Crack Filling and Sealing in Denver, CO

Crack repair on asphalt means cleaning an open crack down to sound walls and filling it with a flexible compound so water cannot run through the pavement into the base. In Denver that single step does more for a driveway's life than any coating, because the airport records about 137 days a year when water sitting in a crack freezes and thaws within the same day. Every cycle pries at the edges. Sealcoat alone only bridges hairlines, so anything wider needs filling before the sealer goes down, and cracks that open over swelling clay need it every few years whether the surface is sealed or not.

Denver produces a recognizable set of cracks. Block cracking, the grid of rough rectangles common on older driveways, comes from asphalt shrinking as its binder ages, driven by daily temperature cycling; the airport's average daily swing is 28.4 degrees, and 30 in summer. Transverse cracks run straight across a driveway and open wider on cold nights, and the station logs about 65 nights a year at 20 degrees or colder. Then there are joints where asphalt meets a concrete apron, sidewalk or garage slab, which open every winter because the two materials move differently.

A fourth type is local to the Front Range. Where expansive clay sits under the pavement, the ground itself moves: the Colorado Geological Survey describes clay that swells 10 percent or more as it gets wet and lists cracked driveways among the results. Heave cracks tend to run in long lines, sometimes with one side higher than the other, and they reopen after filling because the movement is below the asphalt. Filling them is still worth doing, since each one is a channel for water to reach the clay and make the swelling worse.

The work itself is mostly cleaning. Crews clear each crack with compressed air or a hot-air lance, pull weeds and failed old filler, and may rout wide or ragged cracks so the filler has square walls to grip. Hot-pour rubberized compound goes in from a heated kettle and stays flexible through cold nights; cold-pour products need no kettle and suit a few narrow cracks. One manufacturer's specification calls for 50 degrees and rising before cold-applied fillers go down, and for the filler to dry before any sealer covers it. Pavement engineers list crack sealing as the usual repair for low-severity block and transverse cracking, and the coat that follows is covered under driveway sealcoating.

Timing in this climate favors late summer and early fall. The median first fall freeze at the airport is October 6, and cracks filled before that date go into winter closed. Prices are usually per linear foot, at $1 to $3 in the 2026 Angi and HomeAdvisor guides, with $100 to $400 typical for a whole residential driveway. The cost page lists the full set of ranges.