Ryobi ZR3 80V HP Brushless 42" Zero Turn Riding Mower Kit
Zero-Turn mower · Model RY80HPRM04K-ZR3 · Residential-duty · Battery
$3,999 Ryobi list price
Manufacturer list price only — it excludes tax, freight, dealer setup and any local discount, and dealers set the final price.
- Mows an acre in 36 min (25 at top speed) How long for your yard? ›
- How these are worked out ›
The Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit is a residential-grade battery zero-turn mower, built for mowing open residential acreage quickly, with a 42-inch deck and a 80 V battery.
Also sold as: ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit (Kit (battery & charger included))
At a glance
Compare similar mowers See how this mower compares with machines of a similar size and purpose.
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
| Power Source | battery |
|---|---|
| Fuel Type | Battery / Electric |
Electrical
| Voltage | 80 V |
|---|
Deck
| Cutting Width | 42 in (1067 mm) |
|---|---|
| Min Cut Height | 1 in (25 mm) |
| Max Cut Height | 4.5 in (114 mm) |
| Deck Material | 12G Fabricated Steel |
| Deck Gauge | 12 |
| Discharge | Mulching, Bagging & Side Discharge |
Drive
| Ground Speed | 7 mph |
|---|---|
| Drive Type | Riding |
General
| Warranty | 5 yr |
|---|
Productivity & acreage
ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit deck width, ground speed and computed acres-per-hour, from the specs we have. Duty class: Residential — Built for home-lawn use.
Productivity computed from deck width and ground speed. Compare on the calculator ›
| Deck width | 42 in |
|---|---|
| Drive type | Riding |
| Ground speed | 7 mph |
| Cut-height range | 25 mm – 114 mm |
| Warranty | 5 |
| Deck construction | 12G Fabricated Steel |
| Deck gauge | 12 ga |
Ryobi doesn’t publish 12 of these for the ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit: engine make, engine displacement, engine power, transmission, fuel capacity, weight, commercial warranty, spindle type, frame construction, anti-scalp rollers, drive tire size, seat type.
Similar models
Other zero-turn mowers with comparable specs — including other brands — that buyers cross-shop with the ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit.
Specs verified against the manufacturer spec sheet on Jun 6, 2026 — ryobitools.com.
What the parts on this spec sheet mean
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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 Ryobi’s own numbers — not published by the manufacturer.
Mowing time
- ¼ acre9 min 6 min
- ½ acre18 min 13 min
- 1 acre36 min 25 min
- 2 acres1 h 12 min 51 min
- 5 acres3 h 2 h 6 min
About 36 min per acre at 1.66 acres/hour, mowing at 4.9 mph. The second figure is at the published 7.0 mph top speed (2.38 acres/hour) — faster than anyone really mows.
Gate & trailer fit
- 32 in gateToo wide
- 36 in gateToo wide
- 48 in gateToo wide
Needs at least 49 in of clearance (estimated).
Mowing times assume 1.66 acres/hour: deck width x 4.9 mph at 80% efficiency, which allows for overlap, turns and trimming. 4.9 mph is 70% of the 7.0 mph top speed Ryobi publishes - almost nobody mows flat out. The "at top speed" figure is the same sum at 7.0 mph, shown so you can see it.
Fit uses the deck width plus 6 in for the discharge chute, because Ryobi doesn't publish an overall width — measure before buying if a gate is tight.
Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit questions
What size deck is on the Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit?
The Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit has a 42-inch (1067 mm) cutting deck with 12g fabricated steel construction.
How fast is the Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit?
Top ground speed is 7 mph. With its 42-inch deck that works out to about 2.38 acres per hour at 80% efficiency — allowing for overlap, turns and trimming.
How long does the Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit take to mow an acre?
About 25 min per acre, from its 42-inch deck at 7 mph and 80% efficiency — roughly 2.38 acres an hour, so five acres is about 2 h 6 min. Rough or obstacle-heavy ground takes longer; this is deck width times ground speed, not a timed test.
How much does the Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit cost?
Ryobi's published list price is $3,999, checked 22 October 2026. That excludes tax, freight, dealer setup and any local discount — dealers set the final price.
What is the Ryobi ZR3 80V HP Brushless 42 in Zero Turn Riding Mower Kit built for?
Residential-duty zero-turn mower. Built for home-lawn use.
Source: Ryobi (manufacturer) · archived copy