Gateway Arch
A 630-foot stainless steel arch and the smallest national park in the country.
1 national park in Missouri
Missouri's National Park
Missouri is home to Gateway Arch National Park. A 630-foot stainless steel arch and the smallest national park in the country.
The best time to visit Gateway Arch National Park is March–May and September–November. For great conditions with fewer people, aim for October and November. It's busiest in July through September.
About the park
Nearby parks in other states
Mammoth Cave
Kentucky · Best Mar–May, Oct–Nov
Indiana Dunes
Indiana · Best Jul–Sep
Hot Springs
Arkansas · Best Mar–May, Oct–Nov
Great Smoky Mountains
Tennessee & North Carolina · Best Apr–Jun, Sep–Oct
Questions
How many national parks are in Missouri?
Missouri has 1 national park: Gateway Arch National Park.
When is the best time to visit national parks in Missouri?
The best time to visit Gateway Arch National Park is March–May and September–November. For great conditions with fewer people, aim for October and November. It's busiest in July through September.
Last reviewed October 4, 2026. Ratings are editorial. Rules and road openings change each year, so confirm on the official NPS site before you go.