The Denver Public Library's Western History and Genealogy Department holds the largest concentration of LGBTQ+ archival material in the state, accessible at history.denverlibrary.org/research/lgbtq. Key collections include the GLBT Community Center Records (WH2360), PFLAG Denver Chapter Records (WH2397), and the Julia Condolora Papers (WH2449), along with records from Equality Colorado and other advocacy organizations.

Since 2015, the Colorado LGBTQ History Project has facilitated the donation of 30+ archival collections to DPL, creating a centralized repository for materials that might otherwise have been lost to apartment cleanouts, estate sales, and organizational closures. The library also holds the Rocky Mountain News photo archive, which contains documentary photographs of Amendment 2 protests, early Pride marches, and AIDS-era activism that are available for research use. LGBTQ+ Denver Guide

The Gill Foundation LGBTQ+ Archives at History Colorado represent a first: the first permanent LGBTQ+ collection at a state history institution anywhere in the United States. The collection includes over 500 artifacts and more than 20 hours of recorded oral histories, spanning from the territorial era to the present.

The collection is curated by Aaron Marcus, who joined History Colorado in 2020 as the nation's first LGBTQ+ curator at a state history museum. Marcus, an Emmy-winning documentarian, has brought a media-literacy approach to the archives, treating oral histories and personal ephemera with the same curatorial rigor traditionally reserved for institutional records. The "Rainbows & Revolutions" traveling exhibition, which opened in June 2022, draws from this collection and has toured venues across Colorado. Denver's LGBTQ+ History Before Stonewall

The Colorado LGBTQ History Project, housed at the Center on Colfax, has collected 115+ oral histories from LGBTQ+ Coloradans since its founding. The project has also assembled 30+ archival collections that have been donated to the Denver Public Library for permanent preservation. Digital access is available through lgbtqcolorado.cvlcollections.org, a searchable database hosted on the CVL Collections platform.

The project is led by David Duffield and can be reached at history@lgbtqcolorado.org. For researchers, the Center's oral history collection is the single most important primary source for understanding everyday queer life in Denver — the voices of people who lived through eras that left few official records.

CU Boulder's Archives holds the Boulder Gay Liberation Collection (COU:193), comprising 8.5 linear feet of materials from Colorado's university-based LGBTQ+ organizing. Colorado State University's Queer Memory Project (qmpnoco.org), led by Dr. Tom Dunn, has assembled 200+ items spanning 1861 to 2022, with a focus on Northern Colorado LGBTQ+ history.

Both university collections complement the Denver-based archives by documenting queer life outside the Front Range urban corridor. The CSU collection is particularly valuable for its coverage of rural and small-town LGBTQ+ experience in Colorado — a dimension of queer history that is often overlooked in favor of urban narratives.

Phil Nash's "LGBTQ Denver," published by Arcadia Publishing in 2024, contains approximately 200 photographs and is the most comprehensive published visual history of queer Denver. Tom Noel's 1978 article in the Colorado Magazine was the first published history of Denver's gay community. Keith Moore's 2014 thesis provides an academic framework for understanding Denver's queer geography.

History Colorado has received a $58,798 grant from the National Park Service to survey 25 LGBTQ+ properties across the state and designate three to the National Register of Historic Places. Currently, only two Colorado properties are recognized for LGBTQ+ significance: the First Unitarian Society of Denver (listed 2016) and the Boulder County Courthouse, where Clela Rorex issued the nation's first same-sex marriage licenses in 1975.

Only 2 Colorado historic properties are currently recognized for LGBTQ+ significance on the National Register: the First Unitarian Society of Denver (2016) and the Boulder County Courthouse. History Colorado's Heritage for All initiative aims to add 150 underrecognized sites by end of 2026.

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