Geography of Harmon County, Oklahoma

by | March 15, 2024

Geography of Harmon County, Oklahoma

Harmon County, situated in the southwestern part of the state of Oklahoma, USA, is a region known for its diverse geography, rich history, and unique natural features. Spanning an area of approximately 539 square miles, the county offers a mix of rolling plains, rugged hills, and waterways. In this comprehensive overview, we will explore the geography, climate, rivers, lakes, and other notable features that define Harmon County. Check acronymmonster to learn more about the state of Oklahoma.


Harmon County is bordered by the counties of Beckham to the north, Greer to the east, Jackson to the south, and Hardeman County in Texas to the west. The county seat and largest city is Hollis, while other significant communities include Vinson, Gould, and Dryden.

The topography of Harmon County is characterized by its rolling plains and scattered hills, with elevations ranging from around 1,300 feet in the uplands to 1,000 feet in the low-lying areas. The county is intersected by several major transportation routes, including US Route 62 and State Highway 9, which provide easy access to Altus and other cities in the region.


Harmon County experiences a semi-arid climate, with hot, dry summers and mild winters. The region’s climate is influenced by its inland location and the prevailing weather patterns of the southern Great Plains.

Summer temperatures in Harmon County typically range from the 80s to 100s°F (27-38°C) during the day, with occasional heatwaves bringing temperatures even higher. Humidity levels are relatively low during the summer months, but periodic thunderstorms can bring heavy rainfall and localized flooding.

Winters in Harmon County are mild, with average temperatures ranging from the 30s to 50s°F (0 to 10°C) during the day and dropping below freezing at night. Snowfall is rare, but occasional winter storms can bring light accumulations of snow and ice.

Spring and fall are transitional seasons in Harmon County, with temperatures gradually warming in the spring and cooling in the fall. These seasons are favored by residents and visitors alike for outdoor activities such as hiking, camping, and exploring the county’s natural beauty.

Rivers and Lakes:

Harmon County is intersected by several creeks, streams, and rivers, which play important roles in the region’s ecology, economy, and recreational activities.

The Red River forms the southern border of Harmon County, separating Oklahoma from Texas. The river provides opportunities for fishing, boating, and water sports, as well as scenic views and wildlife habitat along its banks.

The North Fork of the Red River is another significant waterway in Harmon County, flowing from north to south through the central part of the county. The river offers opportunities for fishing, canoeing, and wildlife viewing, as well as hiking along its scenic banks.

In addition to its rivers and streams, Harmon County is home to several small lakes and reservoirs, including Lake Lloyd Vincent and the Upper and Lower Tom Steed Reservoirs. These bodies of water provide opportunities for fishing, boating, and picnicking, attracting residents and visitors alike to their shores.

Natural Features:

In addition to its rivers and lakes, Harmon County is known for its natural beauty and outdoor recreational opportunities, including parks, wildlife refuges, and hiking trails.

The Black Kettle National Grassland, located in the northeastern part of Harmon County, is a protected area that encompasses over 30,000 acres of grasslands, forests, and wildlife habitat. The grassland offers opportunities for hiking, camping, birdwatching, and hunting, as well as scenic drives along the Black Kettle Scenic Drive.

The Sandy Sanders Wildlife Management Area, located in the western part of Harmon County, is a protected area that provides habitat for a variety of plant and animal species. The area offers opportunities for wildlife viewing, photography, and nature study, as well as hunting and fishing in designated areas.

The Quartz Mountain Nature Park, located in the southeastern part of Harmon County, is a scenic park that features rugged hills, granite rock formations, and scenic overlooks. The park offers hiking trails, camping areas, and opportunities for birdwatching and wildlife viewing, as well as educational programs and guided tours.


Harmon County, Oklahoma, offers a diverse and scenic landscape characterized by its rolling plains, rugged hills, and waterways. From its historic towns and cultural landmarks to its natural beauty and outdoor recreational opportunities, the county has much to offer residents and visitors alike. As stewards of this remarkable landscape, residents and local organizations are committed to preserving and protecting Harmon County for future generations to enjoy. Through conservation efforts, sustainable development, and responsible stewardship of natural resources, Harmon County will continue to thrive as a vibrant and cherished part of Oklahoma’s Great Plains region.