Busiest National Parks in September

These parks run well above their typical crowd levels in September, measured as a crowd index (1.0 = the park's average month) from National Park Service visitation records. A high index means September is one of that park's peak months — expect full lots and busy trails.

1. 1
   Gauley RiverWest Virginia
   Very busy3.63×
2. 2
   Governors IslandNew York
   Very busy2.37×
3. 3
   YellowstoneIdaho, Montana, Wyoming
   Very busy2.08×
4. 4
   Great BasinNevada
   Very busy2.07×
5. 5
   AcadiaMaine
   Very busy2.04×
6. 6
   GlacierMontana
   Very busy1.98×
7. 7
   Flight 93Pennsylvania
   Very busy1.97×
8. 8
   Glacier BayAlaska
   Very busy1.93×
9. 9
   Craters Of The MoonIdaho
   Very busy1.93×
10. 10
    Ocmulgee MoundsGeorgia
    Very busy1.90×
11. 11
    Grand TetonWyoming
    Very busy1.88×
12. 12
    Cedar BreaksUtah
    Very busy1.86×
13. 13
    Theodore RooseveltNorth Dakota
    Very busy1.85×
14. 14
    MissouriSouth Dakota, Nebraska
    Very busy1.84×
15. 15
    Minuteman MissileSouth Dakota
    Very busy1.83×
16. 16
    Lassen VolcanicCalifornia
    Very busy1.82×
17. 17
    Rocky MountainColorado
    Very busy1.80×
18. 18
    Bryce CanyonUtah
    Very busy1.80×
19. 19
    Pictured RocksMichigan
    Very busy1.79×
20. 20
    Klondike Gold RushAlaska
    Very busy1.76×
21. 21
    Upper DelawareNew York, Pennsylvania
    Very busy1.76×
22. 22
    Florissant Fossil BedsColorado
    Very busy1.76×
23. 23
    Black Canyon Of The GunnisonColorado
    Very busy1.75×
24. 24
    Marsh - Billings - RockefellerVermont
    Very busy1.75×
25. 25
    EisenhowerPennsylvania
    Very busy1.72×
26. 26
    Valles CalderaNew Mexico
    Very busy1.70×
27. 27
    Mount RainierWashington
    Very busy1.69×
28. 28
    CurecantiColorado
    Very busy1.69×
29. 29
    Salem MaritimeMassachusetts
    Very busy1.67×
30. 30
    Paterson Great FallsNew Jersey
    Very busy1.67×
31. 31
    Mount RushmoreSouth Dakota
    Very busy1.66×
32. 32
    Crater LakeOregon
    Very busy1.66×
33. 33
    Apostle IslandsWisconsin
    Very busy1.66×
34. 34
    Jewel CaveSouth Dakota
    Very busy1.65×
35. 35
    Capitol ReefUtah
    Very busy1.64×
36. 36
    Wolf Trap National Park for the Performing ArtsVirginia
    Very busy1.64×
37. 37
    City Of RocksIdaho
    Very busy1.64×
38. 38
    Natural BridgesUtah
    Very busy1.62×
39. 39
    Perry's Victory & International PeaceOhio
    Busy1.59×
40. 40
    Grand PortageMinnesota
    Busy1.59×