living trees in the world.

• Attend a ranger-led astronomy program — the park is a certified International Dark Sky Park.

Travel Tips:

• Bring layers — daytime can be warm, but temperatures drop sharply at night.

• Advance reservations are recommended for Lehman Caves tours.

• Services are minimal; the nearest town, Baker, is very small, so stock up before arriving.

Helpful Links:

• Official Park Website: National Park Service – Great Basin

• Astronomy Programs: Great Basin Observatory

Tips for Planning an August Trip to Underrated Parks 

Visiting lesser-known national parks in August is rewarding, but a little planning goes a long way to make the most of your trip. Here are some essential tips:

1. Book Early — Even for Hidden Gems
While underrated parks see fewer visitors than famous ones, August is still peak travel season. Campgrounds, ferries (like those for Isle Royale), and guided tours (such as Lehman Caves in Great Basin) can sell out weeks or even months in advance. Reserve early to avoid last-minute stress.

2. Prepare for Variable Weather
Many of these parks are at high elevations or in northern regions, meaning temperatures can swing dramatically. Pack layers — lightweight clothing for daytime hikes, but also jackets or fleeces for chilly evenings. Don’t forget rain gear, as summer storms can pop up unexpectedly.

3. Bring Supplies
Smaller parks often have limited services compared to major ones. Gas stations, grocery stores, and restaurants may be miles away. Stock up on essentials before arriving, and always carry extra water and snacks.

4. Stay Safe in Remote Areas
Cell service is often unreliable. Download offline maps and let someone know your itinerary. In parks with wildlife, like North Cascades and Isle Royale, carry bear spray if recommended and follow park safety guidelines.

5. Check Local Events
Some parks host special summer events, like stargazing festivals at Lassen and Great Basin. These experiences can add a unique touch to your trip.