The Devil's Backbone is Ranch Road 32, a 23.23-mile two-lane between US 281 south of Blanco and RM 12 in Wimberley, and its middle section runs along the crest of a limestone ridge with the ground dropping away on both sides. It is the closest genuinely scenic road to Austin and San Antonio — under an hour from either — which makes it the standard evening ride and the standard Sunday traffic jam. Ride it early, link it with RM 12 and RM 165 for a ninety-mile loop, and treat the ridge section as a viewing road rather than a fast one.
What the road is
RM 32 is a Ranch to Market road in Blanco, Comal and Hays counties. TxDOT's designation file puts it at 23.23 certified miles, running from a junction with US 281 south of Blanco southeastward to RM 12 northwest of San Marcos, in Wimberley. It was designated in 1942 to replace State Highway 232, which had itself been laid out in 1936 — this is an old alignment, and it shows in the way the road follows the ridge line instead of cutting through it.
The ridge itself is a piece of the Balcones fault country. The Edwards Plateau breaks down toward the coastal plain along a fault zone that runs in a curve across Texas from Del Rio to the Red River, standing about 300 feet high between San Antonio and Austin, and RM 32 rides one of the fingers of limestone left standing at the edge of it. That is why the elevation numbers look unimpressive on paper and the views do not: you are not high, you are narrow, with valleys cut in on both sides at once.
The name applies to the middle. West of Fischer the road climbs onto a narrow limestone spine, and for several miles you can see across two valleys at once. That is the postcard, and it is also the section where every car on the road is going slower than you expected and looking sideways rather than forward.
Route at a glance
| Item | Detail |
|---|---|
| Length | 23.23 certified miles (37.4 km), per TxDOT |
| Ends | US 281 south of Blanco, east through Fischer to RM 12 in Wimberley |
| Counties | Blanco, Comal, Hays |
| Terrain | Limestone ridge crest with valleys either side; rolling approaches |
| Loop version | Wimberley to Blanco on RM 32, north on US 281, RM 165 to US 290, RM 12 south — roughly 90 miles |
| Base towns | Wimberley, Blanco, Fischer, San Marcos, Dripping Springs |
| Best time | Weekday mornings; March to May and October to November for weather |
Open the Wimberley to Blanco run in Google Maps — the full length of RM 32 through Fischer, ready to send to your navigation before you leave.
Riding it west to east, or east to west
Both directions work, and they are different rides.
West to east, Blanco to Wimberley. You leave US 281 into rolling ranch country, climb onto the ridge with the long views arriving gradually, then descend through Fischer and into the cedar and creek country above Wimberley. This is the version to ride in the morning, with the sun behind you on the ridge and Wimberley open for lunch at the far end.
East to west, Wimberley to Blanco. The climb out of the Blanco River side is more abrupt, and the ridge arrives as a sudden opening-out rather than a build. In the evening it puts the light in front of you across the valleys, which is the reason locals ride it that way after work, and also the reason the glare into a low sun on a ridge with oncoming traffic deserves respect.
Fischer is the middle marker — a crossroads community where FM 3424 ends on RM 32, with the Devil's Backbone Tavern beside the road. It is the one obvious place to stop on the whole route.
Making a day of it
Twenty-three miles is an hour, not a day. The loop that turns it into a proper ride uses two more Ranch to Market roads with their own TxDOT mileages:
From Wimberley, run RM 32 west to US 281, north into Blanco, then northeast on RM 165 — 15.722 certified miles from Blanco to US 290 near Henly — and east on US 290 to Dripping Springs. Come back south on RM 12, a 37.275-mile designation that runs San Marcos through Wimberley to Dripping Springs, and you close the loop where you started. Call it ninety miles of almost entirely two-lane with three towns on it.
Worthwhile stops that do not wreck the schedule: Blanco State Park sits on the river right in town and is a five-minute detour for shade and water, and Old Baldy above Wimberley is a short, steep set of steps to a view over the Blanco valley if your boots are up to it. If you have a longer day, the ridge links naturally into the full Hill Country day loop from Austin, which uses RM 32 as its homeward leg.
The things that catch people out
Traffic, not corners. This road is twenty minutes from two metro areas. Weekend afternoons bring cars, cyclists, tourists looking for the view and the occasional car stopped in a lane at a pull-off. The riding hazard on the Devil's Backbone is almost never the road — it is a vehicle doing something unexpected on a ridge with no shoulder.
Deer, and the tree line. The approaches are cedar and oak right up to the pavement edge, which means an animal and the road arrive at the same instant. Dawn and dusk are the worst windows and they are also, annoyingly, the best light. Slow down for the tree-lined sections and accept the trade.
Heat. The ridge tops out well under 2,000 feet, so summer here has no altitude escape. The National Weather Service's heat safety guidance is the sensible baseline: hydrate before you need it, take breaks before you want them, and shift the ride to the morning. From June to September this is a sunrise road.
Water. Hill Country creeks cross these roads at grade and the region floods fast. After rain, check TxDOT's DriveTexas conditions map and do not ride into moving water of unknown depth — the Blanco and the Pedernales both have a history of going from placid to dangerous within minutes.
Enforcement. The road is posted well below what it looks like it will take, and the towns at each end enforce their limits. Wimberley in particular is a small-town speed-limit drop with tourists everywhere on weekends.
Gear notes for a short ridge road
The specific issue on RM 32 is that it is a stop-start ride in the busy hours — ridge, pull-off, town, ridge — and the interesting bits are exactly where you least want to be looking down at a phone. Loading the loop before you leave and reading it off a handlebar riding system display keeps your eyes on the crest, and it means the RM 165 and RM 12 junctions do not turn into a roadside map check. The JADO S6 also keeps front and rear cameras rolling, which is worth having on a road where the risk is other traffic behaving unpredictably. The second thing is heat and tire pressure: Texas asphalt runs far hotter than the air on a summer afternoon, and pressure climbs with it — our tire pressure guide covers how much, and a valve-cap TPMS sensor shows the change while you ride.
FAQ
How long is the Devil's Backbone drive?
RM 32 is 23.23 certified miles end to end, per TxDOT — about half an hour of moving time. Most riders link it with RM 12 and RM 165 into a loop of roughly ninety miles to make a half-day out of it.
Where does the Devil's Backbone start and end?
It runs from US 281 south of Blanco east through Fischer to RM 12 in Wimberley, crossing Blanco, Comal and Hays counties. The ridge section that gives the road its name is in the middle, around Fischer.
Is it a technical motorcycle road?
No. It is a scenic ridge road with rolling approaches and reasonable sight lines, not a canyon road. For sustained switchbacks in Texas you want the Twisted Sisters west of Leakey, which is a weekend rather than an evening.
When is the best time to ride the Devil's Backbone?
Weekday mornings, March to May or October to November. Weekend afternoons in spring bring the heaviest traffic of the year, and summer afternoons are a heat problem rather than a riding one.
What else is worth riding nearby?
The Willow City Loop northeast of Fredericksburg in spring, and the wider set of roads in our Texas roads overview, which covers the Hill Country and West Texas options in one place.
