With a bucket: almost nothing below the surface it's standing on.
With an auger, trencher, or backhoe attachment: several feet, depending on the attachment.
The machine itself doesn't have a digging depth. It's a loader, and a loader scoops at ground level. Depth comes entirely from the attachment.
Why a Bucket Barely Digs
A loader bucket works by pushing forward and curling. It can scrape, skim, and excavate a shallow area by driving into it, but it can't reach below the plane the machine sits on — the tracks are in the way.
You can excavate a shallow area by working a ramp down into it, and people do for small features. It's slow and it isn't what the machine is for.
If you need depth, you need an attachment or a different machine.
Depth by Attachment
Auger — the deepest practical option for point excavations. Bit length plus extensions determines depth, and typical setups reach frost depth for footings and posts in most regions. Narrow holes only.
Trencher — cuts to the boom's rated depth in a continuous line. Common configurations in this class run into the several-foot range. Narrow trenches.
Backhoe attachment — genuine below-grade digging with a bucket. Depth per the attachment's rating. Slower and less capable than a mini excavator, with limited swing and no slew.
Vibratory plow — pulls pipe or cable to the blade's depth without an open trench. Shallow relative to a trencher.
Rock saw — cuts to the wheel's rated depth in hard material.
Check each attachment's published depth against your requirement — and against your local code, since frost depth and burial depth requirements vary substantially by region.
When You Need a Different Machine
Continuous strip footings — excavator or backhoe. A loader can't trench a foundation perimeter efficiently.
Foundation and basement excavation — excavator.
Ponds and large excavations — excavator, and usually a big one.
Deep utility work — excavator, plus trench protection at depth.
Septic tank excavation — excavator.
We'd rather tell you that than sell you a machine that struggles with the job.
Trench Safety at Depth
Worth stating plainly, because it kills people every year.
OSHA requires a protective system — shoring, shielding, or sloping — for excavations 5 feet deep or greater. Soil collapses without warning, and a cubic yard of soil weighs enough to be immediately fatal.
Never enter an unprotected trench at that depth, and be aware that collapse risk exists at shallower depths in unstable soil too.
Also: call 811 before any digging, regardless of depth or attachment.
FAQ
How deep can an auger drill?
Bit length plus extensions. Confirm the specific configuration reaches your frost depth requirement.
How deep can a trencher go?
Set by the boom configuration. Check the attachment spec against your burial depth code.
Can it dig a basement?
No. That's excavator work.
Can it dig a footing?
Pier and post footings with an auger, yes. Continuous strip footings, no. See can a mini skid steer dig a footing.
What about a pond?
No. See can a mini skid steer dig a pond.
Is a backhoe attachment worth it?
If you dig occasionally and already own the loader, it saves rental trips. If you dig regularly, buy or rent a mini excavator — it's faster and more capable.
Can it dig below its own tracks with a bucket?
Barely, and inefficiently. Not what the machine is designed for.
How does this compare to a mini excavator?
An excavator has reach, slew, and real digging depth. A loader has carrying capacity and speed on the surface. Genuinely different tools. Mini Skid Steer vs. Mini Excavator →