Carr is an unincorporated community that used to have a U.S. Post Office in Weld County, Colorado, United States.

The U. S. Post Office was closed circa 2021 when the privately owned building, that was being leased by the USPS, became uninhabitable.

One of the local landmarks was a Geodesic Dome greenhouse just south of the post office on County Road 21 (a.k.a.

It is a natural limestone formation where many noted Indian battles took place between the Crow and Blackfeet tribes.

When just passing through, the size of the valley may seem relatively insignificant, but it is large enough for a temperature inversion to hold cold air in place in the wintertime.