| Year | Spring | Fall |
| 2024 | Driftless Area Wetlands Centre, Marquette | |
| 2023 | Sanford Museum, Cherokee | no meeting |
| 2022 | Jester Park Nature Center, Polk County | no meeting |
| 2021 | Virtual | no meeting |
| 2020 | Virtual (business meeting only) | Virtual |
| 2019 | Iowa State University, Ames (with Iowa Academy of Science) | Iowa City |
| 2018 | Buena Vista University, Storm Lake (with Iowa Academy of Science) | National Motorcycle Museum, Anamosa |
| 2017 | Council Bluffs | Silver Sioux Recreation Area, Cherokee |
| 2016 | Marquette/Effigy Mounds, Harpers Ferry | Iowa City (with MAC) |
| 2015 | Black Hawk College, Moline, IL (with IAAA) | Iowa City (with PAS) |
| 2014 | Luther College, Decorah | Dorothy Pecaut Nature Center, Sioux City |
| 2013 | Graceland University, Lamoni | Iowa City |
| 2012 | Hartman Reserve Nature Center, Cedar Falls | no meeting |
| 2011 | Wickiup Hill Outdoor Learning Center, Toddville | Cedar River Complex, Osage |
| 2010 | Sanford Museum, Cherokee/Prairie Heritage Center | no meeting |
| 2009 | Black Hawk State Historic Site, Rock Island, IL | Iowa City (with MAC) |
| 2008 | Des Moines Area Community College | no meeting |
| 2007 | Iowa City | Cherokee |
| 2006 | Boone | no meeting |
| 2005 | Putnam Museum, Davenport | Western Historic Trails Center, Council Bluffs |
| 2004 | Sanford Museum, Cherokee | Decorah |
| 2003 | Wickiup Hill Nature Center, Toddville | Sioux Falls (joint meeting with South Dakota) |
| 2002 | Ottumwa | no meeting |
| 2001 | Sanford Museum, Cherokee | Neil Smith Nature Area |
| 2000 | Calkins Nature Area, Iowa Falls | Luther College, Decorah |
| 1999 | Putnam Museum, Davenport | DeSoto Bend, Missouri Valley |
| 1998 | Otter Creek Nature Center, Tama | Iowa City |
| 1997 | Boone County 4-H Center | Lakeside Lab |
| 1996 | Buena Vista College, Sac City | Iowa City (with PAS) |
| 1995 | Ottumwa | Lime Creek Nature Center, Mason City |
| 1994 | Cherokee | Maquoketa |
| 1993 | Des Moines (Clive) | Glenwood |
| 1992 | Grout Museum, Waterloo | Lakeside Lab |
| 1991 | Ames | Iowa City |
| 1990 | Luther College, Decorah | no meeting |
| 1989 | Cedar Falls | Iowa City |
| 1988 | Davenport | no meeting |
| 1987 | Ames | Council Bluffs |
| 1986 | Iowa City | Sioux Falls |
