As the summer crowds thin out and the temperatures cool, September is the perfect time to explore some of America’s most stunning yet often overlooked national parks. While iconic parks like Yellowstone and Yosemite are well-known, the U.S. is home to several underrated national parks that offer just as much natural beauty without the throngs of tourists. These off-the-beaten-path parks are ideal for those seeking a serene escape in nature, breathtaking landscapes, and unique experiences.
By choosing to visit these underrated parks in September, you’ll not only enjoy fewer crowds, but you’ll also be treated to crisp air, golden foliage, and an unparalleled connection to the wilderness. From the dramatic mountain peaks of North Cascades to the rugged canyons of the Great Basin, here’s why these hidden gems should be on your radar for your next September adventure.

If you’re ready to explore less-traveled roads and experience true solitude in nature, read on for the top underrated national parks to visit in September.
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North Cascades National Park: A Hidden Alpine Wonderland
Tucked away in northern Washington, North Cascades National Park is one of the most underrated national parks in the U.S. Often called the “American Alps,” this park is renowned for its rugged mountain terrain, glacial peaks, and pristine alpine lakes. In September, the park comes alive with the early signs of autumn, as larch trees turn gold and the crisp mountain air makes for perfect hiking conditions.
Hiking the Alpine Lakes and Peaks
North Cascades offers some of the best hiking in the Pacific Northwest, with trails that lead to stunning alpine lakes and panoramic views of jagged peaks. Popular hikes include the Maple Pass Loop and the Cascade Pass Trail, both of which offer breathtaking views of fall foliage and glacier-covered mountains. These trails are moderately challenging, making them accessible for most adventurers, and the September weather ensures comfortable hiking without the summer heat.

Wildlife Watching and Solitude
One of the biggest draws of North Cascades is the chance to experience true solitude in nature. With far fewer visitors than parks like Mount Rainier or Olympic, you’ll have a better chance of spotting wildlife such as black bears, mountain goats, and bald eagles. September is also the tail end of the summer season, so you can enjoy peaceful trails and campsites without the crowds.
Best Time to Visit and Travel Tips
September is an ideal time to visit North Cascades due to its milder temperatures and the beginning of fall foliage. While some higher-elevation areas may see early snow, the lower valleys remain accessible. Make sure to check local weather conditions and trail reports before heading out, and plan your trip to take advantage of the scenic drives along Highway 20, which cuts through the park and offers breathtaking views of the Cascade Mountains.
For those who prefer solo travel and want to explore quieter destinations like North Cascades, check out this guide: 10 Perfect Solo Travel Destinations in September for Unforgettable Adventures.
Great Basin National Park: A Desert Oasis with Ancient Trees
Located in eastern Nevada, Great Basin National Park is often overlooked due to its remote location, but it offers a unique desert landscape combined with alpine forests, ancient bristlecone pines, and the impressive Lehman Caves. This park’s diversity in ecosystems makes it a hidden gem for those looking to experience something different in September.
Exploring the Bristlecone Pines

Great Basin is home to some of the world’s oldest trees, the bristlecone pines, which can live for thousands of years. A hike to the Bristlecone Pine Grove allows you to see these ancient trees up close, offering a humbling experience as you walk among living relics of history. The Wheeler Peak trail, which ascends to the park’s highest point at over 13,000 feet, provides incredible views of these trees and the surrounding desert landscape.
Stargazing and Dark Skies
Great Basin is also one of the best places in the U.S. for stargazing, thanks to its remote location and lack of light pollution. In September, the skies are particularly clear, and the park often hosts Astronomy Nights, where visitors can use telescopes to view planets, stars, and galaxies. If you’re seeking an off-the-beaten-path experience, spending the night under the stars in Great Basin is unforgettable.
Underrated Park with Few Crowds
Despite its beauty, Great Basin remains one of the least visited national parks, which means you can enjoy its landscapes in peace. In September, the weather is ideal for hiking, camping, and exploring the park’s many wonders without the scorching summer heat. Whether you’re hiking up Wheeler Peak or delving deep into the Lehman Caves, you’ll find that Great Basin is full of surprises for the adventurous traveler.
Black Canyon of the Gunnison: Colorado’s Most Dramatic Canyon
While Colorado is famous for Rocky Mountain National Park, Black Canyon of the Gunnison National Park is an underrated gem that offers equally impressive landscapes with far fewer visitors. Known for its steep, narrow canyon walls and dramatic rock formations, this park is a must-visit for anyone looking to escape the crowds and experience Colorado’s wild beauty in September.
The Depths of the Canyon
The Black Canyon’s unique geology is what sets it apart from other parks. The canyon is carved by the Gunnison River, and its steep walls reach depths of over 2,700 feet, making it one of the deepest canyons in North America. September is the perfect time to visit, as the summer heat fades, and the cool canyon air makes hiking and sightseeing more enjoyable.

Top Activities for Adventurers
For those looking to explore the canyon up close, the South Rim Drive offers several overlooks where you can peer into the depths of the canyon. Hiking trails such as the Warner Point Nature Trail provide stunning views of the Gunnison River far below. More adventurous travelers can embark on the Inner Canyon Routes, which involve scrambling down the steep canyon walls to the river’s edge—though these routes are only recommended for experienced hikers.
An Undiscovered Colorado Gem
While the nearby Rocky Mountains attract the majority of visitors, Black Canyon of the Gunnison remains one of Colorado’s most underrated national parks. Its dramatic landscapes are perfect for September travel, offering a quieter and more intimate experience with nature. Whether you’re hiking along the rim or photographing the sheer canyon walls, this park provides a unique adventure for those seeking something beyond the usual tourist destinations.
Congaree National Park: A Hidden Wetland Wilderness
Located in South Carolina, Congaree National Park is a lush, subtropical wilderness often overshadowed by the more famous parks of the western U.S. However, this park offers a completely different ecosystem, with one of the largest old-growth bottomland hardwood forests in the country.
Exploring the Swamps and Boardwalks
Congaree is best known for its towering cypress trees and intricate swamp ecosystem, which you can explore via an extensive network of boardwalks and trails. The Boardwalk Loop is one of the most popular hikes, offering a peaceful walk through the park’s floodplain forest, with opportunities to spot wildlife such as otters, alligators, and various bird species. The cool September temperatures make this the perfect time to explore the park’s wetlands without the sweltering summer heat.

Kayaking and Canoeing Adventures
For a more immersive experience, kayaking or canoeing along the Congaree River is a fantastic way to see the park from a different perspective. Paddling through the swamp allows you to glide past ancient trees and observe the diverse wildlife up close. In September, the water levels are often ideal for kayaking, making it one of the best months to explore the park’s waterways.
A Peaceful, Off-the-Beaten-Path Park
Congaree’s unique landscape and relative obscurity make it an underrated national park that deserves more attention. Whether you’re hiking through the dense forest or paddling along the river, Congaree offers a peaceful escape into nature, far from the typical crowds. For those seeking a quieter adventure in the southeastern U.S., Congaree is a hidden treasure waiting to be discovered.
Conclusion
September is an ideal time to explore the underrated national parks scattered across the United States. From the alpine wilderness of North Cascades to the ancient trees of Great Basin and the dramatic cliffs of Black Canyon of the Gunnison, each of these parks offers a unique experience without the large crowds. As temperatures cool and the landscapes change, these parks provide the perfect backdrop for a serene and unforgettable September adventure.
Whether you’re an experienced hiker looking for new challenges or a traveler seeking peaceful solitude in nature, these underrated national parks offer something for everyone. So, pack your bags and embark on an off-the-beaten-path journey that will leave you with lasting memories of the natural beauty and diversity of America’s hidden gems.