Monterey 258 SS 2019 boat specs
Monterey
Monterey 258 SS 2019
2019
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VS
Monterey M4 2020 boat specs
Monterey
Monterey M4 2020
2020
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Monterey 258 SS 2019 vs Monterey M4 2020 — Same Brand, Different Boat

The Monterey 258 SS 2019 vs Monterey M4 2020 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.

On paper these two are close siblings in the size department — Monterey 258 SS 2019 at 25,1 ft versus Monterey M4 2020 at 23,1 ft. Weight tells a clearer story for trailering families: the Monterey 258 SS 2019 tips the scales at 5 100 lbs — 600 lbs more than the Monterey M4 2020 at 4 500 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

The power gap is worth calling out. Rated to 430 hp, the Monterey 258 SS 2019 has a 130-hp advantage over the Monterey M4 2020's 300-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Monterey 258 SS 2019 carries 65 gallons versus 5 gallons in the Monterey M4 2020. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 7 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.

Bottom line: Performance buyers should lean toward the Monterey 258 SS 2019 and its 430-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Monterey M4 2020 with its 300-hp rating is the more economical daily driver.
Measurements / Dimensions
Length overall - Detail25.10 ft
Length overall - Detail23.10 ft
Length - Feet25.1
Length - Feet23.1
Length overall - Meters7.65
Length overall - Meters7.04
Length overall - Inches301
Length overall - Inches277
Beam8.60 ft
Beam8.60 ft
Beam - Meters2.62
Beam - Meters2.62
Beam - Inches103
Beam - Inches103
Draft [max] - Detail3.70 ft
Draft [max] - Detail3.60 ft
Draft [max] - Meters1.13
Draft [max] - Meters1.1
Draft [max] - Inches44
Draft [max] - Inches43
Draft Min2.40 ft
Draft Min2.20 ft
Displacement5100.00 lbs
Displacement4500.00 lbs
Engine and Drivetrain
Fuel tank capacity - Gal65
Fuel tank capacity - Gal5
Fuel tank capacity - Liters246.05
Fuel tank capacity - Liters189.27
Engine makeMercury
Engine makenot available
Horsepower430 hp
Horsepower300 hp
Drive typeinboard
Drive typeinboard
Engine 2 Engine Makenot available
Engine 2 Engine MakeVOLVO PENTA
Engine 2 Horsepowernot available
Engine 2 Horsepower380 hp
Engine 2 Drive Typenot available
Engine 2 Drive Typeinboard
Operational Info
Head1
Head1
Water capacity1
Water capacity1
Holding tank capacity - Gal11
Holding tank capacity - Galnot available
Holding tank capacity - Liters41.64
Holding tank capacity - Litersnot available
Boat typePower
Boat typePower

Monterey 258 SS 2019 vs Monterey M4 2020 — Common Questions

Which is the larger boat — the Monterey 258 SS 2019 or the Monterey M4 2020?
The Monterey 258 SS 2019 is the longer of the two at 25,1 feet overall. The Monterey M4 2020 comes in at 23,1 feet, making it roughly 2,0 ft shorter — a meaningful difference in deck room and overall on-water presence.
Which is easier to trailer — the Monterey 258 SS 2019 or the Monterey M4 2020?
For trailering, the Monterey M4 2020 has the edge at 4 500 lbs dry weight versus 5 100 lbs for the Monterey 258 SS 2019. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.
Which boat can handle a bigger outboard?
The Monterey 258 SS 2019 is rated to a maximum of 430 hp, giving it the larger power ceiling. The Monterey M4 2020 tops out at 300 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.
How many people can each boat hold?
The Monterey 258 SS 2019 is Coast Guard rated for 7 passengers, while the Monterey M4 2020 is certified for 7. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.
Do these boats require an oversize trailer permit to tow on US highways?
Both the Monterey 258 SS 2019 and Monterey M4 2020 share an 8.60 ft beam — meaning both sit right at the 8’6" threshold that most US states use for standard-width loads. In most states you can tow at that width without a special permit, but regulations vary. Always check the rules for your state and any states you'll be passing through before your first long haul.
Which boat has the larger fuel tank — the Monterey 258 SS 2019 or the Monterey M4 2020?
The Monterey 258 SS 2019 has the bigger tank at 65 gallons, versus 5 gallons on the Monterey M4 2020. That 60-gallon difference translates to roughly 180–300 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.
Are the Monterey 258 SS 2019 and Monterey M4 2020 from the same manufacturer?
Yes — both the Monterey 258 SS 2019 and the Monterey M4 2020 are built by Monterey. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.