We have delivered fill dirt and topsoil to hundreds of raised bed projects across DFW and Denver. The single biggest mistake we see is homeowners filling an entire 24-inch raised bed with $30-per-yard premium garden soil. That is a fast way to spend $500 on a 4x8 bed. The smarter approach is layering: affordable fill dirt on the bottom, quality topsoil on top. Your plants cannot tell the difference 12 inches down, and your wallet will thank you.
The Layered Approach: How to Fill a Raised Bed Properly
Every raised garden bed needs two zones. The bottom zone handles drainage and structure. The top zone feeds your plants. Here is the breakdown:
Bottom layer (lower 50-60% of bed depth): Clean fill dirt. This provides volume, drainage, and a stable base. In DFW, our fill dirt runs $10 per yard delivered. In Denver, $15 per yard. Compare that to premium garden soil at $30 to $45 per yard from a garden center, and the savings add up fast.
Top layer (upper 8-12 inches): Quality topsoil blended with compost. Our topsoil is $17 per yard in DFW and $22 per yard in Denver. Mix it roughly 70/30 with compost and you have a growing medium that matches anything sold in bags at three times the price.
Between the two layers, some growers lay landscape fabric to slow soil migration. We have seen beds perform fine without it, but if your fill dirt has more clay content, the fabric helps keep your topsoil layer from compacting over time.
Bed Depth Recommendations
Not every crop needs the same depth. Here is what actually works based on root systems:
12 inches total depth: Lettuce, herbs, strawberries, peppers, and most annual flowers. Use 4-6 inches of fill dirt on the bottom, 6-8 inches of topsoil/compost on top.
18 inches total depth: Tomatoes, squash, cucumbers, and beans. Use 8-10 inches of fill dirt, 8-10 inches of topsoil/compost.
24 inches total depth: Carrots, potatoes, parsnips, and other deep root crops. Use 12-14 inches of fill dirt, 10-12 inches of topsoil/compost. This depth also works well if you are building beds over concrete patios or heavily compacted DFW clay.
Calculating How Much Material You Need
The formula is simple: Length (ft) x Width (ft) x Depth (ft) / 27 = cubic yards. A standard 4x8 bed that is 18 inches deep needs 4 x 8 x 1.5 / 27 = 1.78 cubic yards total. Round up to 2 yards. For that bed, you would order about 1 yard of fill dirt and 1 yard of topsoil.
Building multiple beds makes bulk delivery worthwhile. Four 4x8 beds at 18 inches deep require roughly 8 yards of material total. Our minimum order is 10 yards, and a tandem truck carries exactly that. You can split the load: 5 yards of fill dirt at $10/yd and order topsoil separately, or ask us to coordinate both deliveries on the same day. Use our calculator at filldirtnearme.net/calculator to dial in exact quantities.
The Hugelkultur Option
For beds 24 inches or deeper, Hugelkultur is worth considering. Place logs, thick branches, and untreated wood scraps at the very bottom of the bed, filling the lowest 6-10 inches. Then add fill dirt around and over the wood, then topsoil on top. As the wood decomposes over 2-5 years, it acts like a sponge, retaining moisture and slowly releasing nutrients. In Denver, where summer watering costs add up fast, this method can cut irrigation needs by 20-30%. In DFW, it helps buffer against the brutal July and August heat that dries out beds in 24 hours.
One warning: use hardwood, not pine or cedar. Softwoods decompose too quickly and temporarily rob nitrogen from the soil as they break down.
Filling Technique: Do Not Rush This Part
Dumping all your material in at once and planting the same day is a recipe for settling problems. Here is the right sequence:
Step 1: Add your fill dirt layer. Rake it roughly level. Water it thoroughly with a garden hose until you see standing water momentarily. This eliminates air pockets.
Step 2: Wait 24-48 hours. The fill will settle 1-2 inches. Top it off if needed.
Step 3: Add your topsoil/compost layer. Rake level. Water again, gently this time so you do not erode channels in your planting soil.
Step 4: Wait another 24 hours before planting. Expect the entire bed to settle an additional 1-2 inches over the first month. Keep extra topsoil on hand to top off as needed.
Order 10-15% more material than your calculations suggest. Settling is unavoidable, and having a small pile left over is far better than a bed that sinks below the frame after the first hard rain.
What NOT to Put in Your Raised Bed
Construction debris: Broken concrete, drywall scraps, and demolition waste have no place in a garden bed. Drywall leaches sulfur compounds. Concrete raises pH to levels that lock out nutrients. We have seen people try this to save money. It does not work.
Contaminated fill: Any fill dirt from an unknown source could contain heavy metals, petroleum residue, or herbicide-treated soil. Always know where your fill comes from. Our fill dirt is sourced from verified excavation sites across DFW and Denver.
High-clay fill without drainage: DFW native soil is notorious for its black clay. Pure clay fill in a raised bed with no bottom drainage creates a bathtub effect where water pools at the root zone and rots plants. If your bed sits on ground level, leave the bottom open to the native soil below. If it sits on a hard surface like a patio, drill drainage holes or line the bottom 2 inches with gravel before adding fill dirt.
Seasonal Timing: When to Build and Fill
DFW (North Texas): Build and fill beds in February or early March. This gives the soil 4-6 weeks to settle before spring planting season kicks off in mid-March through April. Fall beds should be filled by late September for October planting of cool-season crops. Avoid filling beds in July and August when temperatures above 100 degrees bake exposed soil into a hard crust before you can plant.
Denver metro: Your window is tighter. Fill beds in late April or early May after the last hard freeze, which typically hits around May 5-10. The freeze-thaw cycles of a Colorado winter will actually help settle fill dirt naturally, so beds built in October and left to overwinter are ready to plant by spring with minimal additional topping off. Just do not leave topsoil exposed over winter without mulch cover, or spring snowmelt will wash away your investment.
The Cost Comparison That Matters
Here is the real math on a common project: four 4x8 raised beds, each 18 inches deep. That is roughly 8 cubic yards of material.
Option A (all premium garden soil): 8 yards at $35/yd average = $280 in material alone, plus individual delivery fees that can add $50-100 per trip. Total: $330-$380.
Option B (layered approach with our delivery): 4 yards of fill dirt at $10/yd = $40. 4 yards of topsoil at $17/yd = $68. Total: $108, delivery included, no hidden fees.
That is a savings of over $220 on the same project. Same tomatoes. Same peppers. Same harvest.
We deliver fill dirt and topsoil across 80+ cities in DFW and 14+ cities in the Denver metro area. Minimum order is 10 yards. Same-day delivery is available on orders placed before 10 AM. Text us at (469) 523-6420 or email support@filldirtnearme.net to get your raised bed project scheduled. We are available Monday through Saturday, 7 AM to 5 PM. Payment accepted via Zelle or Venmo.