See this photo along with 11 others in the photo gallery.
On the way to Lassen Peak on a sunny august morning. Best route to get up is from South. From the car park you may need 2.5-3 hours to reach the peak, and 1 1/2 hours to get down again. Close to the peak you clearly feel the lack of oxygen !
J.Hajas has also submitted 10 other photos.