| Boulder Airport | |
| Faa: | 3U9 |
| Type: | Public |
| Owner: | Town of Boulder & Jefferson County |
| City-Served: | Boulder, Montana |
| Elevation-F: | 4,968 |
| Elevation-M: | 1,514 |
| Coordinates: | 46.2117°N -112.1058°W |
| R1-Number: | 11/29 |
| R1-Length-F: | 3,675 |
| R1-Length-M: | 1,120 |
| R1-Surface: | Turf |
| Stat-Year: | 2007 |
| Stat1-Header: | Aircraft operations |
| Stat1-Data: | 600 |
| Footnotes: | Source: Federal Aviation Administration[1] |
Boulder Airport is a public airport located two miles (3 km) south of the central business district of Boulder, a town in Jefferson County, Montana, United States. It is owned by the Town of Boulder and Jefferson County.
Boulder Airport covers an area of 32acres and has one runway designated 11/29 with a turf surface measuring 3,675 by 72 feet (1,120 by 22 m). For the 12-month period ending August 13, 2007, the airport had 600 general aviation aircraft operations, an average of 50 per month.