Tillamook County paving lives or dies by the weather window. Ninety inches of rain a year, salt-laden onshore wind, and a US-101 traffic load that never really sleeps mean asphalt paving on the north Oregon coast asks more of the mix design and the schedule than almost anywhere else in the state. The honest answer for most property owners here is that a paving job done right between June and September will outlast two jobs rushed at the wrong time of year.
This guide walks through what asphalt paving looks like in Tillamook County, the soil and weather conditions that drive every spec decision, the pricing ranges to expect in the current market, and how to time a project around the dairy haul calendar and tourism peak.
County Seat Tillamook and the US-101 Corridor
Tillamook sits at the junction of US-101 and OR-6, which makes the city the commercial hub for the whole county. The downtown grid, the dairy-creamery campus, and the long retail spine south to Hebo carry steady traffic from delivery trucks, school buses, and seasonal RV traffic. Pacific City, Garibaldi, Rockaway Beach, and Manzanita each have their own small commercial cores where storefronts, lodging, and seafood plants share parking lots that take a beating from coastal weather and tourist volume.
North of Tillamook, the dairy economy shapes everything. Tillamook County Creamery Association trucks roll constantly between farms and the central processing plant. Heavy axle loads on warm asphalt cause rutting if the mix is not built for it. Property owners with farm-access apron paving, milking-barn approaches, or fleet yards need a tighter mix design and thicker lift than a standard retail lot would call for.
Coastal Salt-Air and Rainfall Drive Mix Design
Tillamook County asphalt has to handle two punishing realities. The first is rainfall. Most of the county sees 80 to 100+ inches of annual precipitation, and the wet season runs October through May. That collapses the practical paving window to roughly mid-June through mid-September, with a few good weeks on either shoulder if you watch the forecast.
The second is salt air. Onshore wind carries fine sodium chloride spray inland for miles, and that spray accelerates oxidation of the asphalt binder. A lot paved on the coast without a sealcoat plan will show greying and brittleness years sooner than a Willamette Valley lot. Cojo recommends an initial sealcoat 12 to 18 months after paving on coastal properties, then a re-application every 24 to 36 months, paired with the sealcoating in Tillamook County cadence rather than letting the binder break down.
Subgrade is the third variable. Dairy-pasture soils west of the Coast Range trend toward clay and bog peat with high water tables. Cuts deeper than 12 inches in those soils almost always need a perimeter drainage detail and a crushed-rock base of 6 to 8 inches minimum. Skipping that step is the single most common reason coastal driveways fail inside five years.
What a Tillamook County Paving Job Includes
A correctly scoped paving project in this county includes site survey and elevation shot, demolition or scarification of the existing surface, subgrade evaluation (and remediation if water shows up in the test pits), crushed-rock base placement and compaction, hot-mix asphalt placement in the right lift thickness, edge rolling, and breakdown rolling to spec density.
For most coastal commercial lots, Cojo specs a 1/2-inch dense-graded mix at a 3-inch compacted lift over 6 inches of crushed rock. Driveways and lower-traffic surfaces can drop to a 2-inch lift over 4 inches of rock. Anything carrying loaded dairy trucks gets a 4-inch lift, period.
Tack coat at the cold-joint edges, hand-work around drains and curbs, and a final compaction pass close out the work. Striping, if required, comes after a 30-day cure -- see parking lot striping in Tillamook County for the layout side.
Industry Baseline Range
| Project type | Typical scope | Industry baseline range |
|---|---|---|
| Residential driveway repave | 500 to 1,200 sq ft | $4 to $7 per sq ft |
| Small commercial lot | 5,000 to 10,000 sq ft | $3.50 to $6 per sq ft |
| Medium commercial lot | 10,000 to 25,000 sq ft | $3 to $5.50 per sq ft |
| Heavy-duty dairy or fleet apron | Per project | $5 to $8+ per sq ft |
| Overlay (no full tear-out) | Per project | $2 to $4 per sq ft |
| Patch and repair | Per square foot | $4 to $9 per sq ft |
Current Market Reality
Tillamook County paving prices in 2026 generally sit at the higher end of these ranges. The county has no local hot-mix plant, which means mix arrives via truck from Salem or McMinnville. Long haul distance raises both the mix cost and the schedule risk -- if a haul truck delays past the cooling window, the load is unusable. Coastal labor pools are thin in summer because tourism employers compete for the same workers. Add Oregon prevailing-wage requirements on any public work, rising diesel costs, and disposal fees for tear-out material, and a job that priced at $3.25 per sq ft in 2018 commonly runs $4.75 to $5.50 today. For context across the state, see asphalt paving cost in Oregon.
Best Paving Window for Tillamook County
The reliable paving window for this county is mid-June through mid-September. May and October can work if you watch a 5-day forecast and pick a stretch with overnight lows above 50 degrees F and no rain inside 48 hours of the pour. Outside that window, mix temperature drops too fast on the way down from the inland plant, and surface moisture prevents the tack coat from bonding.
Wet-season paving on the coast almost always shows up later as edge raveling, premature cracking, or full-section delamination. The savings from a winter price are wiped out by the early-failure repair cost.
Working With a Tillamook County Contractor
A contractor who works this coast knows to schedule pours for the rising temperature side of the day, not the falling side. They know to confirm haul routes that avoid the OR-6 grade if a slide is reported. And they know to coordinate with the creamery and US-101 ODOT corridor for any work that touches public right-of-way. Cojo Excavation and Asphalt has paved across the Oregon coast for years and brings the equipment, the mix-design spec, and the timing discipline that coastal sites demand.
Ready to plan your next paving project? Request a quote and we will walk the site, confirm the right mix and lift thickness, and put you on the next clean weather window.