How Crowded Is Lake Roosevelt in September?
Average1.1× average month · best-time score 62/100
September is an average month at Lake Roosevelt National Recreation Area, running about 1.1× the park's average month — roughly 9% of the year's visitors come in September. That puts it between the July peak and the December low. Overall our best-time score rates September as "Good" for a visit. You'll get about 12.3 hours of daylight to explore.
Frequently Asked Questions
September is average at Lake Roosevelt National Recreation Area (about 1.1× the average month). Our best-time score rates it "Good". The single best month overall is May.
The busiest month is July and the quietest is December. September sits at about 1.1× the park's average, or 9% of annual visitation.
Source: National Park Service Visitor Use Statistics (1979–2025). Updated 2026-06-20.