Mount Lassen became a national monument in 1907 and Lassen National Park was created in 1916. Though there was initial opposition to a national park at Lassen, a violent eruption of Lassen Peak on June 14, 1914 made it the continental United States' first active volcano. On May 22, 1915 the mountain erupted again, sending a mushroom-shaped cloud four miles into the sky.
There was originally a large lodge named the Lassen Chalet that was demolished in 2005, as well as the Lassen Ski Area, which similarly closed up shop in 1992. Today a full-service visitor center stands in the place of the chalet, informing and directing new visitors to the park. Around Lassen Peak there are still active sites with boiling mud pots, stinking fumaroles, and hot springs.
Various hikes are scattered all over the mountain and surrounding areas. Of particular interest is the Lassen Peak Trail, which allows you to summit Mt. Lassen’s highest point. The round trip is approximately five miles and takes between 3-5 hours, depending on your pace. This trail starts at 8500 feet and reaches 10,457 feet at the summit! While it may sound daunting, this is a very attainable 10,000+ ft peak and a challenge you’ll be very glad you accepted. You can find other trails online which vary in elevation gain, difficulty, and necessary hiking time.
There is plenty to see and do at Lassen Volcanic National Park, so visit their website and plan your adventure soon!

 
Lassen National Park website: https://www.nps.gov/lavo/
Lassen National Park phone: 530.595.4480
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Some services and locations are closed during the off-seasons, so please check the Lassen Volcanic National Park website for more information and availability