Quincy lies atop a part of the Columbia River Basalt Group which is overlain by Pleistocene outburst flood deposits.

Quincy was founded as a railroad camp during construction of the Great Northern Railway in 1892, and was incorporated on March 27, 1907.

Quincy has long had an agricultural economy, which was enhanced by irrigation made possible with the Grand Coulee Dam.

An investigation into the dumping of toxic waste onto farmland and its relabeling as fertilizer in Quincy was the subject of the 2001 book Fateful Harvest.

Technology companies such as Microsoft, Yahoo!, Dell and Intuit have located large data centers within the Quincy area since 2007.

[15] The centers, attracted to the area because of its abundant and cheap hydroelectricity, have been criticized for dodging fines from the Grant County Public Utility District for overusing electricity and for creating air pollution through their diesel backup generators.

[16] The data centers are incentivized by tax credits offered by the state of Washington to stimulate economic development in the city.

Two additional electrical substations are being built to handle expected demand from current and future companies.

For a month beforehand, the roads leading to town are decorated with signs showing local crops and products made with them.

On the day of the celebration, floats created by local schools and farm equipment parade through town.

Free agricultural and geology tours are offered, as well as a produce sale, tractor pull, Farm-to-Market fun run, and many other activities.

The park is also home to a large field with a baseball diamond, playground, picnic area, and small skate-park.