| 2026 | Mount Saint Mary's University | Richard Montgomery High School | Montgomery | MS | 8 (42) | Non Point Source Pollution |
| 2025 | Western MD 4H Edu. Center | North Harford High School | Harford | Alberta, Canada | 2(50) | Roots and Resiliency |
| 2024 | Mount Saint Mary's University | North Harford High School | Harford | NY | 3(49) | Renewable Energy for a Sustainable Future |
| 2023 | Western MD 4H Edu. Center | North Harford High School | Harford | New Brunswick, Canada | 10(49) | Adapting to a Changing Climate |
| 2022 | University of Maryland Clarksville Research Farm in Howard County | Richard Montgomery High School | Montgomery | OH | 2 | Waste to Resources |
| 2021 | virtual | Richard Montgomery High School | Montgomery | NE | 9 (42) | Water Resources Management: Local Control and Local Solutions |
| 2019 | St. Mary's College of Maryland | Calvert High School | Calvert | NC | 10 (53) | Agriculture and the Environment: Knowledge and technology to feed the world |
| 2018 | Western MD 4H Edu. Center | Venturing Crew 202 | Carroll | ID | 24 (51) | Western Rangelands Management |
| 2017 | Camp Pecometh | Venturing Crew 202 | Carroll | MD | 10 (54) | Ag Soil & Water Conservation Stewardship |
| 2016 | Mt. St. Mary's University | Venturing Crew 202 | Carroll | Ontario, Canada | 5 (52) | Invasive Species |
| 2015 | St. Mary's College of Maryland | Venturing Crew 202 | Carroll | MI | 7 (52) | Urban Forestry |
| 2014 | Camp Pecometh | Venturing Crew 202 | Carroll | N/A | N/A | Sustainable Local Ag/Locally Grown |
| 2013 | Western MD 4H Edu. Center | Harford Christian | Harford | MT | 17 (57) | Sustainable Rangeland Management |
| 2012 | St. James School | Harford Christian | Harford | PA | 7 (54) | Non-point Source Pollution/ Low Impact Development |
| 2011 | St. Mary's College of Maryland | Lenardtown HS | St. Mary's | New Brunswick, Canada | 24 (54) | Salt & Freshwater Estuaries |
| 2010 | Schmidt Center | Venturing Crew 202 | Carroll | CA | 5 (54) | Protection of Groundwater through Urban, Ag. & Env. Planning |
| 2009 | Mt. St. Mary's University | Venturing Crew 202 | Carroll | NC | 3 (52) | Biodiversity in a Changing World |
| 2008 | Harford Glen | Harford Christian | Harford | AZ | 20 (54) | Recreational Impacts on Natural Resources |
| 2007 | U.M. Eastern Shore | Walkersville HS | Frederick | NY | 16 (53) | Alternative/Renewable Energy |
| 2006 | Schmidt Center | Clear Springs HS | Washington | Manitoba, Canada | 15 (52) | Water Stewardship in a Changing Climate |
| 2005 | Harford Glen | Queen Anne's HS | Queen Anne's | MO | 22 (50) | Cultural Landscapes |
| 2004 | Mt. St. Mary's University | Montgomery Blair HS | Montgomery | WV | 11 (51) | Natural Resource Management in Urban Env. |
| 2003 | Schmidt Center | Montgomery Blair HS | Montgomery | MD | 5 (47) | Ag. Land Conservation & Preservation |
| 2002 | Harford Glen | Clear Springs HS | Washington | MA | 14 (49) | Introduced Species & their Effect on Biodiversity |
| 2001 | Schmidt Center | Joppatown HS | Harford | MI | 7 (49) | Urban Non-Point Source Pollution |
| 2000 | Garrett 4H Park | Joppatown HS | Harford | Nova Scotia, Canada | 12 (49) | Wetlands |
| 1999 | Schmidt Center | Fallston HS | Harford | CA | 4 (46) | Wildfire Management |
| 1998 | Smith Center | Fallston HS | Harford | MI | 2 (43) | Watersheds |
| 1997 | Hashawha | Joppatown HS | Harford | PA | 2 (37) | Pesticides |
| 1996 | Grove Point Girl Scouts Camp | Middletown HS | Catocin | NE | 2 (33) | Greenways |
| 1995 | Garrett 4H Park | Middletown HS | Catocin | ID | 6 (30) | Groundwater |
| 1994 | Schmidt Center | Joppatown HS | Harford | NC | 4 (23) | -- |
| 1993 | Schmidt Center | Cambridge S. Dorchester HS | Dorchester | NY | 1 (20) | -- |
| 1992 | Camp Tockwaugh | Kent HS | Kent | MD | 6 (14) | -- |
| 1991 | Garrett 4H Park | Cambridge S. Dorchester HS | Dorchester | MD | -- | -- |
| 1990 | -- | Beall HS | Alleghany | -- | 5 (5) | -- |