Mastodon State Historic Site

Park Information

Looking to take a trip to where something big happened? Try a visit to Mastodon State Historic Site. The historic site is home to the Kimmswick Bone Bed, one of the most extensive ice age fossil deposits in the country. Excavations at the site have yielded a number of bones, including remains of mastodons and giant ground sloths. Stone spear points from the Clovis culture (14,000-10,000 years ago) provided the first solid evidence of the coexistence of people and prehistoric beasts. The museum interprets the cultural and natural landscape of Missouri during the Pleistocene epoch. In addition to the museum, the historic site provides recreational opportunities such as three hiking trails and a picnic area.

Park Hours

Historic Site Grounds

  • 8 a.m. to one-half hour after sunset, daily, year-round

Historic Site Office

  • 9 a.m. to 4:30 p.m., Monday through Saturday
  • 12 p.m. to 4:30 p.m., Sunday
  • Please note there will be times when the office is temporarily closed while staff are working on the grounds. The office telephone is monitored for messages during office hours.

Museum hours

  • March 16 through Nov. 14
    9 a.m. - 4:30 p.m. Monday-Saturday
    12 p.m. - 4:30 p.m. Sunday (closed Easter Day)
  • Nov. 15 through March 15
    11 a.m. - 4 p.m. Monday
    Closed Tuesday-Thursday
    11 a.m. - 4 p.m. Friday and Saturday
    12 p.m. - 4 p.m. Sunday
    Closed New Year's, Thanksgiving and Christmas days