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The Great MonARCH Migration Event

  • Gateway Arch Park - Luther Ely Smith Square 20 North 4th Street St. Louis, MO, 63102 United States (map)

Join the City & National Park Service at The Great MonArch Migration Event 2018. Come enjoy monarch-themed activities, get free plants, seeds and information, and meet pollinator experts at the Arch. The 2018 Event Flyer has additional details about activities, including free yoga and the Great Mississippi Riverfront CleanUp event.


The event is happening Saturday, September 30th at Luther Ely Smith Square (between Fourth Street & the Gateway Arch).

There’s free breakfast, prizes and because this event coincides with National Public Lands Day, you'll get $3 off tram rides to the top of the Arch

It runs from 9 till noon. For more information, visit


Greenscape will be providing free butterfly plants for attendees!