The Evolution of Colorado's Legislative History
The political landscape of Colorado has undergone a significant transformation since the mid-19th century. Before becoming a formal state, the region was governed by a territorial body that laid the groundwork for the modern governance we see today. Understanding the transition from the Legislative Assembly of the Territory of Colorado to the current General Assembly is essential to understanding the state's political heritage.

The Territorial Era (1861–1876)
From the moment the Colorado territory was created in 1861 until it achieved statehood on August 1, 1876, the region was governed by the Legislative Assembly of the Territory of Colorado. Unlike modern legislatures, this body did not number its legislatures; instead, it organized its work by numbering its sessions. These sessions occurred periodically throughout the 15-year territorial period.
During this era, the location of the legislative sessions shifted between various hubs, including Denver, Colorado City, and Golden City. This movement reflected the evolving administrative centers of the growing territory.
The Brief 1865 State Legislature
A unique chapter in Colorado's history occurred in 1865. For a short period, Colorado operated under an approved state constitution and had already elected a legislature and other officials. The body met from December 12 to December 19, 1865, under the belief that statehood had been granted. However, this momentum was halted when President Andrew Johnson vetoed the corresponding enabling act, leading to the disbandment of the body that had met as a state legislature.
The General Assembly of the State of Colorado
Following official statehood in 1876, the governing body became known as the General Assembly. Since its inception, the General Assembly has met consistently in Denver. The first official state legislative session took place from November 1, 1876, through March 20, 1877.
Historically, the assembly followed a specific biennial schedule. From the first session until 1950, succeeding sessions met every two years during odd-numbered years (such as 1879, 1881, and 1883).
Election Cycles and Representation
The structure of the Colorado legislature is maintained through regular elections. With the exception of the inaugural election in October 1876, general elections are held on the first Tuesday following the first Monday in November of every even-numbered year.
The legislative branches are filled through a staggered election process:
- Representatives are elected every two years.
- Senators are elected every four years.
Key Facts
- Territorial Period: 1861 to August 1, 1876.
- Statehood Date: August 1, 1876.
- Legislative Seat: Denver has been the meeting location since statehood.
- Election Timing: General elections occur in even-numbered years.
- Term Lengths: Representatives serve two-year terms, while Senators serve four-year terms.
Summary of Territorial Sessions
| Session | Location(s) | Start Date | End Date |
|---|---|---|---|
| First Regular Session | Denver | September 9, 1861 | November 7, 1861 |
| Second Session | Colorado City, Denver | July 7, 1862 | August 15, 1862 |
| Third Session | Golden City, Denver | February 1, 1864 | March 11, 1864 |
| Fourth Session | Golden City | January 2, 1865 | February 10, 1865 |
| Fifth Session | Golden City, Denver | January 1, 1866 | February 9, 1866 |
| Sixth Session | Golden City | December 3, 1866 | January 11, 1867 |
| Seventh Session | Golden City, Denver | December 2, 1867 | January 10, 1868 |
| Eighth Session | Denver | January 3, 1870 | February 11, 1870 |
| Ninth Session | Denver | January 1, 1872 | February 9, 1872 |
| Tenth Session | Denver | January 5, 1874 | February 13, 1874 |
| Eleventh Session | Denver | January 3, 1876 | February 11, 1876 |
Frequently Asked Questions
When did Colorado officially become a state?
Colorado achieved statehood on August 1, 1876.
Where does the Colorado General Assembly meet?
The General Assembly has met in Denver since the state's founding.
How often are Colorado state legislators elected?
Representatives are elected every two years, while Senators are elected every four years on a staggered basis.
What happened to the 1865 territorial legislature?
Although they believed statehood had been approved, President Andrew Johnson vetoed the enabling act, causing the legislature to disband after meeting for only one week in December 1865.
When are general elections held in Colorado?
General elections are held on the first Tuesday following the first Monday in November during even-numbered years.