The Serra do Rio do Rastro is a mountain range in the southeast of Santa Catarina, southern Brazil, and the road that crosses it — the SC-390 between Lauro Müller and Bom Jardim da Serra — is the country's best-known motorcycling climb. It is the principal mountain pass linking the Santa Catarina coast with the interior plateau, it climbs to a range high point of 1,460 m (4,790 ft), and on clear days you can see the Atlantic Ocean roughly 100 km (62 miles) away from the top. Brazilian travel media consistently describe the climb as 284 bends over about 12 km. This guide covers what that means on a bike, the fog and frost that define the season, and how to plan around them.
The ride in one paragraph
The escarpment runs between the municipalities of Lauro Müller on the coastal side and Bom Jardim da Serra on the plateau. The range's highest point is 1,460 m (4,790 ft), and the main viewpoint at the top of the climb sits above 1,421 m; a short distance south of the road, at Morro da Ronda near the southeastern descent, the ground reaches 1,507 m. Looking north-northwest from up there you can pick out Morro da Igreja at 1,822 m, one of the three highest points in Santa Catarina; looking south on a clear day you can see Monte Negro in Rio Grande do Sul at 1,398 m. The road was built in the 1950s and its character is exactly what the numbers suggest: steep gradients, tight bends stacked on top of each other, deep cliffs on the outside, and a line of kiosks and viewpoints at the top where everyone stops.
Route at a glance
| Road | SC-390, Lauro Müller to Bom Jardim da Serra, Santa Catarina, Brazil |
| Bends | Commonly cited by Brazilian travel media as 284 over roughly 11 to 12 km |
| Range high point | 1,460 m (4,790 ft); main viewpoint above 1,421 m |
| Nearby high ground | Morro da Ronda 1,507 m, near the southeastern descent; Morro da Igreja 1,822 m to the north-northwest |
| Ocean view | The Atlantic, about 100 km (62 miles) away, is visible from the top on clear days |
| Built | 1950s; the principal pass between the Santa Catarina coast and the plateau |
| Winter conditions | Frosts are common at the top and snow can fall in the highest areas |
Open the climb in Google Maps — Lauro Müller up through the Serra to Bom Jardim da Serra, ready to send to your navigation.
Climbing from Lauro Müller
The eastern approach is the one to do first. From the coastal plain the road runs through the Guatá district and up into dense Atlantic forest, gaining height gradually at first while the escarpment ahead stays hidden. Then the wall resolves into a series of ramps folded back on themselves, and the serious climbing starts.
What the bend count does not convey is how tightly the bends are packed. Over roughly a dozen kilometres you are almost never straight, the radii are small enough that a heavily loaded touring bike will be working at full lock on some hairpins, and the gradient is continuous. The outside of many bends drops away without much between you and the drop. The surface is generally good, but it stays damp under the rock faces where water seeps across, and the vegetation overhanging the road keeps sections in permanent shade.
The forest itself is a genuine attraction. The climb passes through dense ombrophilous Atlantic forest with distinct altitudinal bands, transitioning near the top into cloud forest and then into open grassland; on the plateau side the vegetation changes again into araucaria forest mixed with southern grassland in a mosaic. The range is also of geological significance as part of the Coluna White stratigraphic sequence from the ancient supercontinent of Gondwana, and is classified as a Brazilian geological site.
The top, and the run down to Bom Jardim da Serra
The viewpoint at the top of the climb is the postcard: a panorama back down over the stacked bends and out across the coastal plain, with the Atlantic visible about 100 km away when the air is clear. There are kiosks along the road here and it is the natural place to stop. It is also, on a weekend in good weather, extremely busy — this is one of Santa Catarina's signature attractions and the road fills with cars, bikes and coaches.
From the top the road continues to Bom Jardim da Serra on the plateau, where the character changes completely: open, rolling, high grassland with araucaria pines, and long views. The SC-390 continues northwest towards São Joaquim, and the state's Serramar project links it with the SC-110 and SC-114 to form a longer touring route from Lages through São Joaquim and Bom Jardim da Serra down to the coast at Tubarão. Riding the plateau and the descent together makes a much better day than treating the switchbacks as a standalone attraction.
Descending towards Lauro Müller is the harder direction. Sustained gradient plus tight radii plus oncoming traffic in your lane on the hairpins is a combination that punishes riders who use the brakes exclusively. Low gear and engine braking, and a deliberate habit of looking through the bend rather than at the edge, are what this descent asks for.
Fog, frost and the southern-hemisphere season
Brazil is in the southern hemisphere, so winter runs from June to August and summer from December to February. Both ends of the year present a different problem on this road.
Winter. Frosts are common in the highest areas and snow can fall there — a genuine rarity in Brazil and one of the reasons the plateau towns market themselves as winter destinations. Frost on a shaded hairpin at 1,400 m is exactly as dangerous as it sounds, and the road can be closed or restricted when conditions warrant. Winter also brings the clearest air and the best chance of actually seeing the ocean from the top.
Fog. This is the constant. The escarpment is where warm coastal air meets the plateau, and cloud sits on the upper bends regularly throughout the year, sometimes reducing visibility to a few metres within a single hairpin. There is no seasonal escape from it; there is only checking conditions before you commit and being willing to turn round.
Summer. Warmer and wetter, with heavy rain and the risk of material coming off the cuttings onto the road. The forest keeps the surface damp for a long time after rain stops.
Verified in August 2026: check the state road authority's current status and local reports for Santa Catarina before riding, since the SC-390 can be affected by weather, landslides and roadworks at short notice. Weekday mornings are the quietest time on the climb by a wide margin.
Fuel, tolls and paperwork
Fuel. This is one of the easier parts of South America for fuel. Southern Brazil has a dense network of stations, and Lauro Müller, Bom Jardim da Serra, São Joaquim, Orleans and Tubarão all have them. There is nothing on the climb itself, but the climb is only a dozen kilometres, so the practical rule is simply to fill in one of the towns before you start rather than plan to do it at the top. Brazilian pumps sell both petrol and hydrous ethanol; ethanol is not suitable for most imported motorcycles unless the manufacturer explicitly permits it, so check the pump label rather than assuming, and use the standard or additive-enhanced petrol grades.
Tolls. Brazilian highways in the south include toll roads, particularly on the BR-101 coastal corridor that most riders use to reach the area. Toll plazas and electronic tags exist and rates change, so check current arrangements for motorcycles with the concession operator rather than assuming a rate — and do not assume that motorcycles are exempt unless the operator states it.
Paperwork. For Brazil, carry your passport, home licence with an International Driving Permit, the vehicle registration or title, the temporary import document issued at the border, and insurance valid in the country. If you are entering from Argentina or Uruguay, the crossings in the south are straightforward but the vehicle paperwork is checked properly. Hired bikes need written authorisation from the rental company to cross any border.
Gear notes for the Serra do Rio do Rastro
The problem on this road is visibility, not distance. Cloud can close the upper bends in minutes, and the decision you need to make — carry on or turn around — is easier when you know exactly what is above you and what the alternatives are. Having the region loaded for offline route planning means the plateau alternatives are already stored rather than searched for on a wet hairpin. A purpose-built riding system screen stays readable in the drizzle that hangs on the escarpment, and our piece on screens versus phone mounts is relevant on a road with 284 bends of vibration. A dozen kilometres of continuous tight bends works front tyres hard and heats them unevenly, which is exactly the situation our tyre pressure guide and a TPMS sensor are for — you want to know about a pressure change before the descent, not after it. Frost at the top and warm air at the bottom is a big swing in a short distance, so our notes on cold-weather pressure drops apply here despite the latitude. Run through the pre-ride check with the brakes in mind before a day of this. For the wider continent, see the best motorcycle roads in South America page, and our Ruta 40 guide if you are heading west.
FAQ
How many curves does the Serra do Rio do Rastro have?
Brazilian travel media consistently cite 284 bends over roughly 11 to 12 km between Lauro Müller and Bom Jardim da Serra. That figure is widely repeated rather than published by the state road authority, so treat it as the accepted count rather than an official survey. What is not in dispute is the density — the road is almost never straight.
How high does the road go?
The range's highest point is 1,460 m (4,790 ft) and the main viewpoint sits above 1,421 m. Nearby, Morro da Ronda near the southeastern descent reaches 1,507 m, and Morro da Igreja to the north-northwest is 1,822 m.
Can you see the ocean from the top?
Yes, on clear days. The Atlantic lies about 100 km (62 miles) away and is visible from the highest areas when the air is clear — which is most likely in winter, when it is also coldest.
Does it snow there?
Frosts are common in the highest areas and snowfall can occur, which is unusual for Brazil and part of why the plateau towns attract winter visitors. Frost on shaded hairpins is a serious hazard for motorcyclists, so check conditions before riding in the June to August winter.
When is the best time to ride it?
Weekday mornings in any season, to avoid the weekend traffic that fills the viewpoints. Seasonally, winter gives the clearest air and the best long views at the cost of frost risk; summer is warmer but wetter with more landslide debris. Fog can close the upper bends at any time of year.
