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John Deere S120 Lawn Tractor

Riding (Lawn Tractor) mower · Model S120 · Prosumer-duty · Gas

John Deere Australia doesn’t publish a recommended retail price for this model online — it’s dealer quote only. The John Deere Australia product page is the place to start.

Sold in Australia — listed on deere.com.au, checked 20 Oct 2026. Listed there as S120 (S120). Also sold in the United States: US specs and list price.

The John Deere S120 Lawn Tractor is a prosumer-grade gas lawn tractor, built for large residential properties and acreage, with a 42-inch deck and a 724.3cc engine making 22 hp. It weighs 444 lb (201.4 kg).

At a glance

Power Source
gas
Cutting Width
42 in (1067 mm)
Displacement
44.2 ci (724.3 cc)
Engine Power
22 hp
Transmission
Hydrostatic, 2-wheel drive
Weight
444 lbs (201.4 kg)
Compare similar mowers See how this mower compares with machines of a similar size and purpose.
  • Deck 1,067 mm (42 in) · Briggs & Stratton EXi Series V-Twin, 20 hp, 656 cc · RRP A$5,249
    Fuel capacity 7.5 L (2 gal) (this model: 9.1 L (2.4 gal))Max cut height 85 mm (3.3 in) (this model: 102 mm (4 in))
    Why: Same class: riding (lawn tractor) · Same 42 in deck · Gas engine, like this model · Prosumer-duty, like this model · 20 hp (this model: 22 hp) · By Victa, a different maker
    Compare with the S120 Lawn Tractor ›
  • Deck 1,067 mm (42 in) · Kawasaki GH739V-3, 21.5 hp, 726 cc
    Fuel capacity 13.6 L (3.6 gal) (this model: 9.1 L (2.4 gal))Weight 282 kg (622 lbs) (this model: 201.4 kg (444 lbs))
    Why: Same class: riding (lawn tractor) · Same 42 in deck · Gas engine, like this model · Prosumer-duty, like this model · 21.5 hp (this model: 22 hp) · By Kubota, a different maker
    Compare with the S120 Lawn Tractor ›
  • Deck 1,067 mm (42 in) · Briggs & Stratton EX Series OHV, 17.5 hp, 500 cc · RRP A$4,799
    Displacement 500 cc (30.5 ci) (this model: 724.3 cc (44.2 ci))Engine power 17.5 hp (this model: 22 hp)
    Why: Same class: riding (lawn tractor) · Same 42 in deck · Gas engine, like this model · Prosumer-duty, like this model · 17.5 hp (this model: 22 hp) · By Victa, a different maker
    Compare with the S120 Lawn Tractor ›
  • Deck 1,067 mm (42 in) · 22 hp, 724 cc
    Why: Same class: riding (lawn tractor) · Same 42 in deck · Gas engine, like this model · Prosumer-duty, like this model · 22 hp (this model: 22 hp) · Also by John Deere
    Compare with the S120 Lawn Tractor ›
  • Deck 1,080 mm (42.5 in) · Husqvarna HV 708AE, 24.5 hp, 708 cc · RRP A$8,999
    Ground speed 6.2 mph (this model: 5.5 mph)Engine power 24.5 hp (this model: 22 hp)
    Why: Same class: riding (lawn tractor) · 42.5 in deck, within 6 in of this model's 42 in · Gas engine, like this model · Prosumer-duty, like this model · 24.5 hp (this model: 22 hp) · By Husqvarna, a different maker
    Compare with the S120 Lawn Tractor ›

Chosen by stated rules, not opinion: same class, a deck within 6 in of this one, the same kind of power and a compatible duty class, then the closest power, weight and price, with other makers preferred. Figures are the manufacturers’ published ones; nothing is estimated.

Engine

John Deere S120 Lawn Tractor engine specifications
Power Sourcegas
Displacement44.2 ci (724.3 cc)
Engine Power22 hp
Cylinders2
Engine Model44N677 (M44)
Fuel TypeGasoline

Deck

John Deere S120 Lawn Tractor deck specifications
Cutting Width42 in (1067 mm)
Min Cut Height1 in (25 mm)
Max Cut Height4 in (102 mm)
Deck MaterialSteel, 13 gauge0.090 in.2.3 mm
Deck ConstructionStamped steel deck shell
Deck Gauge13
DischargeSide discharge

Drive

John Deere S120 Lawn Tractor drive specifications
TransmissionHydrostatic, 2-wheel drive
Ground Speed5.5 mph
Drive Tire Size20x8-8
Drive SystemManual power take-off (PTO)
Reverse Speed3.2 mph

Dimensions

John Deere S120 Lawn Tractor dimensions specifications
Weight444 lbs (201.4 kg)
Fuel Capacity2.4 gal (9.1 L)
Length69.7 in (1770 mm)
Width55.2 in (1402 mm)
Height44 in (1118 mm)

Commercial / Pro

John Deere S120 Lawn Tractor commercial / pro specifications
Frame ConstructionFull-length welded steel
Seat TypeTwo-piece with open-back

General

John Deere S120 Lawn Tractor general specifications
Bagger Capacity6.5 bu (229 L)
Warranty2 yr

Similar models

Other riding (lawn tractor) mowers with comparable specs — including other brands — that buyers cross-shop with the S120 Lawn Tractor.

Specs verified against the manufacturer spec sheet on Jun 6, 2026 — deere.com.

Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.

What the specs work out to

Figures MowerFacts computes from John Deere’s own numbers — not published by the manufacturer.

Mowing time

  • ¼ acre11 min 8 min
  • ½ acre23 min 16 min
  • 1 acre46 min 32 min
  • 2 acres1 h 32 min 1 h 4 min
  • 5 acres3 h 50 min 2 h 41 min

About 46 min per acre at 1.31 acres/hour, mowing at 3.8 mph. The second figure is at the published 5.5 mph top speed (1.87 acres/hour) — faster than anyone really mows. About 3.1 acres per tank.

Weight & hauling

  • Machine weight444 lb
  • + 6×12 trailer900 lb
  • Towed weight1,344 lb
  • single-axle 3,500 lbCarries it, 2,156 lb spare
  • tandem-axle 7,000 lbCarries it, 5,656 lb spare

Needs a single-axle 3,500 lb trailer and a vehicle rated to tow at least 1,344 lb.

Gate & trailer fit

  • 32 in gateToo wide
  • 36 in gateToo wide
  • 48 in gateToo wide

Needs at least 56 in of clearance.

Power & run time

  • Power per deck inch0.524 hp/in
  • Run time per tank~2.4 h

Mowing times assume 1.31 acres/hour: deck width x 3.8 mph at 80% efficiency, which allows for overlap, turns and trimming. 3.8 mph is 70% of the 5.5 mph top speed John Deere publishes - almost nobody mows flat out. The "at top speed" figure is the same sum at 5.5 mph, shown so you can see it.

Fit uses John Deere's published overall width.

Towed weight adds a 900 lb allowance for a 6x12 open utility trailer to John Deere's published machine weight. Your trailer's own weight is on its VIN plate. Tongue weight, axle placement and your vehicle's tow rating are still yours to check — this is the load, not a loading plan.

Run time assumes a typical 1 gal/hour burn at working load; real consumption varies with engine, load and cut.

Source: John Deere (manufacturer) · archived copy

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