A farm-tech company that picked the least glamorous problem on purpose
Somewhere in a row-crop field this spring, a robot the size of a small tractor is driving itself at 15 miles per hour, photographing the dirt four billion times an acre. It is looking for rocks. It is looking for weeds. It is doing the job that, for most of agricultural history, was handed to whoever was youngest, cheapest, or most out of favor.
That robot is called TerraScout, and the company behind it is TerraClear - headquartered in Issaquah, Washington, with a second home in Grangeville, Idaho. TerraClear does not sell a vision of farming. It sells the thing in the field. Today it counts roughly 1,000 customers and 52 employees, and it has spent the better part of a decade obsessed with a chore most technology companies would never touch.
The dullest job in farming turned out to be one of the hardest robotics problems in farming.
The TerraClear premise, in one lineRocks don't care how modern your tractor is
Every spring, fields heave up a fresh crop of stones. They snap blades, dent headers, and turn a $400,000 combine into an expensive paperweight. The traditional fix is a crew of people walking the field, bending over, and throwing rocks into a bucket. It is slow, it hurts, and nobody has ever enjoyed it.
Mechanical rock pickers existed, but they were blunt instruments - they churned the soil, missed the rocks that mattered, and grabbed the ones that didn't. The problem wasn't that nobody had tried. The problem was that picking rocks well requires knowing exactly where each one is, how big it is, and whether it's worth the trip. That is a perception problem before it is a machinery problem.
Solving the problem completely - by ensuring that you've gotten all the problematic rocks - is worth a lot to farmers.
TerraClearA software guy went home and got handed a bucket
Brent Frei had already built two technology companies - Onyx Software, and Smartsheet, which now trades on the NYSE. By any reasonable measure, he had earned the right to never pick a rock again. Then he went back to the family farm in Grangeville, Idaho, where rock picking had been a family ritual for 75 years, and his father handed him the job anyway.
Frei's bet, made in December 2017, was that the same machine vision and AI powering self-driving cars could be pointed at the ground instead of the road. Map the rocks with drones. Train neural networks to spot them. Build a precision robot to grab only the rocks, and leave the soil alone. The press nicknamed the long-term vision a "Roomba for rocks." Frei, who has since moved to Chairman while Devin Lammers took over as CEO in August 2024, was happy to let the nickname stick.
Our solution is holistic in that we use computer vision and AI to locate the rocks first. Then our robotic rock-picker, a precision tool, can be used to grab just the rocks without disturbing the soil.
TerraClearThree machines, one nervous system
TerraClear's stack reads like a relay race. A drone flies the field and Rock Map turns the imagery into a precise inventory of every problematic stone, viewable in a phone app. The Rock Picker - a precision implement that mounts to a skid steer or compact track loader - then clears 400 to 600 rocks an hour, hoisting boulders up to roughly 300 pounds without tearing up the ground.
In February 2026, the company closed the loop. TerraScout, its first fully autonomous robot, drives the field on its own, captures ultra-high-resolution imagery, and uses onboard edge compute to turn it into a "mission plan" it can hand to existing crews and equipment in real time. The same eyes that find rocks now find weeds too. The company calls the thing it solves the "action gap" - the space between knowing what's wrong with a field and actually doing something about it.
Rock Picker
Precision robotic implement that mounts to a skid steer or track loader and clears 400-600 rocks/hour, lifting up to ~300 lbs with minimal soil disturbance.
Rock Map
Drone-captured imagery run through neural networks to pinpoint the size and location of every problematic rock - delivered to a mobile app.
TerraScout
Self-driving field scout: 1,000+ acres/day at 15 mph, ~6 hours per refuel, 4B+ image samples per acre, real-time prescriptions on-board.
Weed Management
The same machine-vision stack, retrained - identifying and managing weeds across large-acre row crops.
Things that amuse and inform
- The founder's father picked rocks on the same farm for 75 years before a robot showed up.
- TerraScout captures more than 4 billion image samples per acre - then makes sense of them on the machine itself.
- Grabbing only the rock and leaving the soil untouched is, genuinely, one of the trickier robotics problems in the field.
- Before farm robots, Brent Frei co-founded Smartsheet (NYSE: SMAR).