YEAR	MILESTONE
1950s	Colorado's first leagues were formed in the 1950s, and Lamar Little League became the state's first participant in the international tournament in 1955. Lamar competed in a Region 6 district tournament that encompassed leagues from a far-reaching area that spanned from Colorado to Joplin, Missouri. Lamar continued to compete alongside teams from other states in tournaments leading up to the Region 6 tournament through the 1957 international tournament.
1958	The first Colorado state tournament is held, as two new Boulder leagues join Leadville and Lamar in a single-elimination tournament hosted by North Boulder Little League. The Colorado champion advances to the Western Region Division 4 tournament, where they compete alongside state champions from other Southwestern and Rocky Mountain states for a berth in the Western Region tournament.
1964	With Little League expanding throughout the state, Colorado adds a second district. Leagues West of the Rocky Mountains compete in District 1, and leagues East of the mountains are placed in District 2. The two district winners then meet to determine the state's champion.
1971	District 3 (Denver area) is formed as a split from District 2 (Boulder area and points North).
1972	The Colorado winner begins advancing directly to the Western Region tournament rather than first competing in a divisional tournament. Colorado's champion has continued to advance directly to regional tournament competition in every year since this time.
1977	District 4 (Colorado Springs area) is formed as a split from District 3.
1981	District 5 (Southern portion of the Denver metro area) is formed as a split from District 3. Also in 1981, Colorado officials use a double-elimination format at the state tournament for the first time.
1988	District 4 is dissolved, and its remaining leagues placed into District 5.
1994	District 3 is dissolved, and its remaining leagues are placed in District 2. A new District 3 is formed, and includes leagues located in Mountain communities.
2001	Colorado is assigned to the Northwest Region as Little League Baseball expands the Little League World Series from eight to sixteen participants.
2002	Colorado is re-assigned to the Southwestern Region as Little League Baseball opens a new headquarters for this region in Waco, Texas.
2013	District 4 is re-formed in the Durango area as a split from District 1.
2015	District 3 is dissolved.
2019	District 4 is dissolved.
2024	Colorado is re-assigned to the Mountain Region, and now competes in the Mountain Region tournament in San Bernardino, California.

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