1944-1946. Vagabond Theater, Baltimore, Md.; Maryland Institute, Baltimore; Whyte Gallery, Washington, D.C.; Notre Dame College, Baltimore, Md.
1947. George Binet Gallery, New York; Bangor Public Library, Bangor, Me.
1948. Howard University, Washington, D.C.; Kutztown Teacher’s College, Kutztown, Pa.; University of Idaho, Moscow, Id.; Green Mountain College, Poultney, Vt.
1949. Benedict College, Columbia, S.C.; Chico State Teacher’s College, Chico, Ca.; Claflin College, Orangeburg, S.C.; Kansas City Art Association, Kansas City, Ka.; Oklahoma A & M, Stillwater, Ok.; Stewart Art Gallery, Norfolk, Ct.
1950. University of Scranton, Scranton, Pa.; San Francisco State College, San Francisco, Ca.; College of the Pacific, Stockton, Ca.; Pennsylvania State Teachers College, College Station, Pa.; Trefethen Evergreen Art Association, Peaks Island, Me.; Bryn Mawr Art Center, Bryn Mawr, Pa.
1951. Summit Art Association, Summit, N.J.; Morristown Art Club, Morristown, N.J.; Genese College, Genese, N.Y.; Brooks Memorial Art Museum, Memphis, Tn.; Rochester Art Institute, Rochester, N.Y.; Everhart Museum, Scranton, Pa.; Summer Arts Festival, University of Maine, Orono, Me.; Rowantrees Arts Pavilion, Blue Hill, Me.
1952. Jordan Pond House, Acadia National Park, Bar Harbor, Me.; Camden Hills Theater, Camden, Me.; State College, Cortland, N.Y.; Summer Arts Festival, University of Maine, Orono, Me.
1953. Bermuda Art Association, Hamilton, Bermuda; Theta Chi Fraternity, University of Maine, Orono, Me.
1954. University of New Hampshire, Durham, N.H.; Summer Arts Festival, University of Maine, Orono, Me.; Camden Hills Theatre, Camden, Me.
1955-1975. Studio-Terrace Exhibitions, Vincent A. Hartgen home, 109 Forest Av., Orono, Me.
1955. Bates College, Lewiston, Me.; Colby College, Waterville, Me.
1956. Kennedy Galleries, New York; Jesup Memorial Library, Bar Harbor, Me.; Farleigh-Dickinson College, Rutherford, N.J.
1957. Artists Gallery, New York; Allen Art Gallery, Baker University, Baldwin, Ka.; Fogler Library, University of Maine, Orono, Me.
1958. Memorial Union, University of Maine, Orono, Me.; Doll and Richards Gallery, Boston, Ma.
1959. Florida Gulf Coast Art Center, Clearwater, Fl.; Westside Gallery, New York, N.Y.; Collector’s Corner Gallery, Washington, D.C.; Northeast Harbor Community Center, Northeast Harbor, Me.
1960. Greenwich Library Art Association, Greenwich, Ct.; Hallmark Cards, Inc., Kansas City, Mo.; The Little Gallery, Manhasset, N.Y.; Schoener’s Gallery, Allentown, Pa.; Seacoast Gallery, Trenton, Me.; Wiley Gallery, Hartford, Ct.; Hebron Academy, Hebron, Me.
1961. Town and Country Club, Hartford, Ct.; Broadlawn Inn Gallery, Camden, Me.; Northeast Harbor Community Center, Northeast Harbor, Me.; Mt. Desert Chamber of Commerce, Bar Harbor, Me., “Woodscapes of Maine,” 30 watercolors.
1962. University of Maine at Machias, Machias, Me.; Chase Gallery, New York, N.Y. “Vincent Hartgen Paintings,” 30 watercolors.
1963. Ferdinand Roten Galleries, Baltimore, Md.
1964. Moore Studio Gallery, Savannah, Ga.; “Vincent A. Hartgen, Paintings,” Treat Gallery, Bates College, Lewiston, Me.,20 watercolors.
1965. Baker-Wright Gallery, Bath, Me., Argus Gallery, Madison, N.J. “Vincent Hartgen Paintings; ” The Chase Gallery, New York, “Vincent Hartgen Paintings,” 30 watercolors.
1966. Chase Gallery, New York; University of New York, Alfred, N.Y.
1967. “Vincent Hartgen Paintings,” Bowdoin College, Brunswick, Me., 30 watercolors; Gorham State College, Gorham, Me. “Vincent Hartgen Paintings,” 35 watercolors.
1968. Westbrook College, Westbrook, Me.; Cinema One, Brewer, Me.
1969. Downeast Gallery, Washington, D.C.
1971, October. King’s College, Wilkes-Barre, Pa. “Aquarelle Watercolors: Vincent Hartgen.” 20 paintings.
1972. Hebron Academy, Hebron, Me., “Vincent A. Hartgen Paintings: Maine Seascapes & Woodscapes; ” Kalamazoo Art Center, Kalamazoo, Mi., “Watercolors by Vincent Hartgen.”
1973. Franklin Pierce College, Rindge, N.H.
1975. Repertory Theatre Gallery, Bar Harbor, Me. “Vincent Hartgen paintings,” 25 watercolors.
1978. “Paintings from a Sabbatical,” October, 1978. Hartgen recent works at his Forest Avenue studio, 30 paintings.
1978, October. Benbo Gallery, Newport, R.I. “Vincent Hartgen Paintings,” 20 works.
1980, February. “Maine Artists Show,” United States Embassy, Ottawa, Canada, one of 25 Maine artists.
1980, May 11 – July 3. Farnsworth Museum, Rockland, Me. “Vincent Hartgen Paintings,” 25 works, with sculptor Clark FitzGerald; Wilson Museum, Castine, Me.
1982, June 27 – July 31. “Vincent Hartgen: Maine Seascapes & Landscapes,” Castine Scientific Society, Wilson Museum, Castine, Me.
1982. Retirement Exhibition, University of Maine Patrons of the Fine Arts, Orono, Me.
1989, Oct. 19- Nov. 21. “Hartgen Pen and Ink Drawings.” Central Place Galleries, Bangor, Me., with sculptor Clark FitzGerald.
1991, Nov. 14-Dec. 31. “Drawings of Maine: Vincent A. Hartgen,” Alternative Energy Building, Twenty South Street, Bangor, 41 drawings and paintings.
1992, Aug. 20 – Sept. 27. “Vincent Hartgen – Paintings” Maine Art Gallery, Wiscasset, Me.
1995. Oct. 1-Nov. 10. “Vincent A. Hartgen: Aquarelles & Drawings,” University of Maine at Michias Art Galleries, Machias, Me.
1996, Nov. 22- Jan. 12, 1997. “50th Anniversary Exhibition, University of Maine Museum of Art and Department of Art,” University of Maine, Carnegie Hall, Orono.
1996, Oct. 28-Jan.17, 1997. “Vincent Hartgen: Paintings and Drawings,” University of Maine Portland Centre, Portland, Me.
1998, May. “Vincent Hartgen: Paintings and Drawings,” Office of the Maine Senate, Maine State Capitol, Augusta, Me.
1999. Hinkley School Art Museum, Hinkley, Me., “Impressions of Katahdin.”
2000, Sept. 5-Oct. 31. “Drawings by Vincent A. Hartgen,” Art Etcetera, Maine Artists Gallery, Orono. brochure comment by Herbert Seligmann.
2002, October-November. “Vincent Hartgen, Landscapes,” Aucocisco Gallery, Portland,
“Vincent A. Hartgen: forces of nature;” Brochure with comments by the artist. Aucocisco website.
2004, Oct. 30. Posthumous “Hartgen At Ninety” Exhibit, University of Maine, Carnegie Hall, Orono. 16 watercolors and drawings.
2007, Oct. 15-Dec. 1. “A Legacy of Collecting: The Vincent A. Hartgen Years, 1946-1982,” University of Maine Museum of Art, Bangor, Me. Exhibit of art works collected by Hartgen and examples of his own works from the UMMA Collection of Hartgen paintings and drawings.