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at Mastodon State Historic Site

children playing on playground equipment children swinging on swing set


Park Hours


38.379370, -90.394553

Park Hours

For temporary closures related to weather, stewardship activities and maintenance, as well as temporary trail closures, click here to visit our Park and Site Status Map.

On the following days (actual or observed), staff will not be available and site buildings will be closed: Christmas Eve; Christmas Day; New Year’s Eve; New Year’s Day; Jan. 2, 2023; Martin Luther King Jr. Day; Lincoln’s Birthday; and Presidents Day. 

Historic Site Grounds

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

Museum hours

  • March 16 through Nov. 15
    Museum closed Monday and Tuesday
    9 a.m. to 4:30 p.m. Wednesday through Saturday
    Noon to 4:30 p.m. Sunday (closed Easter Sunday)
  • Nov. 16 through March 15
    Museum closed Monday through Wednesday
    11 a.m. to 4 p.m. Thursday through Saturday*
    Noon to 4 p.m. Sunday
    *Closed Thanksgiving, Christmas and New Year's days
Historic Site Office Hours
  • 9 a.m. to 4:30 p.m., Monday through Saturday
  • Noon to 4:30 p.m., Sunday (closed Easter 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.