The Southerly 57 2020 vs Southerly 580 2024 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 — Southerly 57 2020 at 58,2 ft versus Southerly 580 2024 at 58,1 ft. Weight tells a clearer story for trailering families: the Southerly 57 2020 tips the scales at 76 639 lbs — 23 729 lbs more than the Southerly 580 2024 at 52 910 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.

Both boats share a closely matched power ceiling — 146 hp for the Southerly 57 2020 and 140 hp for the Southerly 580 2024. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads — 368 gal and 367 gal — so range won't be a tiebreaker here.

Both boats are rated for 17 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.

Displacement is where these two sailboats genuinely part ways. The Southerly 57 2020 displaces 76 639 lbs — a 23 729-lb difference over the Southerly 580 2024 at 52 910 lbs. That gap separates two entirely different categories of sailing: the heavier boat is built for offshore passage-making and load-carrying, while the lighter hull rewards performance sailing and easier handling in lighter air.

Draft is a practical consideration that many buyers underestimate until they're already at the marina. The Southerly 57 2020 draws 10,8 ft, compared to 3,6 ft for the Southerly 580 2024. That 7,2-foot difference affects which anchorages you can access, which haul-out facilities will take you, and how carefully you need to read the tide tables in shallower cruising grounds.

The Southerly 57 2020 uses Sloop rigging. For auxiliary power the Southerly 57 2020 carries a 146-hp engine against 140 hp on the Southerly 580 2024. Motoring range and ability to punch through a foul current or enter a tight marina under power will favour the more powerful installation.

For extended cruising, water capacity matters: the Southerly 57 2020 carries 275 gallons versus 106 gallons on the Southerly 580 2024 — a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.