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Harper Lake
Louisville, CO · South Boulder County
What it's like in Harper Lake.
Harper Lake sits at Louisville's southern edge where the residential development gives way to open water and wetlands. The lake itself — a reclaimed surface mine reservoir — has been fully integrated into the community's identity: the trail that loops its perimeter is a neighborhood commons, and addresses with lake views carry a premium that has proven durable through multiple market cycles. It's an unusually pleasant anomaly for Louisville — water-adjacent living at a price point that remains significantly more accessible than anything comparable in Boulder proper.
By the numbers.
- Median Sale Price$795Kest. Q1 2026
- Price / Sq Ft$330est. Q1 2026
- Avg Days on Market15est. Q1 2026
- Walk Score38Car-Dependent
- Lake AccessDirectHarper Lake Open Space
Data estimated Q1 2026. Source: Compass Intelligence / Boulder County MLS.
“"Harper Lake addresses come with a trail loop, mountain views, and a morning routine that most people have to drive somewhere to find. The market has noticed."”
Local Expert Terra Brewer Compass Associate Broker
Work with Terra Day-to-day in Harper Lake.
The Harper Lake loop trail is 1.4 miles of paved and gravel path with bird watching, fishing access, and mountain views. The Coal Creek Trail connects north. Downtown Louisville is 10 minutes. The demographic is predominantly families and outdoor-focused professionals who found that Louisville's south end offered a water-adjacent lifestyle at a fraction of comparable Colorado lakeside addresses. The trade-off — a car-dependent daily routine — is standard for this part of the Front Range.
Schools within reach.
Five closest schools by distance. School attendance zones may differ.
- Coal Creek Elementary School0.1 mi
- Louisville Montessori School0.6 mi
- Fireside Elementary School0.8 mi
- Fusion Academy, Boulder County0.9 mi
- Louisville Elementary School1.1 mi
Ready to look?