Updated October 2026
Best Time to Visit Hagerman Fossil Beds National Monument
National MonumentIdaho
Best month to visit
September
81°F / 44°F avg high / low
Our recommendation
Visit Hagerman Fossil Beds in September
September offers the lightest crowds of the park's good-weather months. For comparison, July is the most crowded month (~2.3× the average month) and January is the quietest.
- Annual visits
- 37K
- 2025
- Busiest month
- Jul
- 2.3× avg
- Quietest month
- Jan
- 0.1× avg
- 10-yr trend
- rising
- +17.4%
More photos of Hagerman Fossil Beds
Photos courtesy of the National Park Service (public domain).
How crowded is Hagerman Fossil Beds by month?
Relative crowd level by month (1.0 = the park's average month), from NPS visitation records 1995–2025.
Month-by-month crowd, weather & daylight
Hagerman Fossil Beds National Monument weather by month →
| Month | Crowd level | Best-time score | Avg high / low | Daylight |
|---|---|---|---|---|
| January | Very quiet | 3 Poor | 38°F / 22°F | 9.2 h |
| February | Very quiet | 51 Fair | 45°F / 25°F | 10.3 h |
| March | Quiet | 55 Fair | 55°F / 31°F | 11.7 h |
| April | Quiet | 61 Good | 62°F / 35°F | 13.2 h |
| May | Busy | 64 Good | 72°F / 44°F | 14.4 h |
| June | Very busy | 58 Fair | 82°F / 50°F | 15.1 h |
| July | Very busy | 35 Poor | 92°F / 56°F | 14.9 h |
| August | Very busy | 48 Fair | 91°F / 53°F | 13.8 h |
| Septemberour pick | Busy | 67 Good | 81°F / 44°F | 12.3 h |
| October | Quiet | 60 Good | 66°F / 35°F | 10.8 h |
| November | Very quiet | 53 Fair | 50°F / 27°F | 9.5 h |
| December | Very quiet | 2 Poor | 38°F / 22°F | 8.9 h |
Climate normals (1991–2020) from the nearest NOAA station (USC00103932, ~1.8 mi away).
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About visiting Hagerman Fossil Beds
Hagerman Fossil Beds National Monument is a National Monument in ID and one of the system's hidden, low-traffic units, drawing about 37,000 recreation visits in 2025. Visitation has climbed over the past decade, up roughly 17.4%, so crowds are trending heavier each year. Crowds concentrate sharply by season: July is the busiest month at about 2.3× the park's average month, while January is the calmest at roughly 0.1× — a 16-to-1 swing between high and low season. Roughly 53% of the year's visitors arrive in the three summer months of June, July and August alone, so timing a trip outside that window is the single biggest lever on how crowded the park feels. Weather swings from an average high-season warmth near 74°F in July down to about 30°F in December, with the wettest stretch in December. About 6 months a year see comfortable average temperatures in the 50–80°F range, which is part of why crowd timing and weather timing don't always line up. The sweet spot is September: the lightest crowds of the park's good-weather months. Visit then and you trade a little peak-season certainty for noticeably shorter lines and easier parking than the July rush. Daylight ranges from about 8.9 hours in midwinter to 15.1 hours near the summer solstice, which shapes how much ground you can cover in a day. These crowd figures are drawn from 1995–2025 of National Park Service visitor-use records, paired with 1991–2020 NOAA climate normals, and are updated as new monthly data is released.
Park overview
During the Pliocene, this place looked quite different. Lush wetlands, forests, and grasslands provided excellent habitat for a variety of animals. From fascinating, now-extinct creatures like the saber-toothed cat, mastodon, and ground sloth, to more familiar animals like horses, beavers, and birds, the scientific study of Pliocene fossils is the key to Hagerman.
Weather & conditions
Hagerman, Idaho, gets 10 inches of rain per year. On average, there are 213 sunny days per year in Hagerman, Idaho. The July high is around 94 degrees. The January low is 22. Our comfort index, which is based on humidity during the hot months, is a 78 out of 100, where higher is more comfortable. The US average on the comfort index is 44.
Park overview text courtesy of the National Park Service — official park site.
Where to stay near Hagerman Fossil Beds
Hotels, cabins, lodges and vacation rentals near Hagerman Fossil Beds National Monument — live availability and prices to plan your trip. September is our pick for the best balance of light crowds and good weather. Full lodging guide: when to book, gateway vs in-park, and the crowd calendar that drives room rates.
Top-rated places to stay near Hagerman Fossil Beds
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.
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Getting to Hagerman Fossil Beds
The nearest airport is Boise Air Terminal (Gowen Field) (BOI), about 100 mi (1 hr 51 min drive) away. Most visitors reach Hagerman Fossil Beds by car.
What takes a reservation at Hagerman Fossil Beds
From National Park Service records read on October 11, 2026. Timed-entry and permit rules change from season to season; the official Hagerman Fossil Beds page has this year's.
Activities the park marks as needing a reservation
Frequently Asked Questions
September offers the lightest crowds of the park's good-weather months at Hagerman Fossil Beds National Monument. The park is busiest in July (about 2.3× the average month) and quietest in January.
July is the busiest month at Hagerman Fossil Beds National Monument, running roughly 2.3 times the park's average monthly visitation.
January is the quietest month at Hagerman Fossil Beds National Monument, at about 0.1× the average month — a good choice if you want to avoid crowds.
Hagerman Fossil Beds National Monument recorded about 36,667 recreation visits in 2025. Visitation has been rising over the past decade (+17.4%).
Based on 1991–2020 climate normals, the warmest month at Hagerman Fossil Beds National Monument averages about 74°F (July). See the month-by-month table above for the full picture.
Boise Air Terminal (Gowen Field) (BOI) is the closest airport to Hagerman Fossil Beds National Monument, about 100 mi (1 hr 51 min drive) away.
Nearby parks to visit
Keep exploring
Water quality of lakes near Hagerman Fossil Beds
If you are planning to swim, paddle or fish on this trip, these graded lakes are within a 40-mile drive. Grades are A–F from EPA and state-agency sampling.
- Bliss Reservoir water qualityGrade — · 9 mi · ID
- Pioneer Reservoir water qualityGrade — · 15 mi · ID
- Bray Lake water qualityGrade — · 18 mi · ID
- Dog Creek Reservoir water qualityGrade — · 19 mi · ID
- Morrow Reservoir water qualityGrade — · 25 mi · ID
Sources: National Park Service Visitor Use Statistics (1995–2025), NOAA NCEI U.S. Climate Normals 1991–2020. Crowd index = a month's visits ÷ the park's average month.