August is the last full month of summer, and that creates an interesting dynamic in the national parks. Families are squeezing in final trips before school starts. The high-altitude parks still have full access. And in Alaska, the bears are getting fat while fall foliage starts creeping in at northern latitudes. Crowds are still heavy, but at most parks they’re down 10 to 15% from the July peak.
Parks Featured in This Guide
14 parks mapped — click a pin for details
My top pick is Glacier National Park. I know the crowds are real. I know the vehicle reservation system is a hassle. But there is nothing quite like Going-to-the-Sun Road with every trail accessible and wildflowers still blooming at the higher elevations. The strategies below will help you beat the worst of it.
I’ve ranked these 15 parks best first with specific temps, crowd levels, and the caveats nobody else tells you. I also added parks to skip and a comment section at the bottom if you want to share your August experience.
1. Glacier National Park
Location: Montana
August Weather: Highs 70 to 80°F. Lows 40 to 50°F. Under 2 inches of rain.
Crowds: High, but down 10% from July peak. Vehicle reservations required 6 AM to 3 PM.
What’s Open: Going-to-the-Sun Road. All trails. All campgrounds.
What’s Closed: Nothing. Boat tours end mid-September, so August is safe.
Park Guide: Things to Do | Best Hikes | Our Itinerary | Facts
Why August: The one benefit over July is that crowds drop about 10%. We put together an itinerary to help you make the most of your time. Vehicle reservations are required 6 AM to 3 PM. They open 180 days ahead and again at 7 PM the night before.
Get there before 6 AM for parking and early trail access. Grinnell Glacier, Highline Trail, and Avalanche Lake will have crowds, but 700+ miles of other trails won’t. Consider wilderness camping for the absolute best way to beat the crowds.
The honest caveat: Wildfire smoke can roll in during August. Check air quality before hiking at elevation. Don’t rely on the shuttle system as your only access plan. Waits can hit an hour.
2. Voyageurs National Park
Death Valley. Average high near 114°F. Lows in the mid-80s. Lowest visitation of any month for good reason. Most trails should be done by 10 AM. Save it for winter.
Glacier National Park | Best National Parks to Visit in August (Shutterstock/Stephen Moehle)
Location: Minnesota
August Weather: Highs 70 to 80°F. Lows 50 to 60°F.
Why August: Prime fishing season across 218,000 acres of interconnected waterways. August nights are perfect for stargazing at this Dark Sky Park, with Northern Lights possible in late summer. Rent a houseboat or book a campsite accessible by boat for the ultimate Voyageurs experience.
Boat tours run for day and night events. Hidden coves, secluded beaches, and picturesque islands await those who explore by water.
The honest caveat: You need a boat to access most of the park. If you don’t own one, plan on renting a houseboat or booking a water taxi. This park requires more logistics than most.
3. Crater Lake National Park
Location: Oregon
August Weather: Highs mid-60s to mid-70s. Lows mid-40s to low 50s.
Crowds: High. About the same as July.
What’s Open: Everything. Rim Drive. Boat tours. Trolley rides. Cleetwood Cove Trail. Two campgrounds (one in old-growth forest).
Why August: The park gets 23 to 73 feet of snow annually, so the window for full access is short. August gives you Rim Drive with 30 overlooks, boat tours, and the Cleetwood Cove Trail to the water’s edge. Wildflowers grow even along the collapsed volcano rim.
The honest caveat: Wildfire smoke is a real August risk in southern Oregon. If you don’t stay inside the park, plan for a 20 to 35-mile drive each day.
4. Sequoia and Kings Canyon National Parks
“Is you gonna come visit me?” – The Seal, probably.
(Shutterstock/Sebastien Burel)
Location: California
August Weather: Lower areas mid-70s to mid-90s. Higher elevations mid-60s to low 80s. Lows 40 to 60°F depending on elevation.
Crowds: Medium. No timed entry required.
What’s Open: All roads (snow can close them through June or July some years). General Sherman Tree. General Grant Tree. Crystal Cave. Mount Whitney trailhead nearby.
What’s Closed: Nothing.
Park Guide: Sequoia Things to Do | Kings Canyon Things to Do | Best Hikes
Why August: Two parks, one entry fee, no timed entry. The world’s largest tree, the deepest canyon in the country (2,000 feet deeper than the Grand Canyon), and the tallest mountain in the contiguous US nearby. August guarantees all roads are open, which isn’t always the case even through June or July.
Explore Crystal Cave underground, hike the Congress Trail or Lakes Trail, and cool off at Tokopah Falls. Plan at least two days and arrive by 9 AM to score parking.
The honest caveat: The entrances are 45 miles of winding roads apart. Lodging inside the park books months ahead.
5. North Cascades National Park
Panorama View at the Cliff Palace in Mesa Verde. (Shutterstock-milosk50)
Location: Washington
August Weather: Highs 70 to 80°F. Lows 45 to 55°F.
Crowds: Low.
What’s Open: Full wilderness access. More glaciers than any contiguous US park. Waterfalls fueled by August warmth.
What’s Closed: Nothing.
Park Guide: Things to Do | Best Hikes | Facts
Why August: Alaska-level scenery without leaving the Lower 48. The park has more glaciers than any other in the contiguous US, and August warmth fuels deep canyon waterfalls. The wilderness is roadless by design, offering crowd-free beauty to those willing to hike for it. Sourdough Mountain Trail and Desolation Peak are bucket-list experiences.
The honest caveat: Not much comes easy here. No roads in the wilderness section, limited cell service, and limited facilities. This park rewards effort.
6. National Park of American Samoa
Location: American Samoa (South Pacific)
August Weather: Highs around 86°F. Lows 75 to 80°F. Part of the dry season, but still averages 19 rainy days.
Crowds: Low. The least populated national park in August (547 visits).
What’s Open: Everything. Snorkeling, diving, guided cultural programs.
What’s Closed: Nothing.
Park Guide: Facts
Why August: When you truly want to get away at an American national park, you can’t go further. Swimming, snorkeling, and diving among colorful coral reefs fill the days. Polynesian cultural programs provide a depth of experience no other park can match. August falls in the dry season.
The honest caveat: It’s a 5 hour 40 minute flight from Hawaii. No frills, limited infrastructure. Plan this as an extended trip, not a quick stop.
7. Carlsbad Caverns National Park
Location: New Mexico
August Weather: Highs around 91°F outside. Inside the cave: 56°F year-round. Lows around 64°F.
Crowds: Low. Crowds drop between July and October.
What’s Open:Timed cave tours. Bat flight peaks in August (free, no reservation). Above-ground trails.
What’s Closed: Nothing.
Park Guide: Things to Do | Facts
Why August: The caves are 56°F year-round, making them a welcome escape from 91°F surface heat. Bat activity peaks in August, and the nightly bat flight from the cave is free with no reservations needed. Schedule your cave tour during the hottest part of the day and hike above ground in the morning. Guadalupe Mountains National Park is just 30 minutes down the highway.
The honest caveat: The Big Room can hold six football fields, but timed entry still means planning ahead. Book cave tours early in your trip planning process.
8. Kenai Fjords National Park
Location: Alaska
August Weather: Highs 60 to 65°F. Lows 45 to 50°F.
Crowds: Medium. Second busiest month after July.
What’s Open: Harding Icefield Trail. Boat tours. Kayaking. Coastal public use cabins (boat or seaplane access only).
What’s Closed: Nothing.
Park Guide: Things to Do | Facts | Harding Icefield Trail
Why August: This land of towering glaciers and abundant wildlife changes every year as glaciers melt. August is ideal for the Harding Icefield Trail paralleling Exit Glacier. Consider staying in a coastal public use cabin, accessible only by boat or seaplane. Backcountry camping by kayak is an epic experience.
The honest caveat: Rain is frequent. Pack waterproof everything. Seward and Anchorage are within a 3-hour drive for supplies and lodging.
9. Rocky Mountain National Park
Lehman Caves | Things to Do in Great Basin National Park (Shutterstock/Irina K)
Location: Colorado
August Weather: Daytime highs around 73°F. Nighttime lows around 43°F. One of the drier months.
Crowds: High. Timed entry through October.
What’s Open: All park roads. Trail Ridge Road. All trails clear. Wildflowers peaking above 11,500 feet.
What’s Closed: Nothing.
Park Guide: Photo Guide | Sky Pond Hike | Facts
Why August: The Sky Pond Hike is one of my top three favorite hikes in the park system. August is peak wildflower season above 11,500 feet. All roads are open with virtually no chance of snow closure. Camping weather is perfect: t-shirts and shorts during the day, favorite hoodie at night.
Take a Colorado road trip while you’re at it. August begs for it with all roads open and adventures around every summit.
The honest caveat: Timed entry is required. Afternoon thunderstorms are almost daily above treeline. Be off exposed ridges by noon.
10. Hawaii Volcanoes National Park
Bumpass Hell | Lassen Volcanic National Park (Shutterstock/Pierre Leclerc)
Location: Hawaii
August Weather: Highs 80 to 85°F. Lows 65 to 70°F. Humidity 50 to 80%. Under 2 inches of rain (dry season).
Crowds: Medium. Late August drops as families head back to school.
Why August: Late August is the sweet spot as summer crowds thin. August falls in the dry season, giving more outdoor time without rain interruptions. The park offers trails across lava fields, through rainforests, and along coastal cliffs, catering to all abilities. The glow of Halema’uma’u Crater at night is mesmerizing.
The honest caveat: Volcanic activity is unpredictable. Check volcanic activity updates before your visit. Air quality near active vents can be poor.
11. Lassen Volcanic National Park
Location: California
August Weather: Highs 75 to 80°F. Lows 40 to 45°F. Under 1 inch of rain.
Crowds: Medium.
What’s Open: All roads plowed. Lassen Peak summit trail. Bumpass Hell. Night sky programs and astronomy festival. 200+ lakes.
What’s Closed: Nothing.
Park Guide: Things to Do | Facts
Why August: Lassen Peak (10,457 feet) is the largest dome volcano in the world. By August, plows have cleared all roadways, opening the summit trail. Yellowstone’s hydrothermal features without any of the crowds. Over 200 lakes, fumaroles, mud pots, and hot springs. The August astronomy festival and night sky programs are excellent.
The honest caveat: “Medium” crowds at Lassen means quiet compared to almost any other California park. But services are limited. Come prepared.
12. Great Basin National Park
The high-altitude beauty of The Loch on the Sky Pond hike in Rocky Mountain National Park. (Shutterstock/Infinite Wealth)
Location: Nevada
August Weather: Highs 85 to 90°F (lower). Lows 50 to 55°F.
Crowds: Low. Rarely tops 25,000 a month even in peak summer.
What’s Open: Lehman Caves. Wild caving permits for 7 caves. Wheeler Peak. Bristlecone pines. Dark Sky programs.
What’s Closed: Nothing.
Park Guide: Things to Do | Facts
Why August: Adventures range from half a mile below the surface to 13,000 feet. Wildflowers burst across the elevations. Bristlecone pines (some of the oldest living things on Earth) give a gothic vibe to the upper elevations. Perfect camping weather with some of the darkest and clearest skies in the nation. The park has an astronomy amphitheater.
The honest caveat: Lehman Cave tours can sell out quickly. Book ahead. The park is 70 miles from the nearest real town.
13. New River Gorge National Park
Places like Alalik Glacier can’t be seen without a boat or flightseeing tour at Kenai Fjords National Park. (Shutterstock/ Cavan-Images)
Location: West Virginia
August Weather: Highs 80 to 85°F. Lows 60 to 65°F. 3 to 4 inches of rain.
Crowds: Medium.
What’s Open: Upper and Lower Gorge whitewater rafting. 100+ miles of trails. Bridge Walk (800+ feet above the gorge). Waterfalls. Kaymoor Miners Trail (821 stairs).
What’s Closed: Nothing.
Park Guide: Things to Do | Guide
Why August: National Geographic ranked it one of the Top 20 Coolest Adventures in the World. The Upper and Lower Gorge offer two whitewater styles for every experience level. Book through one of the NPS-approved rafting companies. Eight of the 100+ waterfalls on the river are inside the park. Over 100 miles of trails.
The honest caveat: August is humid in West Virginia. Start hikes early. The park is becoming more popular every year. Don’t wait.
14. Mesa Verde National Park
The Big Room of Carlsbad Caverns National Park is big enough to fit six football fields inside. (Shutterstock/Doug Meek)
Location: Colorado
August Weather: Highs near 85°F. Lows around 51°F. About 2 inches of rain. 13 clear-sky days.
Crowds: Medium. Down from June/July peak.
What’s Open: Ranger-guided cliff dwelling tours (book 14 days ahead). 30 miles of trails. Night sky programs. Scenic drive.
What’s Closed: Spruce Tree House and Wetherill Mesa closed for safety projects. No self-guided cliff dwelling tours.
Park Guide: Things to Do | Facts
Why August: Crowds shrink from the June/July peak while ranger-guided tours are still in full swing. More than 4,700 archaeological sites await. Night sky programs run throughout August. Plan activities for early morning to avoid afternoon thunderstorms.
The honest caveat: Some cliff dwelling tours require climbing steep ladders or squeezing through narrow passageways. Check physical requirements before booking. Spruce Tree House and Wetherill Mesa remain closed for safety work.
15. Denali National Park
National Park of American Samoa, Tutuila Island, American Samoa, South Pacific. (Shutterstock-Danita Delimont)
Location: Alaska
August Weather: Highs around 60°F. Lows mid-40s. Fall foliage begins. 15+ hours of daylight.
Crowds: Medium to High.
What’s Open: Bus tours to Mile 43. The Big Five wildlife viewing (grizzlies, moose, caribou, Dall sheep, wolves). Berry season for bears. Northern Lights possible in late August.
What’s Closed: Park road stops at Mile 43 through fall 2026 due to the Pretty Rocks landslide. Everything beyond Mile 43 is inaccessible.
Park Guide: Alaska Guide
Why August: Fall foliage starts this early in Alaska. Berries are ripening and bears are bulking up for winter. I was thrilled with the caribou and moose dotting the landscape during the bus ride. The extra-long days still give way to dark enough skies for potential Northern Lights viewing in late August.
The honest caveat: The road closure at Mile 43 is a significant limitation through 2026. You won’t reach Wonder Lake or many iconic viewpoints. The park is still worth visiting, but set expectations accordingly.
Parks to Skip in August
Diablo Lake with a golden sunrise in North Cascade National Park (Shutterstock-Checubus)
Everglades. Peak hurricane season. Suffocating humidity. Daily thunderstorms. Mosquitoes at maximum aggression. December through March is the only sensible time.
Isle Royale. August is the buggiest month. Black flies make hiking miserable. The ferry books up anyway. Visit in June or early September instead.
Dry Tortugas. Peak hurricane season. Low visitation for good reason. The ferry books months ahead regardless. Spring is the window.
Map of Best National Parks in August
Where are you headed in August? Share your plans or your experience at any of these parks in the comments below. I read every one.
Related Monthly Guides
Previous Month: 15 Best National Parks to Visit in July
Next Month: 15 Best National Parks to Visit in September
All Months: National Parks by Season Hub
Best National Parks Ranked: All 63 National Parks Ranked by Experts
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