Geography of Fremont County, Wyoming

Geography of Fremont County, Wyoming

Fremont County, located in the central-western part of the state of Wyoming, is a region of diverse landscapes, rich history, and abundant natural resources. Encompassing an area of approximately 9,266 square miles, Fremont County is the third-largest county in Wyoming by land area. Its geography includes rugged mountains, expansive plains, winding rivers, and pristine lakes, making it a haven for outdoor enthusiasts and nature lovers. Let’s delve into the geography of Fremont County, including its climate, rivers, lakes, and other notable features.

Location and Borders

According to Gradinmath, Fremont County is situated in the central-western part of Wyoming, bordered by several other counties and the Wind River Indian Reservation. To the north, Fremont County is bordered by Hot Springs and Washakie counties, to the east by Natrona County, to the south by Carbon County, and to the west by Sublette County. The county seat is Lander, while other significant communities include Riverton, Dubois, and Shoshoni.

Topography and Terrain

The topography of Fremont County is diverse, ranging from rugged mountain ranges to vast plains and rolling hills. The county is part of the Greater Yellowstone Ecosystem, which includes some of the most spectacular and ecologically significant landscapes in the United States.

The Wind River Range dominates the western part of Fremont County, with peaks soaring over 13,000 feet above sea level. This mountain range is renowned for its rugged beauty, pristine alpine lakes, and challenging hiking trails, including the popular Cirque of the Towers and Titcomb Basin.

To the east of the Wind River Range, the terrain gradually transitions into high desert plains, characterized by sagebrush, juniper trees, and wide-open spaces. The Wind River Basin, located in the central part of the county, is a broad valley surrounded by mountains, including the Owl Creek and Bridger Mountains.


Fremont County experiences a semi-arid climate, with cold winters, warm summers, and relatively low precipitation throughout the year. The region’s climate is influenced by its high elevation, mountainous terrain, and proximity to the Continental Divide.

Winter temperatures in Fremont County can be harsh, with average highs in the 20s to 30s Fahrenheit (around -6 to -1°C) and lows in the single digits to teens Fahrenheit (around -13 to -7°C). Snowfall is common in the mountainous areas, where several feet of snow can accumulate each winter.

Summer temperatures are milder, with average highs in the 70s to 80s Fahrenheit (around 21-32°C) and lows in the 40s to 50s Fahrenheit (around 4-10°C). However, temperatures can vary widely depending on elevation and proximity to mountain ranges.

Rivers and Waterways

Fremont County is traversed by several rivers and waterways, which play a vital role in shaping the region’s landscape and providing habitat for wildlife. The most significant river in the county is the Wind River, which flows through the western part of the county before joining the Bighorn River to form the Yellowstone River.

Other notable rivers in Fremont County include the Popo Agie River, the Little Wind River, and the Sweetwater River. These rivers and their tributaries provide opportunities for fishing, kayaking, rafting, and other water-based activities.

Lakes and Reservoirs

Fremont County is home to several lakes and reservoirs, both natural and man-made, that provide water for recreation, irrigation, and wildlife habitat. Notable lakes in the county include Fremont Lake, the largest natural lake in Wyoming, and Boysen Reservoir, a popular destination for fishing and boating.

Fremont Lake, located in the Wind River Range, is renowned for its crystal-clear waters, scenic beauty, and excellent trout fishing. Boysen Reservoir, located on the Wind River downstream from the Wind River Canyon, offers opportunities for camping, picnicking, and water sports.

Parks and Recreation Areas

Fremont County is a paradise for outdoor enthusiasts, with numerous parks, wilderness areas, and recreational opportunities available year-round. The county is home to parts of several national forests, including the Bridger-Teton National Forest and the Shoshone National Forest, which offer miles of hiking trails, camping areas, and scenic vistas.

In addition to national forests, Fremont County is home to several state parks, wildlife refuges, and wilderness areas. Notable parks in the county include Sinks Canyon State Park, Boysen State Park, and the Wind River Indian Reservation, which offers cultural and recreational activities for visitors.

Agriculture and Economy

Agriculture is an important part of Fremont County’s economy and heritage, with the region’s fertile soils and favorable climate supporting a variety of crops and livestock. Wheat, barley, hay, and potatoes are among the primary crops grown in the county, while cattle ranching and sheep grazing are also significant industries.

In addition to agriculture, tourism is a major driver of the economy in Fremont County, with visitors drawn to the region’s natural beauty, outdoor recreational opportunities, and cultural attractions. The county is home to several historic sites, museums, and cultural events that showcase its rich history and heritage.

Historical Sites and Landmarks

Fremont County has a rich history dating back thousands of years, with evidence of Native American settlements, fur trading posts, and pioneer homesteads scattered throughout the region. The county is home to several historic sites and landmarks that tell the story of its past, including the Oregon Trail, the Wind River Indian Reservation, and the South Pass City Historic Site.

One notable landmark in Fremont County is the Dubois Museum, which features exhibits on the region’s natural and cultural history, including Native American artifacts, pioneer tools, and geological specimens. Other notable historical sites in the county include the Lander Trail Historic Site, the Wind River Indian Reservation, and the historic towns of Dubois and Riverton.


Fremont County, Wyoming, is a region of breathtaking natural beauty, diverse landscapes, and rich history. From its rugged mountain ranges and pristine lakes to its wide-open plains and winding rivers, the county offers something for everyone to enjoy.

Whether hiking in the Wind River Range, fishing in Boysen Reservoir, or exploring the cultural heritage of the Wind River Indian Reservation, visitors to Fremont County are sure to be captivated by its charm and hospitality. With its diverse geography, vibrant communities, and strong sense of history, Fremont County is a hidden gem of the Rocky Mountain West, inviting travelers to explore its wonders and create lasting memories.