Land for sale in Summit County, Colorado, recently totaled nearly $653 million and nearly 1,000 acres. Summit County ranks 24th in the state for the total number of acres of land currently advertised for sale. Of all locations in Summit County with land for sale, Breckenridge had the most land for sale. Based on its natural assets, tourism and recreation contribute significant revenue toward Summit County's overall GDP. Summit County is the 55th largest county (619 square miles) in Colorado. It's located in the Northwest Colorado region of the state.