YELLOWSTONE NATIONAL PARK
MORNING BRIEFING
TUESDAY, SEPTEMBER 15, 2026
Sunrise: 6:53 AM | Sunset: 7:30 PM
ParkData
Generated 4:04 PM
Weather Forecast
Mammoth Hot Springs ~6,200 ft
🌤️
Today
59°F
Mostly Sunny
Precip: 1%
⛅
Tonight
35°F
Partly Cloudy
Precip: 4%
🌤️
Wednesday
57°F
Mostly Sunny
Precip: 3%
🌤️
Wednesday Night
37°F
Mostly Clear
Precip: 1%
Yellowstone Lake ~7,700 ft
🌤️
Today
52°F
Mostly Sunny
Precip: 0%
🌤️
Tonight
38°F
Mostly Clear
Precip: 10%
⛈️
Wednesday
54°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
Precip: 24%
⛈️
Wednesday Night
38°F
Chance Showers And Thunderstorms
Precip: 53%
Yesterday's Visitation
| Entrance | Yesterday (Mon, Sep 14) | Same Date (Sun, Sep 14, 2025) | Change | Same Day (Mon, Sep 15, 2025) | Change |
|---|---|---|---|---|---|
| North (Gardiner) | 3,374 | 2,909 | +16% | 3,058 | +10% |
| South (Grand Teton) | 1,935 | 1,842 | +5% | 1,765 | +10% |
| East (Cody) | 1,197 | 1,166 | +3% | 1,162 | +3% |
| West (West Yellowstone) | 4,958 | 4,832 | +3% | 4,595 | +8% |
| Northeast (Cooke City) | 1,041 | 1,065 | -2% | 937 | +11% |
| Total | 12,505 | 11,814 | +6% | 11,517 | +9% |
Yesterday (Mon, Sep 14): 12,505 visitors
| vs same date last year: 11,814 (+6%)
| vs same day last year: 11,517 (+9%)
Wildlife Activity (Last 24 Hours)
No wildlife sightings reported in the last 24 hours.
Community Sightings (via iNaturalist)
River Conditions
Yellowstone River at Corwin Springs
| Discharge | 1,420 CFS | Sep 15, 3:00 PM |
| Gauge Height | 1.53 ft | Sep 15, 3:00 PM |
| Water Temperature | 54 °F | Sep 15, 3:15 PM |
Active Alerts & Closures
Park Closure (1)
Biscuit Basin Closed Due to Hydrothermal Explosion
The parking lot, boardwalk, and Firehole River at Biscuit Basin, located north of Old Faithful, is closed to all travel until further notice due to the possibility of another event at the site of a hy…
Caution (1)
Stay Away From Bull Elk
Bull elk are fast and unpredictable this time of year and can seriously injure people. If an elk charges, run. In addition to staying at least 25 yards (23 m) away from elk and bison, always stay at l…
Information (3)
West Thumb Geyser Basin Boardwalk - Partial Closure
A section of the West Thumb Geyser Basin boardwalk will be closed to Fishing Cone and Lakeshore Geyser through mid-October while crews replace damaged support structures along the shoreline. The remai…
Traffic Delays - Gardner River High Bridge
Expect a single lane of traffic with up to 15-minute delays, 24 hours a day, seven days a week, from April 1 through late October 2026. Oversized/overweight vehicles (8'6"+ wide, 75'+ long, 80,000 lbs…
Vehicle Entrance Reservation Not Needed
Although an entrance pass is required to enter Yellowstone National Park, vehicle reservations are not needed. You are encouraged to purchase an entrance pass before arriving, but you may also purchas…
Campground Status (Recreation.gov)
| Campground | Area | Status | Reserved | Available | Closed | Occupancy |
|---|---|---|---|---|---|---|
| Mammoth | North | Full | 81 | 0 | 0 | Full |
| Indian Creek | North | Closed | 0 | 0 | 68 | -- |
| Pebble Creek | Northeast | Closed | 0 | 0 | 27 | -- |
| Tower Fall | Northeast | Full | 28 | 0 | 3 | Full |
| Lewis Lake | South | Full | 80 | 0 | 1 | Full |
| Slough Creek | Northeast | Full | 14 | 0 | 2 | Full |
|
Norris
Closed since 2024. Check NPS for reopening date.
|
Central | Seasonal Closed | -- | -- | -- | -- |
7-Day Occupancy Trend
Mammoth:
Today 100%
| Wed 100%
| Thu 100%
| Fri 100%
| Sat 100%
| Sun 100%
| Mon 100%
| Tue 100%
Tower Fall:
Today 100%
| Wed 100%
| Thu 97%
| Fri 100%
| Sat 100%
| Sun 100%
| Mon 100%
| Tue 100%
Lewis Lake:
Today 100%
| Wed 100%
| Thu 100%
| Fri 100%
| Sat 100%
| Sun 98%
| Mon 98%
| Tue 100%
Slough Creek:
Today 100%
| Wed 100%
| Thu 100%
| Fri 100%
| Sat 100%
| Sun 100%
| Mon 100%
| Tue 100%
Concessioner Campgrounds (Yellowstone National Park Lodges)
| Campground | Area | Sites | Status | Notes |
|---|---|---|---|---|
| Bridge Bay | Lake | 432 | Seasonal Closed | Opens late May |
| Canyon | Canyon | 273 | Seasonal Closed | Opens late May |
| Grant Village | South | 430 | Seasonal Closed | Opens late June |
| Madison | West | 278 | Seasonal Closed | Opens late April |
| Fishing Bridge RV | Lake | 346 | Seasonal Closed | Opens mid May, full hookups |
Park Information
No active park information notices.
Data Source Status
Weather (weather.gov)
NPS Alerts
NPS Campgrounds
ParkData Sensors
Historical Comparison
USGS Water
iNaturalist
Recreation.gov Availability
Briefing generated at 9/15/2026, 4:04:46 PM (fetch: 1468ms)