Excavation
Fence Post Hole Digging Cost in Oregon: Per-Hole Auger Pricing
Cojo
April 18, 2026
10 min read
Fence projects are one of the most common small excavation scopes a homeowner runs into, and post hole digging is where the hidden costs usually show up. The price per hole looks straightforward until you hit rock, or clay, or a buried utility, or any of the other conditions that turn a "quick" auger job into a half-day on a single hole.
This guide covers 2026 Oregon pricing for fence post hole digging. Whether you're planning 15 holes for a backyard fence or 250 for a rural pasture perimeter, the numbers below reflect what real Oregon contractors charge when you add up the true cost per hole.
A mini-excavator with an auger attachment and an operator can drill holes fast — in good soil. In Willamette Valley clay after a wet winter, or in Central Oregon basalt, the same machine moves a fraction as fast. Oregon's geography is why per-hole ranges span so widely — and why the broader excavation cost factors guide is worth reading before you finalize a budget.
Published per-hole rates from national sources often assume ideal conditions: dry loamy soil, standard 24–36 inch depth, 8–12 inch diameter, open access, no rock. Real Oregon sites frequently include at least one of: rock, clay, slope, roots, or utility conflicts.
Industry Baseline Range
| Scope | Unit | Industry Baseline |
|---|---|---|
| Standard post hole (dry loam, 36" deep, 10" wide) | per hole | $15 – $60+ |
| Clay soil hole | per hole | $25 – $85+ |
| Rocky soil hole | per hole | $40 – $150+ |
| Very rocky / hand-chisel hole | per hole | $75 – $300+ |
| Deep hole (48"+) for corner or gate post | per hole | $30 – $120+ |
| Large-diameter hole (16"+ for cedar or steel) | per hole | $45 – $175+ |
| Small job (under 10 holes) | per hole | $40 – $120+ |
| Mid job (10–50 holes) | per hole | $20 – $70+ |
| Large job (50+ holes, efficiency kicks in) | per hole | $15 – $50+ |
| Mobilization | flat | $250 – $800+ |
| Minimum job callout | flat | $500 – $1,500+ |
The industry baseline ranges above represent ideal conditions — easy access, workable soil, shallow depth, minimal haul-off. In practice, actual project costs frequently exceed published averages by 2 to 3 times when complications arise. Oregon's clay soils, rocky terrain, unmarked utilities, permit requirements, and disposal fees can all push costs well above baseline figures. The only reliable way to know your actual cost is through an on-site assessment.
Post hole digging hits a surprising number of hidden conditions:
The same fence project can price differently from one contractor to another based on how they handle these variables.
Sandy or loamy: Fastest. Auger goes down quickly, clean holes, minimal effort per hole. Lower end of the range.
Clay: Slower. Clay grabs the auger, slows rotation, and pulls out in slabs rather than clean cuttings. Wet clay is worse than dry. Expect 30–50% longer per hole.
Rocky: Dramatically slower. May require a rock auger, a hammer attachment, or hand chiseling. Some holes simply can't be drilled by a standard auger.
Mixed: The worst-case scenario. Each hole is different. Pricing is usually by the hour rather than per hole on sites with unpredictable conditions.
Standard residential fence post holes are 24–36 inches deep. Corner posts, gate posts, and wind-exposed fences go 36–48 inches. Each additional foot of depth adds roughly 15–25% to the per-hole cost because the last foot is always slower than the first.
6-inch holes go fast. 10-inch standard holes are the norm. 14-inch and larger holes for heavy cedar posts or steel 4x4 take noticeably longer.
Mobilization is the same whether you drill 5 holes or 50. Per-hole cost drops sharply above 25 holes. Small jobs under 10 holes usually fall under the minimum callout.
Can the auger truck or mini-excavator drive to each hole, or does the operator carry a handheld auger up a slope? Access dictates equipment, and equipment dictates price.
| Job Size and Conditions | Typical Time |
|---|---|
| 10 holes, easy soil | 2–4 hours |
| 25 holes, easy soil | Half-day |
| 50 holes, mixed soil | 1 day |
| 100 holes, rural pasture | 1.5–3 days |
| 250 holes, large property | 4–7 days |
| Rocky conditions | Add 50–100% to all timelines |
Heavy clay is the default in Portland, Salem, Eugene, and throughout the Willamette Valley. In the rainy season (November–May), clay turns into something between concrete and peanut butter. Wet-clay post holes can take 3–5x longer than dry-season holes. If the fence line also runs through blackberry or dense vegetation, factor in brush clearing cost before the auger can even reach the line.
Bend, Redmond, Prineville, and most of the high desert have basalt near the surface. Every hole is a negotiation with rock. Some contractors use percussion attachments or break rock by hand. Per-hole rates run at the high end of the range or above.
Coastal fences take more wind than inland fences. Post depths of 42–48 inches are common, and corner posts may need concrete collars. Plan for more expensive holes than inland rates.
Rural properties often have soft roads, gates, and distance from the nearest hard surface. Mobilization can exceed $500–$800 when equipment has to navigate long rural access — one reason bundling post holes with a larger job like small lot clearing or residential land clearing almost always pencils better.
Post holes fill with groundwater in wet soil. Concrete pours are less reliable in saturated soil. Many Oregon fence jobs are best scheduled May–October.
State law requires an 811 call at least 2 business days before any excavation, including post holes. Locate tickets are free. Ignoring the requirement can result in fines and liability for any cut utilities.
Different tools fit different scales.
Hand auger or post-hole digger: DIY-only. Works for 5–10 holes in easy soil. Useless in rock or heavy clay.
Two-person gas auger: Homeowner rental. $75–$150+ per day. Works for 10–30 holes in average conditions. Brutal on the operator.
Hydraulic skid steer or excavator auger: Contractor standard. Drills 25–50+ holes per day depending on conditions. Handles rock with the right bit.
Truck-mounted auger: For heavy commercial or large-scale agricultural fencing. Rare on residential jobs.
Fewer than 10 holes, good soil, flat access, and a willing back — DIY is viable with a rented two-person gas auger. Your cost will be the rental, the gas, the concrete, the posts, and a long weekend.
DIY stops making sense when:
A professional crew with the right auger does in a day what a homeowner does in a weekend, with clean consistent holes and proper utility discipline. If you're interviewing contractors, the guide to hiring a residential excavation contractor covers exactly what the written scope should include — depth, diameter, rock policy, and mobilization.
Permit costs typically run $100–$400+ per permit.
Post hole digging looks like a simple line item until you're on hole 40 of 60 in January clay at 3pm and the auger is locked up. Getting a real quote starts with a site walk and soil probe.
Cojo does fence post hole digging across Oregon — residential, agricultural, and small commercial projects. Post-hole work often pairs well with follow-on scopes like backyard grading or prep for landscape boulder placement inside the new fence line. Get a free excavation estimate, see examples on our project portfolio, browse our excavation services, or read related resources.
How much does it cost to dig fence post holes in Oregon? Industry sources have historically reported fence post hole digging at $15 to $60+ per hole in standard conditions, with clay adding $25 to $85+ per hole and rocky conditions pushing to $40 to $300+ per hole. Small jobs under 10 holes typically fall under the $500 to $1,500+ minimum callout rather than per-hole pricing. Oregon rates run at the higher end due to clay, wet-season conditions, and rocky soils east of the Cascades.
How long does it take to dig fence post holes? A 25-hole job in average soil takes about a half-day. A 50-hole job in average soil takes a full day. A 100-hole job in rural pasture soil takes 1.5 to 3 days. Rocky conditions roughly double those timelines. Hand-dug holes in rocky soil can take 30 to 60 minutes per hole.
What happens if the auger hits rock? Contractors handle rock in several ways: using a rock-capable auger bit, switching to a hammer attachment, hand-chiseling, or relocating the hole if possible. Expect an upcharge of $25 to $200+ per rocky hole depending on how much work it takes. Ask up front how your contractor handles rock so it's not a surprise line item.
How deep should fence post holes be in Oregon? Standard residential fence posts go 24 to 36 inches deep, or one-third the above-ground height of the post, whichever is more. Corner and gate posts go 36 to 48 inches. Coastal and wind-exposed locations may need 42 to 48 inches. Clay soil requires slightly deeper holes than sandy soil for equal stability.
Can I dig fence post holes myself? Fewer than 10 holes in easy soil is DIY-friendly with a rented two-person gas auger, budget $75 to $150+ per day for rental. Above that, or in rocky or heavy clay soil, the math usually favors hiring a contractor with proper hydraulic equipment. Call 811 before any digging, even DIY — state law requires it and unmarked utility strikes are your liability.
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