As the last days of summer slowly transition into the cooler embrace of fall, September is an ideal time to explore America’s national parks. The crowds of peak season have thinned, the weather is pleasant, and the landscapes are transformed by the early signs of autumn. If you’re looking to squeeze in one more adventure before the end of the year, here are five national parks that are at their best in September.
1. Great Smoky Mountains National Park (Tennessee/North Carolina)
Why visit in September?
Highlights: Early fall colors, misty mountain views, wildlife spotting
September marks the start of fall foliage season in the Smokies, with higher elevations beginning to show splashes of red, yellow, and orange. The crisp air makes hiking comfortable, and wildlife like black bears and elk are more active. For a scenic drive, the Roaring Fork Motor Nature Trail offers incredible views, while hikes like Alum Cave Trail or the Chimney Tops provide iconic Smoky Mountain vistas.
Pro Tip: Beat the October leaf-peeping crowds by coming in mid to late September. The morning fog creates an ethereal, picture-perfect atmosphere over the valleys.
2. Yosemite National Park (California)
Why visit in September?
Highlights: Perfect hiking weather, fewer crowds, waterfalls
In September, Yosemite’s waterfalls may not be at their peak flow, but the cooler temperatures and smaller crowds make it an ideal time for hiking and rock climbing. The iconic granite formations like Half Dome and El Capitan shine in the golden autumn light, and hikes to Glacier Point or Vernal Fall offer stunning views.
Pro Tip: Campgrounds and lodging are much easier to book compared to the summer months. September is also great for stargazing, with fewer visitors and clearer skies.
3. Rocky Mountain National Park (Colorado)
Why visit in September?
Highlights: Aspen trees turning gold, wildlife migrations, cooler hikes
September in Rocky Mountain National Park is the start of the elk rutting season, when you can hear the eerie, echoing bugle of male elk in the crisp morning air. Aspen trees turn a dazzling gold against the rugged mountain peaks, making scenic drives like the Trail Ridge Road absolutely breathtaking.
Pro Tip: Take an early morning or late afternoon drive along Bear Lake Road for the best wildlife sightings. Dress in layers—temperatures can swing from chilly mornings to warm afternoons.
4. Acadia National Park (Maine)
Why visit in September?
Highlights: Coastal beauty, quieter trails, lobster season!
Acadia in September is a coastal dream. The summer crowds have gone, but the weather is still pleasant enough to explore the park’s rugged shoreline and scenic viewpoints. Hike up Cadillac Mountain for sunrise or take a leisurely bike ride along the park’s historic carriage roads. Afterward, enjoy a fresh Maine lobster in nearby Bar Harbor.
Pro Tip: September is prime for visiting without the congestion. Sunrise at Cadillac Mountain offers one of the first views of the sunrise in the U.S.—perfect for early risers.
5. Zion National Park (Utah)
Why visit in September?
Highlights: Ideal temperatures for hiking, fewer crowds, stunning canyons
As the desert heat starts to ease up, September becomes one of the best months to explore Zion’s incredible landscapes. The cooler weather makes hikes like Angels Landing and The Narrows much more enjoyable. The park’s iconic red rock formations glow under the soft autumn light, creating unforgettable photo opportunities.
Pro Tip: September still sees some crowds, but they’re far more manageable than summer. Start your hikes early to beat the heat and take advantage of the quieter trails.
Ready to explore?
September is a magical time to visit these parks, offering a mix of tranquil beauty, cooler weather, and unique seasonal events. Whether you’re chasing fall foliage in the Smokies or enjoying the golden aspens in Rocky Mountain, you’re in for an unforgettable adventure. Pack your hiking boots, camera, and sense of wonder, and let September guide you to some of America’s most beautiful natural landscapes!
