Big Valley Mountains

{{Short description|Mountain range in northeast California}}

{{Infobox mountain

| name = Big Valley Mountains

| native_name =

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| country = United States

| state = California

| region =

| district_type = Counties

| district = {{enum|Lassen|Modoc|Siskiyou}}

| topo_map = Day

| topo_maker = USGS

| border =

| range_coordinates ={{coord|41.1596036|-121.2969096|type:mountain_scale:300000|format=dms|display=inline,title}}

| range_coordinates_ref={{cite gnis|id=1652837|name=Big Valley Mountains|access-date=2009-05-04}}

| highest = Widow Mountain

| elevation_m = 1927

| coordinates = {{coords|41.1595228|-121.2971027|type:mountain|format=dms|display=inline}}

| coordinates_ref=

| length_mi = | length_orientation =

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| map = USA California

| map_relief = yes

| map_size = 220

| map_caption = Location of Big Valley Mountains in California

}}

The Big Valley Mountains are a mountain range that span northwest Lassen County, southwest Modoc County, and southeast Siskiyou County. The tallest peak in this range is Widow Mountain, which stands at {{cvt|1927|m|ft}} in Lassen County.{{cite GNIS|id=269058|name=Widow Mountain|access-date=2021-07-17}} The range is host to many springs that feed local creeks and reservoirs.

The communities of White Horse, Day, Lookout Junction, and Nubieber are located at or near the edges of this range.