• View of Half Dome and Washington Column in Yosemite Valley

    Yosemite

    National Park California

There are park alerts in effect.
show Alerts »
  • Tioga Road is Closed for the Winter

    The Tioga Road (Highway 120 through the park) is closed due to snow; it usually reopens in late May or June. You can check on current road conditions by calling 209/372-0200 (press 1 then 1). More »

Yosemite Ranger Notes

About This Blog

Ranger-naturalists have been interpreting the natural and cultural resources of Yosemite for park visitors for nearly a century. In this blog, some of Yosemite's park rangers share recent observations from around Yosemite.

All posts are shown below, or you can view posts by topic.

Lyell Glacier

September 11, 2013 Posted by: BR - Park Ranger/Resources Management & Science Liaison

August 29 marked the 142nd Anniversary of the first recorded ascent of Mount Lyell, Yosemite’s highest peak (13,114 feet). J. B. Tileston made that ascent in 1871. He left his base camp at four in the afternoon the day before he summited. Darkness found him bivouacked high in the mountains where he....

 

Bird Banding Bonanza!

July 26, 2013 Posted by: JR - MAPS Avian Technician

It's been a hot, busy summer so far during this year's field season of bird banding in Yosemite. Banding occurs at six stations clustered on the west slope of Yosemite, which are each operated once every ten days as part of the Monitoring Avian Productivity and Survivorship (MAPS) program. Data are collected at over 300 MAPS stations across the U.S. and Canada every summer between May and August, and scientists and land managers use these data to look at demographic trends in songbird populations both locally and continent-wide.

 

California Black Oak Grove Study Begins in the Valley

April 05, 2013 Posted by: BW - Volunteer Interpreter

It is hard to overstate the importance of the California black oak (Quercus kelloggii) to Yosemite National Park. With so many other icons, it may be easy to overlook the black oak, but it is one of the most important cultural, biological, and scenic resources in the park.

 

What Causes Rockfall on Calm Days in Summer?

December 19, 2012 Posted by: BR - Park Ranger/Resources Management & Science Liaison

What causes rockfall on calm days in summer? When it rains and rocks fall we pretty much know that running water probably triggered it. Likewise we understand that earthquakes and the freezing and thawing of ice on cliffs can also trigger rockfall. However, there are other triggers that remain a mystery. Why is it that rocks also fall on perfectly calm summer afternoons with no apparent cause?

 

2012 Christmas Bird Count

December 18, 2012 Posted by: BW - Volunteer Interpreter

2012 Christmas Bird Count Last Sunday over 40 enthusiastic birders braved the cold temperatures to participate in the 113th annual Christmas Bird Count. This nationwide event is sponsored by the National Audubon Society and features local groups identifying and counting every bird they see in a given area for one day.

 

Did You Know?

Half Dome Permit

Hiking to Half Dome? Permits are now required seven days per week when the cables are up (typically late May through mid October, conditions permitting). More...