The date of the eruptions that formed the 340-meter-high cone (1,120 ft) was initially derived from tree-ring dates, suggesting the eruption began between the growing seasons of A.D. 1064–1065. However, more recent geologic and archaeological evidence places the eruption around A.D. 1085. The largest vent of the eruption, Sunset Crater itself, was the source of the Bonito and Kana-a lava flows that extended about 1.6 miles NW and 6 miles NE, respectively. Additional vents along a 6.2 miles long fissure extending SE produced small spatter ramparts and a 4 miles-long lava flow to the east. The Sunset Crater eruption produced a blanket of ash and lapilli covering an area of more than 810 square miles and forced the temporary abandonment of settlements of the local Sinagua people. The volcano has partially revegetated, with pines and wildflowers. The crater is the namesake for the Sunset Crater Beardtongue.
The hiking trail below the summit skirts the substantial Bonito Lava Flow. This hardened lava is black and appears fresh as it has devastated the forest in its path. The lava flow also created an ice cave or tube that is now closed to the public after a partial collapse.
Sunset Crater Volcano National Monument is a U.S. National Monument in the north-central part of the U.S. state of Arizona, created to protect Sunset Crater, a cinder cone within the San Francisco Volcanic Field. The monument is managed by the National Park Service in close conjunction with nearby Wupatki National Monument. In 1928, a Hollywood film company - Famous Players-Lasky Corporation - planned to detonate large quantities of explosives on the side of Sunset Crater in order to create an avalanche for Zane Grey's motion picture, "Avalanche". Public outcry over this plan led in part to the proclamation of Sunset Crater Volcano National Monument by President Herbert Hoover in 1930.
A one-mile self-guided loop trail is located at the base of Sunset Crater but hiking to the summit is not permitted. A trail providing access to the summit and crater was closed in 1973 because of excessive erosion caused by hikers.
The visitor center is located near the park entrance, 15 miles north of Flagstaff, Arizona, along U.S. Highway 89.
Hours: Currently closed due to Government Shutdown – Hopefully will reopen soon
Website: www.nps.gov/sucr/
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