Crack Filling and Crack Repair in Fort Collins, CO

Crack filling means cleaning out open cracks in asphalt and packing them with hot-pour rubberized sealant, which shuts the path that snowmelt and rain would otherwise take down to the base. In Fort Collins it is often the single most useful thing an owner can do before winter. The Town of Timnath seals cracks a quarter inch and wider on its own streets with exactly that material, and crack seal is one of the treatments the city's Street Maintenance Program uses to extend the life of its streets. Under many local drives sits clay: the Nunn series, typed in Larimer County, runs 35 to 50 percent clay with slow permeability, so water that gets down a crack tends to stay there. Crack repair keeps it out; a coat of sealer over open cracks does not.

Cracks here open and close with the temperature. Asphalt shrinks in the cold and expands in the heat, and the campus station's normal daily swing between high and low is about 27 degrees. Cracks running straight across a drive at intervals are usually thermal, and they are widest on the coldest mornings. Add roughly 131 days a year when water in a crack freezes overnight and thaws by afternoon, and each winter pries the edges a little further apart. A filler for this job has to stretch in January and squeeze in July, which is why hot-pour rubberized products are the standard and rigid caulks from a tube are not.

The work is mostly cleaning and heat. Dirt, weeds and crumbling edges come out first, blown clear with compressed air or dried with a heat lance, since rubber sealant grips clean, dry asphalt and little else. A wide or ragged crack may be routed into a square channel so the filler has walls to hold. The sealant is melted in a kettle, poured or wand-applied, and struck flush or banded a little over each edge. On a typical local drive the list includes the transverse cracks, the long crack that forms a foot or so in from an unsupported edge, and the joint where asphalt meets the concrete approach or garage slab.

Fall is the natural season. By October the campus station averages highs of 64.3 degrees and lows of 36.1, cool enough that cracks have opened toward their winter width and warm enough for the filler to bond, and the median first freeze does not arrive until October 6. Spring works as well, once March, the snowiest month, is finished with the pavement. What matters most is that open cracks do not go into December unfilled, since December and January each average about 25 freeze-thaw days on the monthly normals. Filled cracks can be sealed over the following summer.

Angi's 2026 repair guide prices crack filling at $1 to $3 per linear foot and $100 to $400 for a typical driveway's worth of cracks, and HomeGuide's range starts at $0.50 per foot. Footage drives the total, so a bid should state the linear feet measured and the product. The cost page lists these sources with the rest.