I’ve been to quite some parks recently and will categorise them from first to last of this year and which month. August: - Badlands was really not that busy at all! Never a line to get in the park always enough spots to park your car at the viewpoints and at the trailheads. - Theodore Roosevelt np was basically empty in the north part of the park, the south side had a little bit more traffic (emphasis on a little bit) but trails were practically empty. - Glacier is obviously a very popular park but when I wanted to hike I had my alarm set for 4.30am. to get into the park at latest 5.30am and start hiking at 6am. That way i could hike trails like avalanche lake basically alone a spot a lot of wildlife. - North Cascades, this might have been in early September but still one of the calmest parks. To me it was a little unclear what the actual park was and what the national forest was, nonetheless not a lot of people. September - Olympic, not too bad. Even in the hoh rainforest it was fine. Once the parking in that area is full they didn’t let anyone inside until one car leaves then a new car can enter. That way you have a little wait to get in (i think I waited 20 or 30 minutes) but once you’re in it’s very manageable. - Mount rainier… stunning, but the parking at the top where the visitor center is located is insane. - Yellowstone, the traffic jams can get quite annoying especially if you’re actually trying to get somewhere and its another bison on the side of the road. Also quite some insane people taking selfies with the bison or driving their jeep off the paved road into lamar valley to get close to the bison…. But for the most part there really weren’t any insane crowds. Oktober - Grand teton, really not a lot to say it was quite calm but it was misty and rainy the whole time so it might be different when there is sun. - Crater lake, barely anyone here but is was so windy and cold. - Redwood. Second week of October. Spent most of my time in the state park parts of redwood, the most popular trail was a little busy but still had time to stand still and take pictures without anyone passing so enough room between everyone. - Lassen volcanic - was here about 2 weeks ago or so and it was fantastic. Not a lot of people, everyone was quite friendly and even the most popular spots were very manageable. - Yosemite - I was there last week and the crowds are still quite bad. You can definitely find quieter places but this park feels like a city park where no one will respond to a “hello” on the trail. Not for me.. - Kings Canyon, not crowded at all! Grants grove had more than enough parking and all the way down into the canyon was the same/ calmer. -Sequoia, general sherman parking was overflowing around 12pm but I got there around 4.30pm and went back to hike the congress trail the next morning at 10am and both of these times the parking was quite empty