Mountains for hikers & skiersMountains for hikers & skiersPeakSkies collects public mountain data in one place. Sources: USGS (GNIS, 3D Elevation Program), USDA Forest Service (trails, trailheads, campgrounds), Ski NH resort pages, Open-Meteo historical weather (ERA5), Wikidata, OurAirports and OpenStreetMap contributors. We never make up a figure; when a number is not published, we leave it out. Conditions change, so always check official sources before heading out.