In 1970, Denver was selected to host the 1976 Winter Olympics to coincide with Colorado's centennial celebration, but in November 1972, Colorado voters struck down ballot initiatives allocating public funds to pay for the high costs of the games, which were subsequently moved to Innsbruck, Austria.[43] The notoriety of becoming the only city ever to decline to host an Olympiad after being selected has made subsequent bids difficult. The movement against hosting the games was based largely on environmental issues and was led by State Representative Richard Lamm, who was subsequently elected to three terms (1975–87) as Colorado governor.[44] Denver explored a potential bid for the 2022 Winter Olympics,[45] but no bid will be submitted.[46] In 2010, Denver adopted a comprehensive update of its zoning code.[47] The new zoning was developed to guide development as envisioned in adopted plans such as Blueprint Denver,[48] Transit Oriented Development Strategic Plan, Greenprint Denver, and the Strategic Transportation Plan.

State Highway 470 (C-470, SH 470) is the southwestern portion of the Denver metro area's beltway. Originally planned as Interstate 470 in the 1960s, the beltway project was attacked on environmental impact grounds and the interstate beltway was never built. The portion of "Interstate 470" built as a state highway is the present-day SH 470, which is a freeway for its entire length.

Denver casillero