at Mastodon State Historic Site

Click here for information about how to reserve this shelter.

picnic shelter

Park Hours


38.379444, -90.395000

Park Hours

Historic Site Grounds

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

Museum hours

  • March 16 through Nov. 15
    9 a.m. - noon and 1 p.m. - 4 p.m., Wednesday through Saturday (closed noon - 1 p.m. for cleaning)
    Noon - 4 p.m., Sunday (closed Easter Day)
    Closed Monday and Tuesday
  • Nov. 16 through March 15
    11 a.m. - 4 p.m. Monday, Friday and Saturday
    Closed Tuesday through Thursday
    Noon - 4 p.m., Sunday
    Closed New Year's, Thanksgiving and Christmas days
Historic Site Office Hours
  • 9 a.m. to 4:30 p.m., Monday through Saturday
  • Noon 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.