Stage 1 fire restrictions, enacted for unincorporated areas of western Boulder County.

County Roadway Chip Seal Program

2024 chip sealing operations are anticipated to start in June.


Chip sealing work consists of applying asphalt to a road surface followed by a layer of one-quarter inch chips that essentially create a new layer on top of the road. A week after the chips are applied, crews return to the area to apply a sealant designed to help the chips adhere to the road. Finally, the sealant is followed by roadway striping operations. See to the right to view pictures of the process.

The roads and order of operations for 2024’s program are currently being determined. Check back in the spring for more information.

Chip sealing operations are part of the county’s primary network roadway rehabilitation plan. The process is intended to extend the lifespan of the roadway and postpone larger reconstruction efforts that would require more expensive work and longer travel restrictions. Primary network county roads are typically chip sealed every six to eight years.

The road will be a bit rougher than normal for a few weeks, but the vehicles driving on the road soon crush the chips down making for a smooth ride that will help the road last a lot longer than it normally would have.

To help cyclists, Boulder County uses a 1/4-inch chip instead of the typical 1/2-inch chip on the surface of the road. This greatly enhances rideability and helps the road smooth out quicker.

The exact start date for 2024 work has not been determined. Work takes place between 7 a.m. and 5 p.m., Monday through Thursday.

Check the closures and constructions page for updates about current road projects.

For more information on the work, contact Andrew Barth, via email or call 303-441-1032.

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Public Works Department (formerly Transportation)

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2525 13th St.
Boulder, CO 80304

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Boulder, CO 80306