Boulder County spans an extraordinary elevation range — from the eastern plains near the Weld County line at roughly 5,000 feet to the Indian Peaks Wilderness above 13,000 feet — producing distinct weather patterns, fire risk profiles, and flood histories across its communities. Each city and community page covers current conditions via live weather data, stream flow where a USGS gauge is nearby, fire risk anchored on named recent events, and FEMA flood zone designation for that specific location.
Plains and the US-36 Corridor
- Longmont weather -- St Vrain Creek city, 2013 flood, 5,000 ft
- Erie weather -- eastern plains, Boulder/Weld county line, 5,026 ft
- Hygiene weather -- Left Hand Creek agricultural CDP, 5,069 ft
- Niwot weather -- Diagonal Highway CDP, Left Hand Creek, 5,095 ft
- Lafayette weather -- US-36 corridor, Coal Creek drainage, 5,237 ft
- Louisville weather -- US-36 corridor, Marshall Fire 2021, 5,337 ft
- Broomfield weather -- its own county since 2001, open-plains wind, 5,420 ft
- Superior weather -- Marshall Fire ground zero, 5,485 ft
Foothills and Canyon Mouths
- Lyons weather -- St Vrain Canyon gateway, 2013 flood, 5,374 ft
- Marshall weather -- 2021 Marshall Fire ignition area, wind gap, 5,500 ft
- Eldorado Springs weather -- South Boulder Creek canyon mouth, FEMA zone AE, 5,732 ft
- Pine Brook Hill weather -- foothills bench above north Boulder, 6,400 ft
Mountain Communities
- Jamestown weather -- 2013 flood, CalWood Fire evacuation, 6,920 ft
- Sugarloaf weather -- southern edge of the 2010 Fourmile burn area, 7,200 ft
- Nederland weather -- Peak to Peak, Barker Reservoir, 8,228 ft
- Gold Hill weather -- historic mining town inside the Fourmile burn area, 8,463 ft
- Allenspark weather -- Wild Basin, RMNP southern entrance, 8,491 ft
- Eldora weather -- ski-area townsite west of Nederland, 8,642 ft
- Coal Creek Canyon weather -- tri-county corridor on Highway 72, 8,754 ft
- Ward weather -- highest incorporated town in the county, 9,450 ft