Dinosaur National Monument in September
September at Dinosaur National Monument averages a daytime high near 77°F and an overnight low around 50°F, with about 1.3" of precipitation. Visitation runs about 1.4× the park's average month, which makes September a busy month here.
- Average low
- 50°F
- Average high
- 77°F
Range across the year: 14°F to 91°F
- Precipitation
- 1.3 in
- Daylight
- 12.3 hours
Roughly 12% of the park's yearly visitors come in September: about 37,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 4th-busiest of the park's twelve months, sitting between the July peak (2.5×) and the February low (0.2×).
On our Best Time to Visit score September rates 65/100 ("Good"). Our recommended month is May: the lightest crowds of the park's good-weather months.
The daily average of about 64°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 18.2 miles from the park.
Because June, July and August together draw about 56% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.
You'll have about 12.3 hours of daylight in September to explore — between the 9.1-hour midwinter low and the 14.9-hour summer high.
Park-wide, 2025 drew 315,725 recreation visits, down 2% from 322,113 in 2024.
Across the past decade overall visitation has risen about 12.6%, so a September visit is likely to feel busier than it did a few years ago.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 88°F / 59°F | 2.1× Very busy | 49 Fair |
| September | 77°F / 50°F | 1.4× Busy | 65 Good |
| October | 61°F / 39°F | 0.9× Average | 57 Fair |
All twelve months at Dinosaur, with the best time to visit.
Things to do at Dinosaur in September
The National Park Service tags 28 Dinosaur activities for fall. Here are 8 of them. Each links to the park's own page for it.
- Bicycling at Dinosaur
- Drive the Echo Park Road · 1-4 hours
- Drive the Island Park Road · 2-4 hours
- Drive the Yampa Bench Road · 2-6 hours
- Hike the Bull Canyon Trail · 1-5 hours
- Hike the Confluence Trail · 30-120 minutes
- Hike the Plug Hat Trail · 15-45 minutes
- Hike the Ruple Point Trail · 4-12 hours
Frequently Asked Questions
September averages a daytime high near 77°F and an overnight low around 50°F at Dinosaur National Monument, with about 1.3 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 18.2 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Dinosaur National Monument (about 1.4× the average month). Our best-time score rates it "Good" at 65/100. Our recommended month is May.
The busiest month is July and the quietest is February. September sits at about 1.4× the park's average, or 12% of annual visitation.
A typical September sees about 37,000 recreation visits at Dinosaur National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Dinosaur in September
Booking a September trip to Dinosaur National Monument? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Dinosaur
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Visiting Dinosaur in September?
Get crowd forecasts and lodging deals for Dinosaur by email. No spam, unsubscribe anytime.
See the full ranking of the best national parks to visit in September.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.