Hanson Field in Breckenridge was located at the site that later became the Breckenridge STOLport area in Breckenridge, Colorado, and that land is now used for an elementary school, housing, and ski resort parking.

Location

The source identifies the former airport site as being in Breckenridge, Colorado, with Airport Road still tracing the old field’s footprint.

Note

There is also a separate Hanson Field in Macomb, Illinois, so the Breckenridge reference appears to be the former airfield, not the stadium.

TL;DR: it was in Breckenridge, Colorado, at the former STOLport/airfield site near what is now Airport Road.