Short answer: clean fill dirt in the Denver metro is $15 per cubic yard delivered, with low-clay structural fill for drainage-critical applications at $25 per cubic yard — see our full Denver pricing guide for the complete tables. This guide covers what the pricing tables don't: why the Front Range's elevation change from the foothills to the eastern plains means two lots ten miles apart can need completely different fill, and how freeze-thaw drainage changes what grade counts as "good enough" here versus flatter, warmer climates.
Why Denver Needs a Terrain-Specific Fill Strategy
Most of DFW is flat enough that the same fill dirt behaves the same way anywhere in the metro. Denver isn't. The metro spans a real elevation and geology gradient — from rockier, better-draining ground near the foothills in the west to sandy high-plains soil in the east — and the Front Range's freeze-thaw cycle punishes water-retentive fill in a way Texas simply doesn't experience. A fill choice that's fine in Aurora's eastern plains can be the wrong call twenty minutes west in Lakewood.
Foothills vs. Plains Soil by Submarket
| Submarket | Native Soil | Grading Implication |
|---|---|---|
| Denver (city core) | Sandy loam and clay loam from ancient South Platte River deposits; rockier near the western foothills | Drainage generally moderate; verify grade closer to the foothills where rock content rises |
| Lakewood / Golden / western suburbs | Rockier, foothills-adjacent soil with faster natural drainage | Better native drainage, but rockier ground can still need structural fill for consistent compaction under a slab |
| Aurora (western half) | Heavy clay | Behaves like a Denver-core lot — treat as drainage-critical for anything load-bearing |
| Aurora (eastern half) / Parker / Brighton / eastern plains | Sandy prairie soil | Compacts well with moderate clay content; less drainage risk than the clay-heavy submarkets |
The practical takeaway: don't assume "Denver metro" pricing means "Denver metro" soil. If your lot sits anywhere from central Denver west toward the foothills, or in western Aurora, treat drainage as the deciding factor in material grade. If you're further east — Parker, Brighton, eastern Aurora — the native ground already drains reasonably well and the grade decision leans more on load requirements than moisture.
Frost Depth and Drainage-Critical Applications
The Front Range frost line typically runs 30 to 36 inches deep, well past what most of DFW ever has to design around. Water that gets trapped in high-clay fill and then freezes under a slab, driveway, or footing expands and heaves it — a failure mode that simply doesn't happen the same way in a warmer climate. That's why low-clay structural fill at $25/yd is not an upsell here the way it can read in a milder market: for anything load-bearing — foundations, driveway subbase, retaining wall backfill — it's the material that survives its third winter instead of the one that doesn't.
The Building Season Is Short
Practical working months along the Front Range run roughly April through October. Demand compresses hard into that window, and it's the reason booking material three to four weeks ahead in peak season is worth more than any per-yard discount you could negotiate. A known delivery schedule set in April prices and books more reliably than the same yardage needed on three days' notice in September.
Worked Example: Retaining Wall Backfill on a Sloped Front Range Lot
The project: a 40 ft long, 4 ft tall retaining wall on a sloped western Denver-suburb lot, needing engineered backfill behind the wall for drainage and load stability.
Step 1 — backfill volume. Backfill zone behind the wall: 40 ft long x 4 ft tall x 3 ft deep (standard backfill wedge) = 480 cubic feet, divided by 27 = 17.8 cubic yards.
Step 2 — compaction allowance. Structural backfill placed in engineered lifts loses about 10% of loose volume to compaction: 17.8 x 1.10 = 19.6 yards. Round to 20 yards — two tandem loads.
Step 3 — the bill.
| Line Item | Quantity | Rate | Cost |
|---|---|---|---|
| Structural fill (retaining wall backfill) | 20 cu yd | $25/yd | $500 |
| Delivery (2 loads) | — | Included | $0 |
| Total material delivered | 20 cu yd | — | $500 |
Not included: drainage pipe and gravel behind the wall (a separate, smaller material cost), geotextile fabric, and the wall construction itself. Retaining wall backfill is one of the applications where using cheaper clean fill instead of structural fill is a false economy — hydrostatic pressure from trapped, poorly-draining fill is a leading cause of retaining wall failure on the Front Range.
Get a Site Quote
Text us at (720) 577-5016 with your address, the project type, and roughly how many yards you think you need. We'll confirm which grade fits your specific submarket and drainage situation and quote a delivered price, usually within minutes during business hours.