Monks MoundAbout Monks Mound
Monks Mound is the largest prehistoric earthen construction in North America north of Mesoamerica, located within the Cahokia Mounds State Historic Site in Illinois, United States. The structure is an immense stepped earthwork built by the Mississippian culture and dominates the Cahokia plaza complex.
The mound rises to about 30 metres (100 feet) and its base covers roughly 14 acres (about 5.7 hectares), making it the largest monument of its kind in the region. Visitors follow interpretive trails and use the visitor centre to understand the mound’s scale and the wider complex of platform mounds, plazas and residential areas.
Archaeological evidence shows Monks Mound was constructed in multiple stages during Cahokia’s peak occupation, roughly between AD 900 and AD 1200, serving as a central ceremonial and political platform. The site has been the focus of archaeological study and public interpretation since the 20th century.
Monks Mound sits within the Cahokia Mounds State Historic Site near Collinsville, Illinois, on the east bank of the Mississippi River opposite the St. Louis metropolitan area, a short drive from downtown St. Louis.
- Construction period: Constructed in multiple building stages by the Mississippian culture, the mound dates to the site’s peak between about AD 900 and AD 1200.
- Viewing points: The best panoramic views of the mound and surrounding plaza are available from the visitor centre and the mound’s public viewing terraces; check the site’s opening hours before visiting.
What to See#
- Monks Mound: An earthen platform mound built by the Mississippian culture, rising approximately 30 metres (100 feet) above the surrounding plain with a base footprint covering roughly 14 acres (about 5.7 hectares).
- Visitor centre and trails: The nearby visitor centre and interpretive trails at Cahokia Mounds State Historic Site provide exhibits, a short film and viewpoints of the mound and surrounding earthworks.
Best Time to Visit Monks Mound
Best in spring and autumn for comfortable weather and dramatic landscape views.
Weather & Climate near Monks Mound
Monks Mound's climate is classified as Hot-Summer Continental - Hot-Summer Continental climate with hot summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -7°C to 32°C. Moderate rainfall (969 mm/year).
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | -7° - 3° | -7° | 51 mm | - | - | 4.0 m/s | - | - |
| February | - | -4° - 7° | -3° | 56 mm | - | - | 3.9 m/s | - | - |
| March | - | 1° - 13° | 4° | 88 mm | - | - | 4.2 m/s | - | - |
| April | - | 7° - 19° | 13° | 94 mm | - | - | 4.2 m/s | - | - |
| May | - | 12° - 25° | 18° | 102 mm | - | - | 3.3 m/s | - | - |
| June | - | 18° - 29° | 23° | 94 mm | - | - | 2.9 m/s | - | - |
| July | - | 20° - 32° | 26° | 94 mm | - | - | 2.5 m/s | - | - |
| August | - | 19° - 31° | 25° | 82 mm | - | - | 2.4 m/s | - | - |
| September | - | 14° - 27° | 21° | 82 mm | - | - | 2.5 m/s | - | - |
| October | - | 8° - 21° | 14° | 69 mm | - | - | 3.1 m/s | - | - |
| November | - | 2° - 13° | 5° | 82 mm | - | - | 3.7 m/s | - | - |
| December | - | -4° - 6° | -3° | 75 mm | - | - | 3.8 m/s | - | - |
How to Get to Monks Mound
Cahokia Mounds is in Collinsville, Illinois, about 15-20 minutes east of downtown St. Louis by car. From I‑255 take exit 1B to Ramey Street; the site is clearly signed. Metro area public transit connections exist but are limited-driving is the most common option.
Tips for Visiting Monks Mound
- Climb Monks Mound early in the morning for the best views; the summit stands roughly 30 meters (100 feet) high and offers a rare vantage over the city's plan
- Visit the Interpretive Center to see reconstructions and artifacts that explain Mississippian life, including replica wooden structures and pottery
- Allow at least two hours to walk the trails and read the site plan-the scale of Cahokia is easy to underestimate