Property Tax Appeals by County: Denver, Jefferson, Boulder, Arapahoe and Beyond

The appeal *process* is set by state law, but the *details* — deadlines, online portals, how the assessor publishes data, and which neighborhoods tend to be over-valued — vary county to county. Here's how the major Colorado counties differ and where to start.

The Front Range metros

• Denver — dense urban comps and frequent record quirks on older infill homes. Denver guide.
• Jefferson — foothill homes (Evergreen, Conifer, Golden) where terrain and access vary block to block, making comps tricky and condition arguments strong.
• Arapahoe & Adams — fast-growing suburbs (Aurora, Centennial, Thornton, Brighton) where new-build comps get applied to older homes.
• Douglas & Boulder — high values and thin comp pools; Boulder's older near-campus homes are routinely valued like new construction.
• Broomfield — a compact city-and-county with its own assessor and consistent suburban stock.

Beyond the metro

• El Paso (Colorado Springs) — the state's largest county by population; high appeal volume and a searchable assessor portal.
• Larimer (Fort Collins, Loveland) and Weld (Greeley, Windsor) — northern growth corridors with rapid value increases.
• Pueblo — southern Colorado values that often lag metro comps, so over-valuations stand out.
• Mesa (Grand Junction) — the Western Slope hub with strong public assessor data.

What's the same everywhere

Every Colorado county follows the same ladder — Notice of Valuation, assessor protest (around June 8), Notice of Determination, then the County Board of Equalization. The full process is here, and the deadline calendar is here.

Start with your address, not your county

You don't need to know your county's rules to begin. Enter your address and we detect your county, pull its actual records, and handle the county-specific deadlines and forms for you — across the Front Range and the Western Slope.