Foster is an

unincorporated community An unincorporated area is a parcel of land that is not governed by a local general-purpose municipal corporation. (At p. 178.) They may be governed or serviced by an encompassing unit (such as a county) or another branch of the state (such as th ...

partly within the city of Sweet Home in Linn County,

Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington (state), Washington, while t ...

. It is located on the western end of the Foster Reservoir. A post office named Foster serves ZIP code 97345, which serves areas beyond the Sweet Home city limits on both the north and south sides of Foster Lake: on the north side, the area extends along the Middle Santiam River to the west end of Green Peter Lake; on the south, the area extends for several miles along the South Santiam River and U.S. Route 20.

Climate

This region experiences warm and dry summers, with no average monthly temperatures above 71.6 °F. According to the

Köppen Climate Classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

system, Foster has a warm-summer Mediterranean climate, abbreviated "CSB" on climate maps.Climate Summary for Foster, Oregon
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References

Unincorporated communities in Linn County, Oregon Unincorporated communities in Oregon {{LinnCountyOR-geo-stub