Davis Mountains Fort Davis to McDonald Observatory High Route
Sky island traverse to Texas' astronomical crown
The Fort Davis to McDonald Observatory High Route climbs through the Davis Mountains along old ranch roads and forest service tracks that connect the historic frontier outpost with one of the world’s premier astronomical research facilities. Starting at 5,050 feet in Fort Davis, the route spirals up through juniper and oak woodlands, crossing Miller Creek and climbing toward Mount Locke’s 6,791-foot summit where the Hobby-Eberly Telescope dominates the skyline. The technical challenge comes at Sawtooth Mountain gap, where loose volcanic rock and steep grades test both vehicle and driver.
High-clearance 4WD essential for the rocky sections above 6,000 feet, though stock vehicles can manage the lower elevations in dry conditions. Best attempted April through October when mountain weather stays predictable and observatory road access remains open. The route offers exceptional stargazing opportunities at designated pull-offs, though light discipline is mandatory near the observatory. Water and fuel available in Fort Davis, but nothing exists on the mountain. The payoff includes some of Texas’ most dramatic mountain vistas and potential mountain lion encounters in the higher elevations.
Trail Specs
| Difficulty | Moderate |
|---|---|
| Trail Type | High Clearance |
| Surface | Mixed |
| Features | High Altitude, Historic, Scenic |
| Length (miles) | 24 mi / 38.6 km |
| Duration | 1-2 days |
| Max elevation (ft) | 6791 ft |
| Best season | April-October |
| Minimum vehicle | Stock 4WD high-clearance |
| Nearest town | Fort Davis, Texas |
| Land manager | Texas Parks and Wildlife Department |
| Permit required | No |
| Cell service | Spotty |
| Water crossings | Yes |
| Dispersed camping | Yes |
| Official sources | tpwd.texas.gov |
| Start coordinates | |
| End coordinates | |
| Copy both for Google Maps directionsClick to copy the directions URL · or open it directly in a new tab | |
| Find on Google | Search on Google → |
Location
Trail Conditions
No recent condition reports. Be the first to post one.
Log in to post a condition report.
Frequently asked questions
Can a stock 4Runner or Wrangler handle this trail without modifications?
Yes — the trail is rated for stock 4WD high-clearance vehicles. A bone-stock 4Runner, Wrangler, or similar rig will manage the mixed surface and elevation without issue, but low-profile crossovers and 2WD trucks should stay home.
When does snow or ice make this trail impassable?
November through March can bring snow and ice above 6,000 feet, which turns the caliche and dirt sections treacherous. The best window is April through October; summer monsoons (July–August) can make sections briefly muddy but generally passable same-day.
Do I need a permit to drive this route or camp along it?
Davis Mountains State Park requires a daily entrance fee (Texas State Parks Pass accepted). Dispersed camping outside park boundaries falls under standard public land rules — no permit required, but follow leave-no-trace and fire restriction postings, which change seasonally.
What's the hardest section on this route and what makes it technical?
The steeper switchback climbs approaching the upper elevations near McDonald Observatory are where it gets honest — loose rock, off-camber surfaces, and limited room to recover if you drift a line. Nothing requires lockers, but sloppy driving will punish you.
Is there any reliable water or fuel along the route, or do I need to plan for a dry 24-mile run?
Fuel up in Fort Davis before you leave — there are no services on the route itself. Water crossings exist but are not potable sources you should count on; carry all drinking water from town. Cell service is spotty to nonexistent for most of the traverse, so file a trip plan before you roll.
Trail track
No GPX track for this trail yet. If you've driven it and have a track, contribute below.
Log in to contribute a GPX track.