Yarbo S1IIIConditionalCompare

Released 2023.10Reassessed 2026.09.20Compare

Yarbo S1

Name: Yarbo S1
Brand: Yarbo

Single platform mows, clears snow, and blows leaves on RTK-mapped zones without buried wire. Level III autonomy applies within each mode; the owner changes the module.

Superseded byYarbo Y40 Snow Blower

List price

$4,999

Retail price not tracked

Released 2023.10Reassessed 2026.09.20

Autonomy Ladder

Why Level III.

One five-rung scale, every category, from acting only on command to working unsupervised anywhere.

VGeneralized AutonomyAny task, any setting. No consumer robot has reached it.
IVEnvironmental AutonomyCopes with everyday clutter and frees itself, shown by independent testing.
To reach Level IVIndependent testing shows it avoids ordinary obstacles before contact, copes without the space being cleared, and frees itself when stuck.
IIIConditional AutonomyThis robot

Yarbo S1 finishes whole jobs in a space it already knows, and still needs a person at the edges.
What it does on its own
- Completes scheduled snow clearing with the two-stage snow blower within GPS-defined zones without perimeter wire (manufacturer documentation)
- Executes lawn mowing passes in systematic row pattern using RTK-grade GPS positioning (manufacturer specs)
- Leaf blower attachment runs scheduled clearing on programmed property zones (manufacturer documentation)
- Self-navigates around pre-mapped fixed obstacles using GPS and companion app boundary data
- Returns to charging station autonomously when battery drops below threshold (owner reports)
Why this level
- Yanko Design's owner report shows the Yarbo mowing a 5,700 sq ft yard unattended (T0), and PCWorld saw it detect a person and pause at a safe distance (T1).
- Yanko Design also reports it sometimes failed to detect smaller trees, attempted to move through and got stuck (T3 not met).
- No independent source shows it handling ordinary yard clutter without preparation (T2 unknown).
What holds it at Level III
- Manual module transitions: Mower, snow blower, and leaf blower changes are made by the owner; Yarbo states they are tool-free and take under two minutes, but there is no automated multi-mode sequencing.
- Owner-defined zones: Boundaries and no-go areas are drawn in the app before first run; the machine does not survey an unmapped property on its own (manufacturer app documentation).
- RTK-GNSS canopy sensitivity: Positioning accuracy degrades under dense tree cover, producing boundary drift in affected zones (owner reports).
- Weather-dependent reliability: Sub-freezing temperatures reduce battery runtime; heavy wet snow is reported to cause motor strain (owner reports).
- Single-zone operation per session: Multi-zone sequencing requires app scheduling across separate runs rather than continuous autonomous zone-to-zone transitions (manufacturer app documentation).
Autonomy dimension 78 / 100 · 6 independent sources reviewed, 7 from the maker
IIAssisted AutonomyRuns preset routines; stalls at anything new.
IManual AutomationOne action on command; no independent operation.

How we assign a level →

Behind the classification

Sources on file.

Verified6 independent sources reviewed, 7 from the maker

Five or more independent sources reviewed. The word says how much we read. It is not a grade.

Independent sources reviewed6

Press & video reviews1 source

Launch coverage from outdoor equipment and smart home publications following 2024 release.

This Snow-Plowing Robot Automates Yard Work While You …CNET

Independent teardown1 source

Independent teardown / regulatory internal-photo filings reviewed.

Product: Yarbo Snow Blower Model No: S1 Input: 36V 80A Maxfcc.report

Monitoring record4 sources

Sources behind the tracker entries following this robot.

From the maker, reviewed7

Manufacturer documentation3 sources

Yarbo S1 product specifications, attachment compatibility, app scheduling documentation.

Specification sources2 sources

Pages the published specifications were read from.

Monitoring record2 sources

Sources behind the tracker entries following this robot.

On file, not yet reviewedNot counted

Owner reports1 source

Owner forums and community reports on GPS drift, snow performance, attachment transitions.

Seeking Feedback on YARBO S1: Share Your Thoughts!Reddit · r/Yarbo

Firmware release notes3 sources

Yarbo app changelog covering navigation and scheduling updates post-launch.

Our own recordNot counted

Longitudinal signal2 sources

Robovations dated log for this robot: 6 tracked entries spanning ~35 months.

How we evaluate evidence →

Human Readiness

Known Issues.

One question: what does buying this robot today walk you into? The state is computed from the record, and recomputed daily.

Ready NowAssessed, with a clean record on file. A successor may be shipping; the page says so when it is.
New to MarketOn sale under 90 days; the ownership record is still forming.
WaitA successor is announced and has not shipped; re-read the decision when it arrives.
Known IssuesThis robot

Documented problems stand on the record of Yarbo S1. Read the case before buying.
How this was derived
- Documented setback on record: Researchers find hardcoded universal root password on every Yarbo S1 (Jul 2, 2026).
Notes on the record
- The Yarbo Snow Blower, meaning the Core plus the S1 module and its included accessories, sells direct and through retailers including Amazon, Lowe's, Walmart and Wellbots at $4,999.
- Setup requires zone mapping and module installation, manageable for mechanically comfortable owners.
- Manual module changes and 18-24 months of market data add provisional reliability context.
On the record
- Shipping since October 2023 · 37 months on the market
- Succeeded by Yarbo Y40 Snow Blower
- 6 independent sources reviewed, 7 from the maker
What would move it
The record resolving retires the call: a fix shipping, claims aligning with behavior, or independent reports converging.

How we assess readiness →

Robovations Score

How this number was reached

60of 100

CapableAt or above 24% of the 456 robots we score

DeficientLimitedCapableStrongExemplary

What moved itpoints gained or lost against a typical robot

Carried by

Edge-case recovery65+1.2
Consumables80+0.9

Held back by

Field failure rate46−3.8
Routine maintenance38−3.6
Coverage and navigation63−0.9

Capability40% of the score65What it does without you.

Task completion16% of the score68

Evidence

Freshly Charged ran the S1 through a record Denver snowstorm while one of the testers was away and found it cleared autonomously, but listed "Difficulty Docking" as a complaint when it headed back to the wireless charging station after a run, and the movement-pause feature malfunctioned once with a person standing beside it. It clears the driveway unattended, but the return leg does not close the loop reliably.

Coverage and navigation10% of the score63

Evidence

App-drawn virtual zones retained between runs with a systematic row pattern and pre-mapped fixed obstacles, no wire anywhere, on a rated 0.75 acre. Scored on the plan and its retention, not on the plus or minus 0.79 in figure. Deducted hard for the record's own headline finding: boundary drift under canopy or beside tall structures is documented across multiple owner forum threads as the most common operational issue on this platform, so the retained plan is not reliably held. Zones must also be drawn by hand, since the machine does not survey an unmapped property.

Edge-case recovery10% of the score65

Evidence

The perception stack is real and pre-contact: binocular camera plus ultrasonic radar plus bumper, with retailer sheets enumerating three cameras and seven ultrasonic radars. Low battery is handled outright, with the machine halting its pass, computing a return path and docking before critical. Every other documented mode ends with a person: signal loss stops it in place with a notification, motor overload halts it until someone clears the blockage, drift toward a boundary stops it for owner review, and an unseated attachment halts the run until reseated. Accurate reporting in all four, self-recovery in none.

Operating envelope4% of the score58

Evidence

Freshly Charged named "difficulty in removing wet, chunky snow" as a major downfall and noted the track design "doesn't work well with icy conditions," with stud accessories offered as the fix, while inclines and ordinary suburban lawn terrain were handled without trouble. Two common winter conditions degrade it, which sits below the single-documented-condition anchor.

Dependability40% of the score57Whether it keeps doing it.

Field failure rate16% of the score46

Evidence

About two years in market with 18 to 24 months of owner data and no confirmed recall, but four failure modes are documented and two of them stop the job under conditions the machine is bought for. Wet snow above its undocumented limit overloads the motor and shuts it down, and sub-20F refuses the scheduled run. Boundary drift is named as the most common operational issue across multiple owner threads. The evidence is genuinely independent, with owner forums plus linked CNET coverage, so these are observed rather than inferred, and the record itself calls the reliability picture provisional.

Software stability14% of the score65

Evidence

Updates ship on an app-connected platform and the record lists an annual firmware update review as an owner task, with no regression pattern reported across 18 to 24 months of owner data. The firmware source is described as an app changelog covering navigation and scheduling updates, but it is marked pending and its three links resolve to a wet-snow FAQ, a light-code troubleshooting page and an inspection guide rather than release notes. Updates ship and the record is silent in both directions, which is the ordinary anchor. The persistent drift complaint is an unfixed defect scored in failure_rate, not an update regression.

Support longevity10% of the score63

Evidence

Better positioned than a young direct-to-consumer brand usually is: real retail distribution through Amazon, Lowe's, Walmart and Wellbots alongside direct sales, a maintained support portal carrying a user manual, quick start guide, seasonal snow preparation guide and troubleshooting articles, and a modular architecture where the Core outlives any single attachment. Against it, roughly two years in market, no published support term, no parts-availability statement, no dealer service network, and no published price or interval for the auger and impeller wear parts.

Ownership burden20% of the score55What it asks of you.

Routine maintenance12% of the score38

Evidence

A heavy burden, and the top item cuts against the whole premise: packed snow and debris must be cleared from the auger housing and chute after every use with the machine powered down, plus a module drive inspection, so someone goes outside after every snowfall anyway. Around that: weekly deck cleaning in mowing season, monthly antenna housing moisture checks and dock contact cleaning, seasonal auger and impeller wear inspection, and an annual battery and module inspection. Module changes and seasonal storage are two-person tasks at 77 pounds for the module on a 134 pound machine.

Consumables8% of the score80

Evidence

As sold with the S1 module the recurring list is short: auger and impeller wear through the snow season, and the 1,382 Wh pack over service life. No subscription, no correction fee, and no reference station to rent because the Data Center ships in the box. Held below the top because neither wear item carries a published interval or a published price, so the running cost cannot be bounded before purchase, and the pack is large enough that its eventual replacement is a real number.

middle half of the databaseits medianthis robot

Reported, not scoredneither measures how well the robot works

Five-year cost$6,000

Upper third and understated as a platform figure. 4,999 dollars for the Core plus the S1 snow blower module as sold, plus an allowance of about 200 dollars for auger and impeller wear across five snow seasons, which is an estimate because Yarbo publishes neither an interval nor a price, and one replacement 1,382 Wh pack. No subscription and no correction fee. The multi-function premise the platform is sold on is not in this number: the mower and leaf blower modules are separate purchases, and the record's own con states the arithmetic only works across two or more modules.

Data postureCloud-linked

Account required. Maps and telemetry leave the home; core function survives an outage.

What leaves the homeDocumented

The Yarbo companion app collects property GPS zone data, scheduling preferences, and operational session logs. Navigation and mapping data is processed via cloud infrastructure for scheduling and remote monitoring functions. No documented third-party data sharing or advertising data practices identified in available policy coverage; privacy policy detail remains incompletely reviewed at this evaluation date.

On-device processingNo

Read the full methodology →

FIT CHECK

Will the Yarbo S1 fit your setup?

Describe your setup using the controls. Each choice reads the spec sheet for you, flagging where the Yarbo S1 is built for your space and where it isn’t.

Area to clear or mow

Terrain

Jobs you need done

Grass type

A classification of fit for the conditions you set, not a recommendation. Verdicts describe engineering design intent, not test results.

OWNERSHIP

Living with it.

Functional but provisional; GPS drift under canopy and motor strain in heavy snow documented.

Stableowner-reported arc

The record so far

Owner forums report consistent boundary-drift failures in tree-cover zones and snow-motor overload in wet-snow conditions. 18-24 months of field data shows no critical failures but coverage remains early.

What goes wrong4 documented · 1 self-recover

Occasional

GPS boundary drift under canopyUnit leaves mapped zone, requires manual repositioning

Owner fixManual restart after moving to open area

Occasional

Motor cuts out, automatic halt with error code

Owner fixClear blockage and manually restart operation

Occasional

Scheduled job does not begin until thermal warmup

Self-recoversAllow unit to warm before next scheduled run

Rare

Attachment seating failureError code, scheduled run halts mid-task

Owner fixReseat attachment and resume job

Upkeep routine

Each useEvery cycle

Clear packed snow and debris from the auger housing and chute, or from the mower deck, with the machine powered down; inspect module drive components.

Weekly52×/yr

Clean mower deck underside; check condition for nicks.

Monthly12×/yr

Inspect -GNSS antenna housings for moisture; clean charging contacts on the docking station.

Seasonal4×/yr

Sharpen or replace mower ($15-$30); inspect the auger and impeller for wear through the snow season.

Yearly1×/yr

Battery capacity check; full module inspection before seasonal transition; firmware update review.

Cost over timeabout $144 past the sticker over three years

PurchaseRunning cost

Year 1

$5,047

Year 3

$5,143

Year 5

$5,239

$4,999 to buy, then about $48 a year for the replaceable parts below. Over three years that is roughly $144 past the sticker price. Excludes electricity and any repairs.

What you replace

Every 3-6 months$15–30

Replacement cadence from the maintenance schedule; prices shown where the source documents them.

Safety notes1 caution · 2 notes

CautionRotary mower blade requires clear zoneNo dynamic obstacle detection; people and pets must be cleared before scheduled operation begins.
Fixed snow discharge directionDischarge angle cannot be redirected; confirm setup avoids walkways, vehicles, and structures.
55-pound unit requires two-person handlingSeasonal storage and attachment loading need assistance per safety documentation.

SPECIFICATION

The full spec sheet.

Priced below the category median, with every figure charted against the category below.

Dimensional drawing

Key specificationsManufacturer-publishedSources: Manufacturer site

FootprintThe width, depth and height of the robot itself, without its dock.: 27.6 × 35.4 in, 14.2 in tall
WeightThe robot alone, without its dock, as the maker states it.: 134 lbs
BatteryStored energy in watt-hours; a larger pack runs longer, not harder.: 1,382 Wh · Li-ion
Wi-FiThe bands the robot can join; many models need a 2.4 GHz network to set up.: Supported
Cutting width: 20 in•
Cutting height range: 1.2-4 in•
Max slope: 70%•
Blade system: Floating deck, two discs of five blades•
Boundary method: Wire-free, dual-antenna RTK-GNSS
Max area: 32,700 sq ft
Drive layout: Tracked drive system•

Where it lands · position among 5 yard robotsThis robotMedianTypical range

RuntimeThe maker's stated running time on one charge, at a standard setting.240min

90 min240 min

Top of range

PriceThe maker's list price, not a price found in a shop.$4,999

$4,999$7,799

Bottom of range

NoiseLoudness at the maker's stated distance, in decibels; ten more decibels reads as about twice as loud.82dB

58 dB82 dB

Top of range

Charge timeTime from empty to full on the dock, as the maker states it.180min

60 min180 min

Top of range

WeightThe robot alone, without its dock, as the maker states it.134lbs

88 lbs228.2 lbs

Near median

Position shows where the figure sits across the tracked category, not a quality judgment.

Official referencesManufacturer site

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon

Just launched

Active updates

Settled

Discontinued

Sep 2026 · AnnouncementYarbo names the Y40 Snow Blower as the S1’s successor
Sep 2026 · AssessmentReadiness reassessed: Ready Now → Known Issues
Sep 2026 · AssessmentAutonomy Ladder reclassified IV → III
Aug 2026 · AssessmentRobovations Score rescored under v4.2: 71 → 60
Aug 2026 · AssessmentReadiness reassessed: Promising Progress → Ready Now
Jul 2026 · AssessmentRobovations Score recorded at 71 of 100
Jul 2026 · AssessmentRecord status: Provisional → Verified
Jul 2026 · NewsResearchers find hardcoded universal root password on every Yarbo S1

Show 4 earlier entriesHide earlier entries

Jun 2026 · NewsUS advisory discloses critical Yarbo mobile app credential flaw, fix already issued
Feb 2025 · NewsFirst winter season owner reports document Yarbo S1 GPS drift and snow limits
Jan 2024 · DemoModular yard robot platform demoed at CES 2024
Nov 2023 · ReleaseReaches commercial retail availability in North America

Questions

What people actually ask.

7 answered

OperationDoes the Yarbo S1 automatically switch between mower, snow blower, and leaf blower?

No. Yarbo states module changes are tool-free and take under two minutes, but the owner makes them. The robot operates each mode autonomously once the module is installed.

OperationWhat positioning does the S1 use? Does it need a separate RTK base station?

Dual-antenna RTK-GNSS is standard, rated at plus or minus 0.79 in. The reference station Yarbo calls the Data Center ships in the box alongside the Core, the module, the docking station, battery, controller, and tow hitch. There is no non-RTK configuration and no separate purchase.

OperationHow much snow can the Yarbo S1 clear in a single pass?

The S1 is a two-stage snow blower with a 24 in clearing width and a 12 in intake height, discharging 6 to 40 feet on an adjustable chute. Owner reports describe reduced performance in wet or compacted snow; Yarbo publishes no wet-snow rating.

OperationWhat lot size is the S1 designed for?

Manufacturer documentation indicates coverage up to approximately 0.75 acres per charge for mowing. Snow clearing coverage per charge is typically lower due to motor load.

OperationIs perimeter wire required?

No. The S1 uses RTK-GNSS virtual boundaries defined in the companion app. That removes the wire-laying step on established properties, though positioning quality still varies in wooded or obstructed yards.

OperationDoes the Yarbo S1 detect pets and children?

The Core carries an obstacle-detection stack. Yarbo describes it as binocular camera plus ultrasonic radar plus bumper; retailer spec sheets enumerate three cameras and seven ultrasonic radars with AI obstacle detection. Detection is a mitigation rather than a guard: the mower deck carries rotary blades and the S1 an auger intake, so clear the work zone of people and pets before a scheduled run.

OperationWhat happens in sub-freezing temperatures?

Owner reports document reduced battery runtime below 20°F, with reduced motor responsiveness in heavy wet snow. The S1 module is the primary cold-weather use case; Yarbo recommends storing above freezing when not in active operation.

Cite & Embed

Reference the Yarbo S1 classification.

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Citation

Robovations. "Yarbo S1: Autonomy Level III (Conditional Autonomy)." Autonomy Ladder™, assessed September 2026. https://robovations.com/robots/yarbo-s1/

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Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the Yarbo S1 and Yarbo M20i side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with Yarbo Y40 Snow Blower, Yarbo Y40P Core Snow Blower, Yarbo M20.

For browsers

See every Level III.

Every robot we’ve classified at conditional autonomy. Sorted by readiness, score, and price. Filter by category, manufacturer, or release date.

Browse every Level III robot

Updated weekly with new entries and reclassifications.

Yarbo S1

Will the Yarbo S1 fit your setup?

Living with it.

The full spec sheet.

How the assessment has moved.

What people actually ask.

Other multi-task robots we have classified.

Yarbo Y40 Snow Blower

Yarbo Y40P Core Snow Blower

Yarbo M20

Yarbo M20i

Reference the Yarbo S1 classification.

Three ways to keep going.

Get the next reassessment.

Compare with a peer.

See every Level III.