The weather station on the CSU campus logs about 131 days a year when asphalt freezes overnight and thaws by afternoon. Sealcoating keeps that meltwater on top of the pavement instead of inside it.
The weather record kept on the Colorado State University campus, just northwest of the Lory Student Center, runs back to January 1, 1889, which makes it one of the oldest in the state. NOAA's 1991-2020 normals for that station count 146.8 nights a year at or below 32 degrees and only 16.2 days when the high never climbs above freezing. Subtract one from the other and roughly 131 days remain on which asphalt freezes at night and thaws by afternoon. That crossing, repeated all winter, is what pries a driveway apart, and it is the number the rest of this site starts from.
The rest of the local record explains why the crossing does so much damage. The same station averages only 16.10 inches of precipitation a year, yet 55.8 inches of snow, and on the monthly normals March is the snowiest month at 9.4 inches. Much of that snow is left to melt where it lands: the city does not routinely plow residential streets, citing lower traffic, cost and the frequent sunny weather that clears them. Meltwater runs across driveway aprons by day and refreezes in the joints at night. Seal coating exists to close the surface so that water runs off instead of soaking in.
Growth set the age of the pavement. The city held 14,937 people in 1950, 87,758 in 1990 and 169,810 at the 2020 census, and the average home dates to 1991 by BestNeighborhood's reading of the 2020-2024 American Community Survey. That spread puts a large share of local drives in their second or third decade, the stage at which the original binder has dulled, fine cracks have opened and a first round of driveway sealing either happened on schedule or did not.
Nothing on this site is a sales pitch for a particular crew: it explains Fort Collins asphalt in plain language and hands quote requests to independent local contractors, and they carry out the work. The cost page lists observed price ranges with the source behind each row, the pavement weather data page shows every station figure used here, and the interval guide works through how often a drive in this climate needs a fresh coat.
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Two coats of sealer over a cleaned, crack-filled asphalt drive, timed to the months when Fort Collins nights stay warm and kept off the concrete approach at the street.
Typical: $0.30 - $1.50 per sq ft; $220 - $370 for a 720 sq ft drive at the 2022 local rate
Cleaning out and sealing every crack a quarter inch or wider with hot-pour rubber before winter, so snowmelt stops draining through the asphalt into the clay beneath Fort Collins drives.
Typical: $1 - $3 per linear ft; about $100 - $400 for a typical driveway
Full-depth repairs and pothole fixes for Fort Collins asphalt where spring meltwater and a clay subgrade have left soft spots, sunken wheel paths or holes that keep reopening.
Typical: $100 - $500 per patch; saw-cut full-depth work about $4 - $12 per sq ft
Sealing commercial, church and apartment lots section by section in the short summer window, with a product choice that matters where lot runoff drains toward the Poudre.
Typical: $0.14 - $0.25 per sq ft for sealer alone; $0.60 - $0.90 with crack sealing and striping
Laying out and repainting stalls, accessible spaces, fire lanes and arrows after a lot is sealed, sized to the federal restriping rules and renewed as plows and snow stacks wear them.
Typical: $5 - $20 per stall; accessible stalls $25 - $50 each; arrows $10 - $30 each
Dates on a calendar for yearly crack filling, sealing every two to four years and prompt patching, modeled on the preventive approach Fort Collins takes with its own streets.
Typical: Crack filling $1 - $3 per linear ft yearly; sealing $0.14 - $1.50 per sq ft every 2 - 4 years
New and replacement asphalt driveways built on a base sized for local frost and clay, with the concrete approach and its permit handled under the county street standards.
Typical: $3 - $12 per sq ft installed; overlays about $2 - $4 per sq ft
Advice written for Denver, or for the country as a whole, misses the local figures. The climate numbers on these pages are NOAA's 1991-2020 normals for the Fort Collins station on the CSU campus, with the Fort Collins 4 E and Loveland 2 N stations added for the edges of town. That is why the sealing window on this site runs from a May 1 median last freeze to an October 6 median first freeze.
Published figures for the same job disagree by several times over, depending on the year and the source. The published price ranges show a Fort Collins survey next to national and Colorado guides, name the source for every row and state the driveway size each total assumes, so a written bid can be read against something checkable instead of a number heard on the phone.
In Fort Collins the strip between a driveway and the street is governed by the Larimer County Urban Area Street Standards and by city permits, not by whoever happens to be sealing the drive. This site says where the private asphalt ends, which work needs a Sidewalk and Drive Approach Permit, and why a sealing crew should mask the concrete approach instead of coating it.
The quote form sends a request to independent contractors who work in Fort Collins and the nearby Larimer County towns. They inspect, price and do the work under their own names. Nothing on this site is a quote, and no page pretends that a crew can price a driveway it has not measured.
A useful visit starts with a tape measure and a look at the curb. On streets built to the county standards, the approach between the street and the right-of-way line is concrete, so the job is priced on the private asphalt alone. The same walk sorts the surface: gray and porous with hairline cracks is a sealing job, open cracks need filling first, and soft or sunken spots are base failures to patch before any coat.
Two decisions come before any work starts. The product: coal tar is legal in Colorado, but runoff here reaches creeks and the Poudre untreated, so the bid should say plainly whether it is coal tar, asphalt emulsion or acrylic. The day: SealMaster wants 50 degrees and rising for 24 hours with no rain, which on the campus record points to a dry morning between June and August.
Grass is edged back, the surface is blown and swept, and oil drips are primed so the coat can grip. City code bars raking or blowing leaves, grass and branches into the street, so the sweepings go in a bag rather than the gutter. Cracks a quarter inch and wider are cleaned and packed with hot-pour rubberized sealant, the material Timnath uses on its own streets; the crack filling page has the details.
Two coats go on, the first worked into the surface pores and the second once the first has dried, with a third on heavy-traffic spots. The concrete approach and garage slab stay masked throughout. Then the drive rests: a full day before cars, longer when nights are cool, and one night of parking on the street is the usual price of a coat that lasts.
Two soil series tell most of the story under local driveways. The Fort Collins series is named for the city, and its typical profile was described about one block north of LaPorte Avenue on North Shields Street: a well-drained loam formed in wind-blown sediment and alluvium on terraces and fans, with 18 to 35 percent clay in the subsoil and lime starting 8 to 20 inches down. The Nunn series, whose type location is also in Larimer County, is a different ground altogether, with 35 to 50 percent clay, smectitic mineralogy and moderately slow or slow permeability. The Colorado Geological Survey names montmorillonite as the clay generally responsible for swelling in the state and lists cracked driveways among the results. Water that reaches a clay subgrade through an open crack does not drain away quickly.
The freeze-thaw count is not spread evenly through the year. On the station's monthly normals, December and January each bring about 25 days that cross the freezing line, November and February about 22, and March still about 20, while May has barely one. Winter afternoons stay mild enough to keep the cycle going: in an average December through February, 61 afternoons reach 40 degrees and about 30 reach 50, against 84 nights that drop to freezing. On about 33 winter days the campus has at least an inch of snow on the ground. Sun on packed snow at midday, running water by afternoon and ice in the cracks by morning is the ordinary winter week here.
City streets run on a schedule a homeowner can learn from. The Street Maintenance Program, paid for by a quarter-cent street maintenance tax that voters extended in November 2024 for 20 years through 2045, chooses treatments from detailed inspections and pavement condition scores and lists crack seal, slurry seal, chip seal and overlays among the work it does to extend road life. Residential streets are swept four times a year and major streets every two weeks. Snow is handled in four priorities, with more than 1,050 lane miles of arterials, collectors and school routes ahead of neighborhood streets, which are plowed only when blocked or in an emergency. The city does not clear driveways, and owners have 24 hours after a snowfall to clear the sidewalk.
The strip between a driveway and the street follows the Larimer County Urban Area Street Standards, which Fort Collins, Loveland and Larimer County adopted in a version effective August 1, 2021. They call for Portland cement concrete from the edge of the street pavement to the edge of the right-of-way, so on streets built or rebuilt to that standard the asphalt drive ends where a concrete approach begins. Residential approaches must be 12 to 24 feet wide, or up to 30 feet for a three-car garage, and the drive may be no steeper than 8 percent within 20 feet of the gutter flowline. A permit comes before any access is built or rebuilt, and in the city, work on an approach needs a Sidewalk and Drive Approach Permit and a contractor holding the Right-of-Way Contractor License.
Rain and snowmelt that leave a driveway do not go to a treatment plant. Fort Collins Utilities, which has operated a stormwater utility since 1980, says most stormwater flows through storm sewers to local creeks and the Cache la Poudre River untreated. The monthly stormwater charge is built from lot size and a runoff factor between 0.25 and 0.95 set by the share of the lot that is impervious, with 0.4 listed as typical for a house. No Colorado state, county or city restriction on coal-tar sealer appears on the national ban list kept by Coal Tar Free America, and the USGS says coal-tar sealcoat is used more on the eastern side of the Continental Divide, which includes Fort Collins, and contains roughly a thousand times as much PAH as asphalt-based sealcoat. Which product is in a bid is worth asking.
Frost reaches deep enough to matter. The city's building code sets a 30-inch frost depth for design, and the county street standards require swell testing whenever soil samples show probable expansion above 2 percent. Newer pavement is concentrated in the surrounding towns: the average home in Loveland dates to 1990, in Wellington to 2007, in Windsor to 2008 and in Timnath to 2015, where the population went from 625 in 2010 to 6,487 in 2020. Owner occupancy in Fort Collins itself is 51.6 percent, lower than in any of those four towns, which run from 62.2 percent in Loveland to 82.6 percent in Timnath.
Every range on this page is an observed market figure drawn from published cost guides and one Fort Collins survey, not a quote. The sources disagree more than most readers expect: HomeBlue's May 2022 survey of Fort Collins pricing put driveway sealing at $0.30 to $0.50 per square foot, national guides from Angi and HomeAdvisor updated in 2026 put it at $1.25 to $1.50, and Angi's typical Colorado job lands between $880 and $1,690. Each row names its source and, where a total is given, the driveway size behind it.
| Service | Typical Fort Collins Range |
|---|---|
| Driveway sealing, Fort Collins survey rate (HomeBlue, May 2022) | $0.30 - $0.50 per sq ft |
| Two-car drive, 24 x 30 ft (720 sq ft), at that survey rate | $220 - $370 |
| Driveway sealing, national guides (Angi and HomeAdvisor, 2026) | $1.25 - $1.50 per sq ft |
| Typical Colorado sealing job (Angi state figure, 2026) | $880 - $1,690 |
It depends on which published figure is used. HomeBlue's Fort Collins survey from May 2022 put sealing at $0.30 to $0.50 per square foot, or $220 to $370 for a 24 by 30 foot two-car drive of 720 square feet. National guides from Angi and HomeAdvisor, updated in 2026, quote $1.25 to $1.50 per square foot, and Angi's Colorado figure for a typical job runs $880 to $1,690. The full price table shows every row with its source. Measured square footage, crack footage and the number of coats move a bid more than anything else.
The frost-free window on the CSU record runs from a median last 32-degree night on May 1 to a median first one on October 6, about 159 days. Sealer needs more than frost-free weather, though: SealMaster's guidance is 50 degrees and rising for 24 hours with no rain in that period. At the campus station, 25.8 of May's nights and 19 of September's fall to 50 or lower, against 9.5 in June and fewer than 3 in July and August. Midsummer is the dependable stretch, and May and September work on warm spells.
Every two to three years is the common guidance for residential asphalt, and HomeGuide gives that interval after a first coat at about one year old. Exposure moves it. A south-facing drive with no shade that sheds snowmelt all winter wears toward the short end, and a drive under street trees wears more slowly. A fresh coat every summer only thickens the layer until it starts flaking off by itself. The guide to sealing intervals explains how to read a surface and set a schedule.
Yes. No coal-tar sealant ban for Colorado, Larimer County or the city appears on the list kept by Coal Tar Free America, while states such as Minnesota, Washington, Maine, New York, Maryland and Virginia have one. Legal is not the same as preferred, though. Local stormwater reaches creeks and the Poudre without treatment, and USGS testing found runoff from coal-tar-sealed pavement still toxic to minnows and water fleas weeks after application, so an owner can specify an asphalt-emulsion or acrylic sealer instead. A written bid should name the product either way.
Not routinely. Fort Collins plows in four priorities, starting with arterials such as College and Prospect, then collectors, then school zones and bus routes. Residential streets come last and are plowed only if blocked or during emergencies, and the city states that it does not clear driveways. Owners must clear the sidewalk within 24 hours after a snowfall. Shoveling the drive before the sun turns packed snow into meltwater keeps water out of the joint at the concrete approach, where it would otherwise refreeze overnight.
The approach between the street and the property line sits in public right-of-way. Under the Larimer County Urban Area Street Standards it is concrete from the edge of the street to the edge of the right-of-way, and work on it in Fort Collins needs a Sidewalk and Drive Approach Permit pulled by a contractor holding the city's Right-of-Way Contractor License. Asphalt sealer does not belong on that concrete. A careful driveway sealing job stops at the joint and masks it off.
Not in its first weeks. SealMaster's guidance is to let new asphalt cure a minimum of 30 to 60 days, and HomeGuide suggests waiting about a year for the first coat. Here the calendar usually decides: a drive paved in late summer finishes its cure just as nights start dropping below 50 degrees, so the first coat waits for the following June. The paving page covers base depth, frost and the permits a new drive needs.
They affect what happens underneath it. The Nunn series, described from a type location in Larimer County, carries 35 to 50 percent clay with slow or moderately slow permeability, and the Colorado Geological Survey lists cracked driveways among the damage swelling clays cause. Sealer cannot stop a subgrade from moving. What it and hot-pour crack filling can do is keep surface water away from that clay, which is the part an owner controls, along with downspouts and grading that move water off the pavement edge.
On the station record, yes. The CSU campus station counts 146.8 nights a year at or below freezing. The Fort Collins 4 E station, east of campus, counts 163.9, and Loveland 2 N counts 181.1, with a median last spring freeze of May 10 and a first fall freeze of September 28. Subtracting the days that never thaw leaves roughly 131, 143 and 163 freeze-thaw days. Driveways at the edges of town see more crossings than the campus figure suggests, which is one more reason to fill cracks every fall.
After, in most cases. The Street Maintenance Program posts No Parking signs at least 24 hours ahead and does most of its work Monday through Friday between 7 a.m. and 6 p.m., using treatments that run from crack seal and slurry seal to chip seal and overlays. Street work brings trucks, rollers and loose material to the end of the drive, and a fresh coat is easier to protect once that is finished. The street resurfacing article explains how to check the city's project map and plan around it.
Describe the size and condition of the asphalt, and independent contractors who work in Fort Collins and nearby Larimer County towns will see the request.
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